29 results about "Magneto-optic effect" patented technology

The invention discloses an optical neural network non-linear activation system, method and device, and relates to the technical field of optical neural networks, because a magneto-optical material is integrated in a phase adjustment waveguide arm of a non-linear activation unit, a controller can adjust the current activation function type and weight of the optical neural network according to the current activation function type and weight of the optical neural network. And controlling a magneto-optical material of the phase adjustment waveguide arm to generate a magneto-optical effect so as to perform phase adjustment on an optical signal transmitted through the phase adjustment waveguide arm, so that the nonlinear activation unit can adapt to the type and weight of a current activation function, and perform corresponding nonlinear calculation on a target input signal to obtain a target input signal. Dynamic switching of various nonlinear activation functions is realized, and the flexibility of the optical neural network is improved.

The application discloses an optical neural network nonlinear activation system, method and device, relates to the technical field of optical neural networks, and because a magneto-optical material is integrated in a phase adjustment waveguide arm of a nonlinear activation unit, a controller can control the magneto-optical material of the phase adjustment waveguide arm to generate a magneto-optical effect according to a current activation function type and weights of the optical neural network, so as to perform phase adjustment on an optical signal transmitted through the phase adjustment waveguide arm, and make the nonlinear activation unit adapt to the current activation function type and the weights, perform corresponding nonlinear calculation on a target input signal, and realize dynamic switching of multiple nonlinear activation functions, thereby improving the flexibility of the optical neural network.

The invention belongs to the field of terahertz, relates to a magneto-optical material in a one-way transmission device (such as an isolator and the like), and particularly provides a terahertz magneto-optical material with a step-type microstructure anti-reflection layer. The objective of the invention is to solve the problems of low transmissivity, high emissivity, low forward transmission efficiency and the like caused by too large thickness of an existing magneto-optical material (La: YIG thick film) when a strong magneto-optical effect is realized. The anti-reflection layer based on the step type microstructure is creatively provided and arranged on the upper surface of the magneto-optical material layer, so that the anti-reflection and anti-reflection effects on terahertz waves are achieved, the forward transmission efficiency of the magneto-optical material is remarkably improved, and the application requirements of non-reciprocal one-way transmission devices (such as isolators and the like) of the terahertz frequency band are met.

The invention discloses a magneto-optical effect-based dynamic zooming method and an optical system, and the method comprises the steps: arranging at least one magneto-optical crystal between a pre-amplifier and a main amplifier, so as to achieve the dynamic zooming through the magneto-optical effect; wherein the magneto-optical crystal is obtained by combining anisotropic materials with matched refractive indexes, and the anisotropic materials are processed into complementary parabola shapes. According to the invention, the magneto-optic effect is utilized to realize dynamic zooming, and the mode of complementary combination of the crystals with matched refractive indexes is utilized to solve the problem that the additional wavefront shape does not conform to the demand. Compared with an electro-optical effect scheme, an applied magnetic field is a uniform magnetic field along a transmission direction, so that a depolarization problem caused by a transverse component is avoided; compared with the scheme of aperture division, grating division and the like, the dynamic zooming can be realized on the premise of not influencing the output capability of the laser.

The application discloses a temperature measuring method and device based on a Faraday magneto-optical effect of magnetic nanoparticles, and belongs to the technical field of nano material testing. The method comprises the following steps: placing a magnetic nanoparticle sample in a target area, and making the magnetic nanoparticles generate a magnetization response through an applied direct current excitation magnetic field; adopting a polarized light to irradiate the magnetic nanoparticles in the coaxial direction of the magnetic field, so that the Faraday magneto-optical effect occurs between the magnetic nanoparticles and the sample; taking a sample without adding magnetic nanoparticles as a control group, applying an excitation magnetic field with the same amplitude and opposite direction to the applied direct current excitation magnetic field to the sample, and detecting the emergent light; calculating the Faraday rotation angle generated by the magnetic nanoparticles according to the detected emergent light; and performing nonlinear fitting on the Faraday rotation angle generated by the magnetic nanoparticles and the applied direct current excitation magnetic field by using a Lenz function, so as to obtain the temperature of the magnetic nanoparticles in the target area. The application can realize remote and non-invasive in-vivo temperature measurement.

The invention discloses a double-pavement light source light intensity magnetic control tuner which comprises a first electromagnet set (1), a second electromagnet set (2), a two-dimensional magnetofluid cavity (3), an X-axis light source (4), an X-axis light intensity decision device (5), a Y-axis light source (6) and a Y-axis light intensity decision device (7). The tuner controls the light intensity transmissivity of light beams transmitted along the magnetic field direction by adjusting the magnetic field intensities of the electromagnet group I and the electromagnet group II based on the magneto-optical effect of the magnetic fluid, and judges that the light path is in an on state when the transmitted light intensity reaches a set threshold value, otherwise, the light path is in an off state, so that independent on-off control of the two light paths is realized. The device has the characteristics of strong environmental adaptability and excellent light noise interference resistance, is suitable for the technical field of optical communication and optical sensing, and can improve the accuracy and stability of optical path switching.

According to the scheme, the all-fiber mechanical vibration sensor which is based on the magneto-optical effect and senses vibration motion through the optical technology is provided, the modern optical fiber technology and the optical interferometer principle are utilized, optical fibers are adopted as sensing materials and optical transmission materials, and sensing of mechanical vibration to be detected is achieved through light beams in the optical fibers. Sensing parts do not contain devices which are susceptible to external electromagnetic interference and damage the insulation degree, such as conductive wires, and optical sensing vibration information can be accurately and safely completed in a passive, non-contact and loss-free manner at a high speed. The optical fiber sensing device has the advantages of simple optical fiber sensing structure, small size, high reliability, high response speed, wide signal frequency band, high safety and the like. The all-fiber mechanical vibration sensor can be used for sensing and monitoring vibration states and vibration characteristics of various rotating machines, and can also be used for optically sensing and monitoring vibration states of non-rotating machines, so that the mechanical equipment can realize intelligent and safe operation.

The invention relates to a high-speed light exchanger based on a magneto-optical effect. The high-speed light exchanger comprises an optical kernel unit, the optical core unit comprises a first polarization splitting prism, a wave plate, an optical rotation assembly and a second polarization splitting prism which are arranged along the direction of an optical path; the plurality of optical core units are connected in a net shape to form an optical exchanger; an output port of an input signal can be changed by changing the electrifying direction of the magnetic element; signal light input by the first input port can be output from the first output port or the second output port; the optical switch is formed by connecting a plurality of optical core units in a net shape, unobstructed switching from any input N port to any output N port of optical signals can be achieved, and due to the fact that output of different ports is changed at the same time by means of the power-on direction of the magnetic element array, switching time can be minimized; and the switching time (response speed) can reach within 10 [mu] S at the highest speed.

The invention discloses an interactive dynamic appearance assembly structure, a forming method and a packaging box, the interactive dynamic appearance assembly structure structurally comprises a light-emitting module, a power supply module and a magnetic change module, the light-emitting module is electrically connected with the power supply module, and the magnetic change module is arranged on the upper layer of the light-emitting module; the light-emitting module comprises a base material layer, and a first conductive layer, a first protective layer, a light-emitting layer, a second conductive layer and a second protective layer are arranged on the base material layer from inside to outside. The magnetic change module is arranged on the outer layer of the protective layer II and comprises a magnetic particle colloid layer and a protective layer III which are arranged from inside to outside; when a circuit of the assembly structure is not connected, a mobile phone and other magnetic devices approach to trigger the magneto-optical effect of the magnetic particle colloid layer, and local dynamic color changing of the package is achieved; after the circuit is connected, the pattern of the electroluminescent layer is displayed through the colloid layer, the spiral coil is electrified to generate a magnetic field to rearrange the magnetic particles to form a new magneto-optic effect, and the interactive experience and the visual attraction are improved.

The invention provides a magnetic domain imaging method based on a magneto-optical effect, and the method comprises the steps: respectively obtaining a first magnetic domain image and a second magnetic domain image when a polarization adjustment device carries out the polarization adjustment of detection light, and further carrying out the processing including difference calculation, so as to obtain a third magnetic domain image, thereby improving the contrast ratio of the magnetic domain images, and improving the imaging precision. The detection effect is improved; the invention further provides a magnetic domain imaging device based on the magneto-optical effect and a magnetic domain imaging method based on the magneto-optical effect.

The invention discloses a chiral light transverse spin separation method based on frequency regulation of magneto-optical super atoms, and belongs to the field of micro-nano photonics. Carrying out transverse spin separation by adopting a magneto-optical super-atom structure; the magneto-optical super-atom structure comprises an upper magnetic metal material layer, a lower magnetic metal material layer and a middle magneto-optical material layer, a rectangular coordinate system is established based on a magneto-optical super-atom structure, left-hand circularly polarized light and right-hand circularly polarized light are incident in the-y-axis direction, magnetic metal materials on the upper layer and the lower layer apply a static magnetic field to a magneto-optical material on the middle layer in the z-axis direction of the structure, and the magneto-optical effect of the magneto-optical material on the middle layer is excited. And electric and magnetic dipole moments are generated to generate scattering transverse spin separation on the incident left-hand circularly polarized light and right-hand circularly polarized light. The method breaks through traditional fixed frequency limitation, dynamic reversible regulation and control of the separation direction and amplitude are achieved, and forward separation, complete suppression and reverse separation can be continuously switched by adjusting the incident light frequency.

The invention provides a super-resolution magneto-optical detection focusing method, which comprises a detection assembly and a sample bearing assembly, the detection assembly is configured to perform magnetic detection of a detected object by using a light beam through a magneto-optical effect, and the light beam of the detection assembly is converged at a preset position. A diaphragm conjugated with a preset position is arranged in a light path where the light sensor is located, and a signal of the light sensor responds to the light intensity of incident light; according to the relative positions of the at least two groups of detection assemblies and the detected object and the signal of the light sensor, the relative position when the light intensity of the incident light sensor is maximum is obtained as the target position, and the relative position is adjusted to the target position, so that super-resolution focusing and magnetic detection of the detected object are realized, the detection noise is reduced, and the detection resolution is improved. The invention further provides a super-resolution magneto-optical detection device.

The application provides an all-fiber current sensor based on S wave plate linear measurement, which is based on Sagnac effect, Faraday magneto-optic effect and S wave plate; linearly polarized light is obtained through a polarizer, and the linearly polarized light is divided into two mutually orthogonal linearly polarized lights through a delay line and a 45-degree fusion splicing point; the linearly polarized light is modulated by a modulator, and then enters a λ / 4 wave plate and is converted into left-handed and right-handed circularly polarized light; after entering a sensing optical fiber, the measured circuit current magneto-optic effect makes the two circularly polarized lights produce a phase difference; the phase difference is doubled through a fiber end mirror and a sensing optical fiber, and the linearly polarized light is combined into linearly polarized light through a λ / 4 wave plate, a modulator and a 45-degree fusion splicing point; the phase difference of the circularly polarized light is converted into the rotation of the linearly polarized light polarization plane; the linearly polarized light after the secondary modulation passes through an S wave plate and a polarizer in turn, and the rotation of the polarization plane is converted into the synchronous translation of the light spot; the phase difference and the current value are obtained by positioning the light spot through an image sensor; the application has the advantages of optical power independence and linear birefringence complete compensation.

The application discloses a fiber current transformer constituted by a laser resonant cavity, relates to a current detection technical field, and particularly relates to a fiber current transformer in a high-voltage transmission line, which utilizes fiber sensing technology to rapidly detect the current in a wire and is suitable for real-time detection of the current in a high-voltage line; the fiber current transformer comprises a 980nm pumping source, a wavelength division multiplexer, an erbium-doped optical fiber, a 1 / 4 wave plate, a 1550nm Faraday magneto-optic effect optical fiber coil, a mirror, a 1550nm fiber grating, a photoelectric detector and a spectrum analyzer; and has the advantages of high sensitivity, high resolution, fast inquiry speed, no phase deviation and no sine response.

The application provides a linear measurement all-fiber current sensor, linearly polarized light is obtained through a polarizer, and is divided into two mutually orthogonal linearly polarized lights, and is further converted into left-handed and right-handed circularly polarized light to input a sensing optical fiber, a Faraday magneto-optic effect of current is used to make the two circularly polarized lights have a phase difference, the circularly polarized light is reflected by a mirror at the end of the sensing optical fiber, and then the phase difference is doubled through the sensing optical fiber, and the circularly polarized light is combined into a linearly polarized light through a λ / 4 wave plate, a modulator secondary phase modulation and a 45° fusion splice point, meanwhile, the phase difference of the circularly polarized light is converted into the rotation of the linearly polarized light polarization plane, and the rotation of the linearly polarized light polarization plane is converted into the synchronous translation of a light spot through a coupler, a beam expander and a radial polarization grating, and the phase difference is obtained by positioning the light spot through an image sensor; the application realizes linear demodulation of a Faraday magneto-optic rotation angle, has the advantages of being irrelevant to the measurement result and optical power, being beneficial to the separation compensation of linear birefringence, realizing non-distortion harmonic measurement and the like.

According to the OPGW optical cable and the optical transmission system, a light guide medium is replaced with an anti-resonance hollow-core optical fiber, and the physical characteristic that the optical power transmitted in an air core is larger than or equal to 97.3% is utilized, so that a thermal deformation path of a solid material is thoroughly avoided; a traditional solid core optical fiber may generate violent expansion due to a metal ion doped vortex enhancement structure, and radial extrusion is formed on a fiber core; a light guide mechanism of the HC-ARF does not need to depend on a solid medium, and conduction of heat energy from a conductive layer to a fiber core is blocked, so that the problem of waveguide structure deformation caused by thermal expansion mismatch is solved; on the basis of an air light guide mechanism of the HC-ARF, energy coupling between an electromagnetic field and a medium is cut off from a physical level, a Faraday magneto-optical effect and a Kerr electro-optical effect caused by a lightning transient strong electromagnetic field need to act on a solid medium, the HC-ARF enables light waves to be transmitted in air, an acting carrier of the magneto-optical / electro-optical effect is eliminated, refractive index tensor distortion is fundamentally avoided, and the refractive index tensor distortion is reduced. And the polarization stability is ensured.

The invention discloses a terahertz wave polarization modulation encryption method based on a Faraday optical rotation effect, and the method comprises the steps: transmitting an initial signal by a transmitting end through a terahertz laser signal source; generating a continuously deflected modulation signal after passing through an yttrium iron garnet sheet with a variable magnetic field applied in the encryption device, and spreading the modulation signal to the space; after the receiving end receives the control secret key, the decryption device is controlled to change a magnetic field at the same frequency, the encrypted modulation signal subjected to space propagation passes through the yttrium iron garnet sheet in the decryption device, then the deflection angle of the encrypted modulation signal is restored, and then the encrypted modulation signal passes through the polarization analyzer and is received by the signal detector. The yttrium iron garnet material is innovatively used in the terahertz wave band, continuous and real-time magnetic polarization modulation is carried out through the magneto-optical effect, the device is simple in structure, no complex mechanical structure exists, compared with mechanical polarization modulation, more flexibility is achieved, and meanwhile abrasion of mechanical modulation and time delay of a transmission device are avoided.

This invention discloses a low-cost, easily formable silicon-based epitaxial magneto-optical thin film, its preparation method, and its applications. The method employs an in-situ co-creation technique to uniformly disperse ZnFe₂O₄ nanoparticles, which exhibit strong magneto-optical effects but are prone to aggregation, within ZIF-8 with fixed pores. PgC₅Cu is used as a bridging agent to modify the surface of ZIF-8. The ZIF-8 is then uniformly dispersed in a UV-curing adhesive to form a solution, which is then uniformly coated onto a silicon substrate. After UV curing, a silicon-based epitaxial thin film material with excellent magneto-optical properties is successfully constructed. The preparation method of this invention is relatively simple and highly operable. The resulting thin film material exhibits outstanding magneto-optical properties and shows good application potential in various fields such as magneto-optical storage, magneto-optical sensors, optoelectronic integration, and micro / nano optical devices. This provides a highly valuable new material for magneto-optical thin film research and device development.

The III-nitride semiconductor laser comprises a substrate, a lower limiting layer, a lower waveguide layer, an active layer, an upper waveguide layer, an electron blocking layer and an upper limiting layer which are sequentially arranged from bottom to top. A non-reciprocal topology laser oscillation layer is arranged between an upper limiting layer and an electron blocking layer of the semiconductor laser. Specific conduction band effective state density distribution, dielectric constant distribution and peak rate electric field distribution of the nonreciprocal topology laser oscillation layer, a photonic structure formed by interfaces of the upper limiting layer, the upper waveguide layer and / or the lower limiting layer and the lower waveguide layer, and a one-way photonic band gap edge state between specific topology invariants; the magneto-optical effect is regulated and controlled through a non-diagonal dielectric tensor to enhance nonreciprocity, circularly polarized light propagating in the chiral displacement direction obtains different phases and attenuation, stimulated radiation laser of an active layer is regulated and controlled to be coupled to a specific waveguide to be output, internal optical loss is restrained, the mode gain of a laser element is improved, and the optical power and slope efficiency of the laser element are improved.

This invention relates to a magnetic domain structure (100), which has a multilayer film composed of alternatingly stacked dielectric layers (41) and magnetic insulator layers (43) on a supporting substrate (10). The supporting substrate (10), dielectric layers (41), and magnetic insulator layers (43) are all made of a material with a garnet structure. A first multilayer film (20) is formed on the supporting substrate (10), which is composed of alternatingly stacked dielectric layers (41) and magnetic insulator layers (43), and has a structure formed on the supporting substrate (10). A defect layer (30) is formed on a first multilayer film (20), the defect layer (30) being composed of a magnetic insulating layer (43) thicker than one layer of the magnetic insulating layer (43) in the first multilayer film (20). A second multilayer film (40) is formed on the defect layer (30), the second multilayer film (40) being composed of alternating layers of multiple dielectric layers (41) and multiple magnetic insulating layers (43). In a magnetic field-free environment, magnetic domains with a width of more than 200 nm are exhibited with magnetization oriented perpendicular to the surface of the supporting substrate. Thus, a magnetic domain structure is provided that exhibits magnetic domains of a size equivalent to the wavelength of light used, while having high transmittance and a large magneto-optical effect.

The application discloses a high-sensitivity special-shaped core magnetic sensitive optical fiber and belongs to the technical field of optical fibers. The special-shaped core magnetic sensitive optical fiber comprises a cladding and a special-shaped core embedded in the cladding. The cross section of the special-shaped core is a chord-shaped structure composed of a circular arc and a chord, and the radian of the circular arc is greater than pi. The cladding is an air layer except the special-shaped core. The material of the special-shaped core is a rare earth metal element terbium doped magneto-optical glass. The special-shaped core magnetic sensitive optical fiber can generate a significant non-reciprocal magneto-optical effect under the action of a magnetic field, can be used for high-sensitivity magnetic field detection, can realize high-sensitivity, high-stability, miniaturization and high-bandwidth optical fiber magnetic field sensing, and has great significance in the development in the field of magnetic field measurement.

The invention discloses a two-step method for preparing a garnet type ferrite nano rare earth magnetic material inorganic hydrated salt phase change material. Firstly, a series of rare earth doped novel composite garnet ferrite nano materials are synthesized through a sol-gel method, and the obtained nano materials are uniform in particle size and stable in magnetism. The magneto-optic effect of the material is effectively enhanced through doping of rare earth cerium ions, and the saturation magnetization of the material is optimized through regulation and control of other rare earth ions. Secondly, compounding the obtained magnetic nano material with an inorganic hydrated salt phase change material (such as a mirabilite-based composite phase change material) through a vacuum impregnation method so as to improve the thermal conductivity and thermal stability of the material, improve the problems of phase layering and supercooling degree of the inorganic hydrated salt phase change material and improve the cycle stability (gt; 5000 times) and phase change latent heat (gt; 200 J / g). The process is reasonable, the preparation process is controllable, and the obtained composite material has excellent magnetic performance and energy storage performance, is suitable for the field of energy storage and conversion of light, electricity, heat, magnetism and the like, and has wide application prospects.

This invention proposes a valley-slow optical waveguide state based on a triangular lattice valley photonic crystal to address the technical problems of weak magneto-optical effect in the optical band and the need for an external strong bias magnetic field in valley-slow optical waveguide states constructed with magneto-optical photonic crystals, as well as the complex fabrication and narrow bandwidth of valley-slow optical waveguide states constructed with honeycomb topological valley photonic crystals. This invention includes a triangular lattice valley photonic crystal with a valley count of 1 and a triangular lattice valley photonic crystal with a valley count of -1. The region formed by the triangular lattice valley photonic crystal with a valley count of 1 is the first region, and the region formed by the triangular lattice valley photonic crystal with a valley count of -1 is the second region. A mustache-shaped interface is formed at the junction of the first and second regions, and a light source is located on the mustache-shaped interface. This invention has advantages such as simpler construction, lower R&D cost, high refractive index, and zero group velocity dispersion, greatly improving the time and intensity of light-matter interaction in waveguide photonic devices, and can be used in integrated photonic devices.

The application discloses a preparation method of a chiral ferromagnetic monodomain liquid crystal material, and synthesizes Sc-doped barium ferrite nanosheets through a hydrothermal method, modifies the nanosheets by using citric acid, obtains ferromagnetic barium ferrite nanosheets, and uniformly disperses the ferromagnetic barium ferrite nanosheets into a chiral liquid crystal matrix; under the action of a weak magnetic field (as low as 30 mT), the anisotropic nanosheet orientation is coupled with the chiral liquid crystal orientation, the nanosheets are oriented along the magnetic field direction, and the ordered arrangement of the chiral liquid crystal matrix is guided; the chiral cluster aggregates and liquid crystal domains in the chiral liquid crystal matrix are migrated and fused, and finally, a wireless, planar defect chiral ferromagnetic monodomain structure is formed. The chiral ferromagnetic monodomain liquid crystal material has magnetic response, and the magneto-optic effect under the action of a magnetic field provides a basis for the application of the chiral ferromagnetic monodomain liquid crystal material in the fields of optical equipment and flexible machines.

The application provides an all-fiber current sensor based on linear measurement of sharp wedge interference, linearly polarized light obtained through a polarizer is divided into two mutually orthogonal linearly polarized lights through a coupler, a delay line and a 45-degree fusion splice point, is modulated by an initial phase modulator, is converted into left-handed and right-handed circularly polarized light through a first lambda / 4 wave plate, enters a sensing optical fiber, and a phase difference of the two circularly polarized lights is generated through a Faraday magneto-optic effect; the phase difference is doubled after being reflected by a mirror, is combined into a linearly polarized light through a first lambda / 4 wave plate and a 45-degree fusion splice point, and the phase difference of the circularly polarized light is converted into a rotation of a polarization plane of the linearly polarized light; the rotation of the polarization plane of the linearly polarized light is converted into synchronous translation of a light spot through a coupler, a second lambda / 4 wave plate, a sharp wedge and a polarizer after being twice phase-modulated by a modulator; and linear measurement of a phase delay angle is obtained through positioning of the light spot by an image sensor; the demodulation result of the application is irrelevant to optical power, and is beneficial to separation and compensation of linear birefringence.

The utility model provides a magnetic detection device which comprises a light source which is configured to emit detection light, and the detection light is polarized light at least at a preset position where the detection light enters a detected object; the detector is configured to at least receive the detection light reflected by the detected object, and the detector detects the magneto-optical effect at the preset position according to the received detection light; the magnetic field generating device comprises a magnetic field generating coil and a pulse power supply device for providing current for the magnetic field generating coil, and the magnetic field generating coil is constructed to be in a form of at least forming a magnetic field environment at the preset position, so that the test requirement in the high-speed changing magnetic field environment can be met; the magnetic field at the preset position is easy to adjust and is convenient to control.

The application discloses a preparation method of a low-cost and easy-to-form flexible magneto-optical composite material, adopts in-situ symbiotic technology to uniformly disperse Fe3O4 or CoFe2O4 or NiFe2O4 nanoparticles which have strong magneto-optical effects and are extremely easy to agglomerate in ZIF-8 with fixed pores, and uses PgC5Cu to modify the ZIF-8 surface as a bridging agent, so that the ZIF-8 is uniformly dispersed in PMMA, and a composite material with excellent magneto-optical properties is successfully constructed. The innovative design not only maintains the original structural stability and optical transparency of the material, but also endows the material with unprecedented flexibility and processability, which provides the possibility for realizing the light weight, portability and flexibility of magneto-optical devices. Compared with traditional pure inorganic magneto-optical crystals, magneto-optical glasses and other materials, the application has the advantages of simple preparation method, short production cycle, significantly reduced energy consumption and cost, easy forming, high flexibility and the like, so that the application can adapt to more extensive application scenarios.

The present invention is a magnetic domain structure (100) having, on a support substrate (10), multilayer films each comprising a plurality of dielectric layers (41) and a plurality of magnetic insulator layers (43) that are alternately stacked. Each of the support substrate (10), the dielectric layers (41), and the magnetic insulator layers (43) comprises a material having a garnet structure. The magnetic domain structure (100) has: on the support substrate (10), a first multilayer film (20) in which the plurality of dielectric layers (41) and the plurality of magnetic insulator layers (43) are alternately stacked; a defect layer (30) that is formed on the first multilayer film (20), and that comprises a magnetic insulator layer (43) that is thicker than the thickness of each of the magnetic insulator layers (43) in the first multilayer film (20); and, on the defect layer (30), a second multilayer film (40) in which the plurality of dielectric layers (41) and the plurality of magnetic insulator layers (43) are alternately stacked. The magnetic domain structure exhibits, in the absence of a magnetic field, a magnetic domain in which magnetization is directed vertically toward the surface of the support substrate and which has a width of 200 nm or more. Thus, provided is a magnetic domain structure that has a large light transmittance and large magneto-optical effect, while exhibiting a magnetic domain having a size that is about the wavelength of used light.

The invention provides an integrated optical waveguide micro magnetic field measurement system based on a magneto-optical effect. The integrated optical waveguide micro magnetic field measurement system comprises a sensing unit, an optical measurement assembly and a signal processing system, the sensing unit comprises: a SiOsubstrate layer; the micro-ring resonant cavity is composed of a silicon straight waveguide and a silicon annular waveguide and is arranged on the SiOsubstrate layer; the Ce: YIG magneto-optical thin film is bonded on the surface of the micro-ring resonant cavity; the SGGG substrate is bonded on the Ce: YIG magneto-optical thin film; the Au microstrip coil is arranged on the surface of the SGGG substrate and is used for accessing to-be-measured current to generate a radial magnetic field; the optical measurement assembly is used for providing a light source and receiving the spectrum output by the sensing unit; and the signal processing system is used for analyzing the resonant wavelength drift distance of the spectrum and inverting the magnetic field intensity. The system can realize on-chip weak magnetic field measurement, has the advantages of simple structure and integration, and aims to fill the gap of an integrated optical waveguide type magnetic field measurement system.