27 results about "Yttrium iron garnet" patented technology

The invention discloses a grinding and polishing processing method of an ultra-precise YIG (yttrium iron garnet) single crystal, which is suitable for a planar YIG (yttrium iron garnet) single crystal (circle) prepared by a liquid phase epitaxy method, a molten salt method and a floating zone melting method, and comprises the following steps: grinding the YIG single crystal, and controlling the thickness and the total thickness deviation (TTV) of the crystal; rough polishing is carried out on the YIG single crystal, and subsurface damage of the wafer is eliminated; and finally, carrying out ultra-precision polishing on the YIG crystal to realize surface planarization with sub-nano-scale surface roughness. According to the method, the surface roughness of the yttrium iron garnet single crystal can be controlled below 1nm.

The invention discloses a method for preparing high-transparency yttrium iron garnet ceramic by combining a chemical synthesis way with pressureless sintering. The method comprises the following steps: synthesizing submicron alpha-iron oxide powder; forming the powder; and carrying out pressureless sintering in an oxygen atmosphere. The YIG transparent ceramic prepared in the invention has very high transmittance (the highest transmittance is 40% at 1.5 m) in an infrared band, and the YIG transparent ceramic with high optical quality (the transmittance is as high as 75% at 1.5 m) can be obtained by combining oxygen hot isostatic pressing sintering. And the preparation process is simple, the synthesis conditions are easy to control, the material synthesis period is short, energy and cost are saved, and the requirements of industrial production are met.

The invention provides a praseodymium-doped yttrium iron garnet photosensitive sol, a film fine pattern and a preparation method of the praseodymium-doped yttrium iron garnet photosensitive sol. Y (C2H3O2) 3, Pr (NO3) 3.6 H2O and Fe (NO3) 3.9 H2O are used as raw materials, propionic acid is used as a catalyst, benzoylacetone is used as a photosensitive chelating agent, methanol is used as a solvent, the raw materials are mixed, methanol is added for volume metering, and the Y2.85Pr0.15 Fe5O12 photosensitive sol is obtained after aging. Y2.85Pr0. 15Fe5O12 photosensitive sol is used as a precursor, a gel film is dip-coated on a substrate by adopting a dip-coating method, and the Y2.85Pr0. 15Fe5O12 thin film fine pattern is obtained by drying, exposing, dissolving and washing and annealing. The Y2. 85Pr0. 15Fe5O12 ultraviolet photosensitive sol prepared by the preparation method disclosed by the invention is stable, and a gel film with a relatively large size can be obtained; the preparation process is simple, and a large-area Y < 2.85 > Pr < 0.15 > Fe < 5 > O < 12 > fine pattern can be prepared; the prepared Y2. 85Pr0. 15Fe5O12 fine pattern is complete in structure and clear in outline; according to the method, the problems that in a traditional preparation method, the morphology of a fine pattern of the Y2. 85Pr0. 15Fe5O12 film is damaged, and the saturation magnetization intensity is reduced are solved.

The invention relates to the technical field of magneto-optical materials, and particularly provides a cerium-doped yttrium iron garnet single crystal thick film and a preparation method thereof. The chemical formula of the cerium-doped yttrium iron garnet single crystal thick film is Ce < x > R < 3-x > Fe < y > M < z > A < 5-y-z > O < 12 >, x is equal to 0.3 to 1.4, y is equal to 0.05 to 5, and z is equal to 0.01 to 1; in the chemical formula of the cerium-doped yttrium iron garnet single crystal thick film, the element R is europium Eu, and / or the element A is selected from at least one of zirconium Zr, silicon Si and tin Sn. According to the method, the Ce < 4 + > concentration in the growth stage of the single crystal thick film is reduced, so that the product quality of the cerium-doped yttrium iron garnet single crystal thick film is improved.

The invention belongs to the technical field of antennas, and discloses an omnidirectional scanning leaky-wave antenna based on a one-way edge mode, which comprises a one-way waveguide formed by sequentially splicing a metal layer, an air layer and a photonic crystal, and the one-way waveguide has the one-way edge mode in an air light cone. Wherein the photonic crystal is formed by embedding periodically arranged square dielectric cylinders in a yttrium iron garnet background, a static magnetic field is applied to the photonic crystal in the z direction, and periodic hollow holes are formed in a metal layer of the one-way waveguide. According to the invention, the structure is simple, the photonic crystal forbidden band is low, and the full-space scanning capability from backward end emission, lateral radiation and forward end emission is realized.

The invention provides a microwave phase measurement system based on magneton-photon coupling characteristics. According to the system, an integrated electrode support / GGG / YIG / Pt multilayer structure is embedded in a microwave cavity, and magnetons carry microwave phase information through coupling of the magnetons and photons in the YIG. Magneton precession of the YIG layer causes spin current to be generated in the Pt layer, the spin current is converted into measurable voltage signals through inverse spin Hall effect, and high-resolution phase measurement is realized by means of frequency mixing, coherent detection and the like. The method is high in anti-interference capability, can realize high-sensitivity and low-cost microwave phase measurement, and is expected to be used in the fields of spintronics, microwave measurement, quantum information reading and the like.

This invention discloses a method for preparing highly stable gyromagnetic ferrites, belonging to the field of magnetic material preparation technology. The method includes formulation preparation, multi-stage sand milling and granulation, molding and sintering, composite structure preparation, and precision machining steps. The formulation consists of VIII-series, IIIB-series, lanthanide-series, IVB-series, and VIIB-series metal oxides in a specific molar ratio, with rare earth nano-additives added to enhance lattice stability. Uniform slurry particle size is achieved through two-stage sand milling and spray granulation. A curved sintering process is used to control the temperature rise and oxygen content to obtain a high-density green body. A yttrium iron garnet or dysprosium iron garnet functional layer is formed on the surface of the green body by magnetron sputtering, constructing a multi-layer composite structure. Finally, a conductive modification layer is formed on the surface through integrated laser cutting and chemical mechanical polishing. The gyromagnetic ferrite material prepared by this method exhibits high saturation magnetization, low high-frequency loss, and excellent thermal stability, making it suitable for 5G communication, radar, and high-frequency microwave devices.

A method for preparing high-dielectric, moderately saturated magnetized yttrium iron garnet ferrite belongs to the field of microwave and magnetic materials technology. This invention utilizes a method that substitutes the dodecahedral Y-site in the garnet structure. 3+ Octahedral and tetrahedral Fe 3+ The formulation and secondary granulation process result in a material with moderate saturation magnetization (1050G < 4πMs < 1250G), suitable for low-frequency microwave ferrite devices. It also possesses high dielectric constant ε' > 20, low ferromagnetic resonance linewidth ΔH ≤ 24Oe, and low dielectric loss tanδ. ε <1×10 ‑4 This can reduce the design size of the device, which is beneficial for the miniaturization and weight reduction of microwave ferrite devices.

A method for preparing high dielectric constant, small linewidth yttrium iron garnet ferrite material belongs to the field of ferrite material preparation technology. This invention utilizes the dodecahedral Y-axis in the garnet structure... 3+ octahedral Fe 3+ Instead of using a traditional method, this invention employs a two-stage pre-calcination process and a three-stage ball milling process (low speed followed by high speed), requiring only three ball milling operations, one granulation operation, and one sintering operation to produce yttrium iron garnet ferrite materials. The two-stage pre-calcination process results in better powder activity, a higher degree of solid-state reaction completion during sintering, and superior material properties. The three-stage ball milling process, using a low-speed followed by a high-speed process, enhances the particle size uniformity of the milled powder. The resulting ferrite exhibits a high dielectric constant ε' > 20, a low ferromagnetic resonance linewidth ΔH ≤ 25Oe, and a low dielectric loss tanδ. ε <1×10 ‑4 .

The invention discloses a preparation method of a magneto-optical film based on yttrium iron garnet (YIG) ceramic ion slices. Comprising the following steps: (1) obtaining YIG transparent ceramic with a first polished surface; (2) obtaining a heterogeneous substrate with a second polished surface; (3) injecting high-energy ions into the first polished surface of the YIG ceramic, wherein the energy is determined by the thickness of the YIG magneto-optical film on the required heterogeneous substrate; (4) performing low-temperature direct bonding on the first polished surface of the YIG ceramic and the second polished surface of the heterogeneous substrate to obtain a first composite structure; and (5) annealing the first composite structure to obtain the YIG magneto-optical thin film structure on the heterogeneous substrate. The method is based on the high-quality YIG magneto-optical ceramic and is combined with the ion slicing technology, the YIG magneto-optical thin film on the heterogeneous substrate obtained through the novel technology is large in structure size, high in quality and low in cost, and the problems that a composite structure thin film manufactured through a traditional direct thin film growth scheme is poor in quality, small in scale, low in efficiency, incompatible with the CMOS technology and the like are hopefully solved.

The invention discloses a topological insulator grating structure for enhancing a Faraday rotation angle, and aims to improve the unit Faraday rotation angle. The topological insulator grating structure for enhancing the Faraday rotation angle comprises a grating and a magneto-optical material, the grating is formed on the surface of the magneto-optical material, the grating is a topological insulator material, the chemical formula of the topological insulator material is Bi < x > Sb < 2-x > Te < 3 >, x is equal to 0-2, and the magneto-optical material is bismuth ion doped yttrium iron garnet or cerium ion doped yttrium iron garnet. The grating structure of the topological insulator material shows an extremely high Faraday effect enhancement effect in the visible light and near-infrared range, the unit Faraday rotation angle of the magneto-optical material is increased, and compared with a plasma grating made of a metal material, back scattering of photons can be avoided, additional scattered light is reduced, light loss is reduced, and the photoelectric conversion efficiency is improved. And the requirement of a miniaturized and integrated optical isolator on a magneto-optical material can be met.

The invention discloses a tunable one-way and two-way microwave notch filter and a design method. The filter has one-way and two-way filtering functions. The structure of the device mainly comprises an artificial surface plasmon polariton planar waveguide and a ferrite yttrium iron garnet microwave resonator, a circular polarization spin polarization microwave field with a spin-momentum locking characteristic is generated at a specific position in the planar waveguide, a magneton mode generated in the microwave resonator and the spin polarization microwave field are subjected to spin selective coupling, and under the critical coupling condition, microwaves input in one direction are completely filtered after passing through magneton, and then are subjected to spin polarization. And the microwaves input in the other direction are completely transmitted, so that the unidirectional filtering function of the microwaves at a specific frequency is realized. And an additional microwave resonator is further loaded, and the bidirectional filtering function can be realized by expanding the experimental configuration. The invention does not need complex structural design and strict parameter regulation and control, and provides a simpler, more convenient and more flexible method to realize the multifunctional microwave notch filter.

The invention provides a high-pressure oxygen atmosphere annealing device and process for yttrium iron garnet crystals, and the high-pressure oxygen atmosphere annealing device for the yttrium iron garnet crystals comprises a heating furnace, a high-pressure reaction cavity, a homogeneous ceramic sample cavity homogeneous with the yttrium iron garnet crystals, an oxygen supply system and a vacuum pipeline, the invention relates to a high-pressure oxygen atmosphere annealing process for yttrium iron garnet crystals. The high-pressure oxygen atmosphere annealing process comprises the following steps: pretreatment: placing the yttrium iron garnet crystals in a homogeneous ceramic sample cavity; oxygenating and pressurizing; heating and annealing: operating the heating furnace, heating the interior of the high-pressure reaction cavity to 1000-1200 DEG C at the speed of 50-100 DEG C / h, and keeping the temperature constant for 2-10 hours; gradient cooling; and releasing pressure and taking materials. According to the invention, the problems of low annealing efficiency and limited photomagnetic performance caused by insufficient pressure in the prior art are solved.

This invention discloses a photonic crystal structure with multiple types of topological edge states and its implementation method, belonging to the field of photonic crystal and topological photonics technology. The photonic crystal consists of a triangular lattice structure composed of multiple sets of lattice units with a lattice constant of . Each set of lattice units includes multiple sub-lattice units composed of yttrium iron garnet magneto-optical pillars and NdFeB permanent magnets at their upper and lower ends. The sub-lattice units are uniformly distributed in a polygonal pattern, with their circumferential spacing divided into two groups: one group shrinks inward along the center of the sub-lattice, and the other group expands outward along the center of the sub-lattice, forming two nested triangular lattice structures. This structure, through the coordinated design of magnetization direction and lattice structure symmetry, simultaneously breaks the time-space inversion symmetry, achieving for the first time the coexistence of chiral and antichiral topological edge states, and chiral and Gull-Hall topological edge states, on the same photonic crystal structure configuration.

The invention belongs to the field of electronic information functional materials and microelectronic devices, and provides a high-dielectric yttrium iron garnet ferrite material and a preparation method thereof, the chemical formula of the high-dielectric yttrium iron garnet ferrite material is Y < 2.1-x > Bi < 0.9 > Ca < x > Zr < x > Fe < 5-x > O < 12 >, and x is greater than or equal to 0.15 and less than or equal to 0.25. The performance of the YIG ferrite material is regulated and controlled through Bi < 3 + >-Ca < 2 + >-Zr < 4 + > ion combined substitution, the relative dielectric constant epsilon r of a traditional yttrium iron garnet ferrite material is increased to 18-23, the saturation magnetization 4 pi Ms is 1680-1950 Gs, meanwhile, the ferromagnetic resonance line width delta H is finally kept at a small value of 40-80 Oe, and the ferrite material has a wide application prospect. The development of miniaturization, light weight and high integration of microwave devices is facilitated; the material is rich in raw materials, low in cost and beneficial to industrial application, and has important application prospects in the fields of microwave communication, radar systems, satellite communication and the like.

This invention relates to a method for preparing ion-doped yttrium iron garnet powder, belonging to the field of materials preparation. The method specifies a method for preparing ion-doped yttrium iron garnet powder, wherein the chemical composition of the ion-doped yttrium iron garnet powder is Ce. a Bi b Y (3‑a‑b) Fe5O 12 Where a≤0.4, b≤0.4, and a and b are not both 0, the method includes the following process steps: first, synthesizing a polymeric network gel containing Ce, Bi, Y, and Fe ions; then calcining the obtained polymeric network gel to obtain a loose and porous oxide precursor powder; placing the obtained oxide precursor powder in a high-temperature horizontal ball mill for high-temperature controlled-pressure ball milling, and finally obtaining ion-doped yttrium iron garnet powder. The method of the present invention can obtain composite oxide powder with high phase purity, low defect density, and good compactness and grain uniformity.

The invention discloses a high-mechanical-property low-loss high-frequency manganese-zinc power ferrite and a preparation method, and relates to the technical field of soft magnetic ferrite materials. The high-mechanical-property low-loss high-frequency manganese-zinc power ferrite is composed of main components and auxiliary components; the main components comprise, in terms of oxide, 53.5 to 56.5 mol% of Fe2O3, 3.5 to 5.5 mol% of ZnO, and 38.0 to 43.0 mol% of MnCO3; the auxiliary components comprise 0.01-0.03 wt% of nano yttrium iron garnet, 0.01-0.03 wt% of nano yttrium iron garnet, 0.01-0.03 wt% of nano yttrium iron garnet, 0.01-0.03 wt% of nano yttrium iron garnet and 0.01-0.03 wt% of nano yttrium iron garnet, caSiO3: 0.01 wt% to 0.05 wt%; the content of Nb2O5 is 0.01 to 0.04 weight percent; ho2O3: 0.1 wt% to 0.8 wt%; and Co2O3: 0.1 to 0.3 wt%. On the basis of improving the bending strength, the eddy-current loss is reduced, and the high-frequency low-loss high-bending-strength cable has high bending strength and high-frequency low-loss performance.

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.

The application discloses a cavity-magnon coupling-based microwave isolator device with adjustable isolation, and relates to the microwave isolator field.The device comprises a quadrupole microstrip line resonant cavity, a yttrium iron garnet ball, a power divider, a first complex amplitude adjusting device and a second complex amplitude adjusting device;an external magnetic field is applied at the yttrium iron garnet ball, so that the magnon mode frequency generated by the yttrium iron garnet ball is consistent with the cavity mode frequency, forming a cavity mode-magnon-cavity mode coupling configuration;the power divider divides the input signal into two paths, and the two paths of input signals are adjusted in complex amplitude by the first complex amplitude adjusting device and the second complex amplitude adjusting device;the quadrupole microstrip line resonant cavity outputs the output signal with the required isolation of the scene under the cavity mode-magnon-cavity mode coupling configuration according to the two paths of input signals after the complex amplitude adjustment ratio.The application can realize the adjustment of the isolation by controlling the complex amplitude ratio of the input signal, and meet the requirements of various application scenes.

The application discloses a tunable one-way and two-way microwave wave trap filter and a design method, which has one-way and two-way filtering functions. The device structure mainly comprises an artificial surface plasmonic polariton planar waveguide and a yttrium iron garnet microwave resonator. Circular polarization spin polarized microwave fields with spin-momentum locking characteristics are generated at specific positions in the planar waveguide, and the magnon mode generated in the microwave resonator is spin-selectively coupled with the spin polarized microwave field. Under the critical coupling condition, the microwave input in one direction is completely filtered after the magnon, and the microwave input in the other direction is completely transmitted, so that the one-way filtering function of the microwave at a specific frequency is realized. Further loading of additional microwave resonators and through the extension of the experimental configuration, the two-way filtering function can also be realized. The application provides a more simple and flexible method to realize the multifunctional microwave wave trap filter without complex structure design and strict parameter control.

The application belongs to the technical field of antennas, and discloses an omnidirectional scanning leaky-wave antenna based on a unidirectional edge mode, which comprises a unidirectional waveguide composed of a metal layer, an air layer and a photonic crystal which are sequentially spliced, wherein the unidirectional waveguide has a unidirectional edge mode in an air light cone, the photonic crystal is composed of square dielectric columns arranged periodically and embedded in a yttrium iron garnet background, a static magnetic field is applied to the photonic crystal along the z direction, and the metal layer of the unidirectional waveguide is provided with periodic hollow holes. The application has the advantages of simple structure, low photonic crystal band gap, and the ability of full-space scanning from a backward end-fire, lateral radiation and then a forward end-fire.

Methods and apparatus for providing a frequency selective limiters (FSL) having a free-standing Yttrium Iron Garnet (YIG) film with first and second opposing surfaces. A metal plane is disposed on one surface of the YIG film to provide the YIG film with a metalized surface. At least one transducer is disposed on the other surface of the YIG film with a respective ends coupled to the metalized surface of the YIG film.

This invention discloses a high-saturation magnetization, low-loss yttrium iron garnet ferrite material and its preparation method. The aim is to address the shortcomings of existing YIG ferrite materials, which have a saturation magnetization of approximately 1750 Gs, making it difficult to meet the diverse requirements of high-frequency microwave devices for wide bandwidth and low loss performance. Furthermore, simply increasing saturation magnetization through ion substitution often results in increased magnetic loss and broadened ferromagnetic resonance linewidth. This invention proposes a high-saturation magnetization, low-loss yttrium iron garnet ferrite material and its preparation method. This invention achieves a relative permittivity ε through Sr-Zr ion synergistic substitution. r The ferromagnetic resonance linewidth ΔH is 90~105 Oe, and the saturation magnetization is 4π M. s A high-saturation magnetization and low-loss yttrium iron garnet ferrite material with a magnetization range of 1800~1900 Gs has been developed, achieving synergistic optimization of high saturation magnetization and low loss, and providing a material basis for the expanded application of devices such as microwave circulators and isolators.

The invention relates to a preparation method of ion-doped yttrium iron garnet powder, and belongs to the field of material preparation. The invention relates to a preparation method of ion-doped yttrium iron garnet powder, the chemical composition of the ion-doped yttrium iron garnet powder is CeaBibY (3-a-b) Fe5O12, a is less than or equal to 0.4, b is less than or equal to 0.4, and a and b are not 0 at the same time, the method comprises the following process steps: firstly synthesizing polymerized network hydro-gel containing Ce, Bi, Y and Fe ions, then calcining the polymerized network hydro-gel, and drying the calcined polymerized network hydro-gel to obtain the ion-doped yttrium iron garnet powder. Loose and porous oxide precursor powder is obtained; and placing the obtained oxide precursor powder in a high-temperature horizontal throwing type ball mill for high-temperature pressure-controlled atmosphere ball milling, and finally obtaining the ion-doped yttrium iron garnet powder. According to the method, the composite oxide powder with high phase purity, low defect density and good density and grain uniformity can be obtained.

The invention belongs to the technical field of magneto-optical crystal preparation, and relates to a bismuth-doped europium yttrium iron garnet magneto-optical crystal and a preparation method and application thereof. According to the preparation method, a magneto-optical crystal with a chemical formula of Eu < 3-x-y-z > Bi < x > Y < y > Tb < z > Fe < 5-w > Ga < w > O < 12 > is grown by adopting a top seed crystal method, wherein x ranges from 0.30 to 0.43, y ranges from 1.20 to 2.06, z ranges from 0.08 to 0.17, and w ranges from 0.09 to 0.17. The method has the advantages of high crystal growth speed, simple process and the like, and can be used for preparing centimeter-level single crystals. A Bi2O3-Fe2O3 self-service solvent is used for crystal growth, and compared with a Pb-containing cosolvent system, the Bi2O3-Fe2O3 self-service solvent is more environmentally friendly, and harm to a human body and pollution to the environment can be reduced. The Faraday rotation angle of the garnet crystal can be increased by doping Bi in a proper amount.

The invention discloses a high-dielectric high-power low-loss ferrite material and a preparation method thereof, the matrix structure is yttrium iron garnet, the ferrite material belongs to a gyromagnetic ferrite material, the chemical formula of the ferrite material is Y3-a-b-cBiaCabDycZrbIndFe5-b-d-fO12-1. 5f, a is greater than or equal to 0.9 and less than or equal to 1.55, b is greater than or equal to 0.2 and less than or equal to 0.45, c is greater than or equal to 0 and less than or equal to 0.06, d is greater than or equal to 0 and less than or equal to 0.3, and f is greater than or equal to 0 and less than or equal to 0.2. The invention also discloses a preparation method of the ferrite material, the specific gravity of a liquid phase medium is gradually reduced in two times of ball milling, the particle size of the material is reduced, and the particle uniformity is improved. And a sectional sintering process is combined, so that uniform generation of fine grain ferrite is promoted, and precipitation of a second phase is inhibited. According to the ferrite material prepared by the invention, the dielectric constant is 22-31, the ferromagnetic resonance line width is 70-110 Oe, the saturation magnetization is 1600-1950 Gs, and the electromagnetic loss is tan delta epsilon lt; the ferrite material has good performance stability, and can be applied to a small-size ultra-wideband circulator.

Circuits, methods, and apparatus that can provide oscillator circuits that have reduced phase noise. An example can provide a yttrium-iron-garnet oscillator in a loop with a loop amplifier and a phase-shift circuit. The yttrium-iron-garnet oscillator can act as a resonator. Quadrature outputs of the yttrium-iron-garnet oscillator can drive a phase detector that can provide a control signal to the phase-shift circuit. The phase-shift circuit can then reduce or cancel phase noise in the loop, thereby enabling the loop to provide a reference signal having reduced phase noise.