100 results about "Spin wave" patented technology

Provided is a thin-film magnetic head that can stably generate electromagnetic field with a desired frequency, even under the existence of significantly strong write field with frequently reversed direction. The head comprises an electromagnetic-field generating element between the first and second magnetic poles. The electromagnetic-field generating element comprises a spin-wave excitation layer provided adjacent to the first magnetic pole and having a magnetization with its direction varied according to external magnetic fields, for generating an high frequency electromagnetic field by an excitation of spin wave. And a magnetization of the spin-wave excitation layer is biased in a direction substantially perpendicular to its layer surface by a portion of magnetic field generated from the first magnetic pole, and pin-wave excitation current flows in the electromagnetic-field generating element in a direction from the second pole to the first pole.

The thermoelectric conversion efficiency of a thermoelectric conversion device is increased by increasing the figure of merit of a spin-Seebeck effect element.An inverse spin-Hall effect material is provided to at least one end of a thermal spin-wave spin current generating material made of a magnetic dielectric material so that a thermal spin-wave spin current is converted to generate a voltage in the above described inverse spin-Hall effect material when there is a temperature gradient in the above described thermal spin-wave spin current generating material and a magnetic field is applied using a magnetic field applying means.

The present invention provides magnetic recording heads which utilize higher order excitations of dynamic magnetization to increase frequency without the necessity of biasing the write yoke. In accordance with the present invention, the size and placement of current-carrying microstrip waveguide(s) and write pole(s) are controlled in order to generate spin wave write modes. During writing operations, the magnetization is driven into higher order spatial spin wave modes.

Provided are a method of generating strong spin waves, a method of simultaneously generating spin waves and electromagnetic waves, a logic operation device using spin waves, a variety of spin wave devices employing the same, and a method of controlling phases of spin waves. In the method of generating spin waves, strong spin waves are generated by supplying various shapes of energies to a magnetic material in which a magnetic vortex and magnetic antivortex spin structures exist separately or together. When energies are applied to a patterned magnetic material so that magnetic vortex or magnetic antivortex can be generated, a strong torque is generated in a vortex core so that strong spin waves can be generated from the vortex core. The spin waves generated in this way have large amplitudes, short wavelengths, and high frequencies. In the logic operation device using spin waves and the spin wave devices employing the same, wave factors of frequency, wavelength, amplitude, and phase of a spin wave generated by the method of generating spin waves are controlled and wave characteristics such as reflection, refraction, transmission, tunneling, superposition, interference, and diffraction are used. According to the present invention, logic operation spin wave devices capable of performing ultra-high speed information processing and various shapes of optical devices using waves in optics can be reconstructed using spin waves.

To realize an electric field-driven type ferromagnetic resonance excitation method of low power consumption using an electric field as drive power, and provide a spin wave signal generation element and a spin current signal generation element using the method, a logic element using the elements, and a magnetic function element such as a high-frequency detection element and a magnetic recording device using the method. A magnetic field having a specific magnetic field application angle and magnetic field strength is applied to a laminate structure in which an ultrathin ferromagnetic layer sufficiently thin so that an electric field shield effect by conduction electrons does not occur and a magnetic anisotropy control layer are directly stacked on each other and an insulation barrier layer and an electrode layer are arranged in order on an ultrathin ferromagnetic layer side. An electric field having a high-frequency component of a magnetic resonance frequency is then applied between the magnetic anisotropy control layer and the electrode layer, thereby efficiently exciting ferromagnetic resonance in the ultrathin ferromagnetic layer.

A concrete means for making transmission over long distances possible using a spin-wave spin current is provided in a spintronic device and an information transmitting method.At least one metal electrode made of any of Pt, Au, Pd, Ag, Bi, alloys of these, or elements having an f-orbital are provided on top of a magnetic dielectric layer and, so that spin-wave spin current—pure spin current exchange is carried out at the interface between the above described magnetic dielectric layer and the above described metal electrode.

The invention discloses a logic device based on spin wave interference and a multiferroic material. The logic device comprises five functional zones, namely, a spin wave excitation zone, a spin wave frequency division zone, an electric field regulation and control zone, a spin wave interference zone, and a spin wave detection zone; the basic structure and shape of the logic device are achieved through a spin wave transmission medium; due to the dispersion relation of spin waves in the medium, the spin wave transmission direction and model change in case of an external magnetic field or an internal magnetism change of the medium. The logic device provided by the invention can be used for achieving information transmission and logic operation; the spin waves are based on electron spin, and a regulation and control voltage is based on an electric field, so that electron generation or hole movements are eliminated, and the joule heat produced by electric current and the problem of quiescent dissipation due to leak current are effectively avoided.

A signal processing device includes a continuous film, a plurality of spin wave generators, and at least one signal detector. The continuous film includes at least one magnetic layer. The plurality of spin wave generators are provided on the continuous film in such a manner as to be in direct contact with the continuous film or be in contact with the continuous film while having an insulation layer interposed therebetween, and each has a contact surface with the continuous film in a dot shape and generates a spin wave in a region of the magnetic layer of the continuous film by receiving an input signal, the region being immediately under the contact surface. The signal detector is provided on the continuous film and detects, as an electrical signal, the spin waves generated by the spin wave generators and propagating through the continuous film.

To realize an electric field-driven type ferromagnetic resonance excitation method of low power consumption using an electric field as drive power, and provide a spin wave signal generation element and a spin current signal generation element using the method, a logic element using the elements, and a magnetic function element such as a high-frequency detection element and a magnetic recording device using the method. A magnetic field having a specific magnetic field application angle and magnetic field strength is applied to a laminate structure in which an ultrathin ferromagnetic layer sufficiently thin so that an electric field shield effect by conduction electrons does not occur and a magnetic anisotropy control layer are directly stacked on each other and an insulation barrier layer and an electrode layer are arranged in order on an ultrathin ferromagnetic layer side. An electric field having a high-frequency component of a magnetic resonance frequency is then applied between the magnetic anisotropy control layer and the electrode layer, thereby efficiently exciting ferromagnetic resonance in the ultrathin ferromagnetic layer.

The invention relates to a continuous variable light and atom ensemble entanglement production device and mainly aims at solving the technical problem of existing probable production of separated variable light and atom ensemble entanglement. According to the technical scheme, the continuous variable light and atom ensemble entanglement production device comprises a light source unit, a plurality of light beam coupling systems, an atom system and a measurement system. The light source unit is provided with a pump light pulse signal aP output end, a writing light pulse signal aW output end, a reading light pulse signal aR output end, an output end for two local oscillation light signals aL1 and aL2 and an output end for two simulation light pulse signals aL3 and aL4. The device utilizes orthogonal components of light fields in continuous variable quantum information and collective spin waves of atom ensembles to definitely produce Stokes light and atom ensemble entanglement through spontaneous Raman scattering process and conducts measurement and analysis on the light and atom ensemble entanglement through anti-Stokes light produced in the spontaneous Raman scattering process.

The invention discloses a method for controlling spin wave transmission and belongs to the field of spintronics. According to the method, through applying an electric field on a spin wave guide structure, the strength of exchange interaction in a magnetic waveguide material can be effectively changed. An exchange constant is controlled through the electric field, so that the spin wave dispersion relation can be regulated to realize a purpose of controlling the spin wave transmission. The exchange interaction is controlled through the electric field, so that the local precise control of the spin wave transmission can be realized at ultra-low power consumption to provide the possibility for actual application of an ultra-low-power magnonics device compatible with a CMOS (Complementary Metal-Oxide-Semiconductor Transistor) technological process.

The invention relates to a generation device of quantum entanglement among three atomic ensembles, and mainly aims to solve the existing technical problem of probability preparation existed by quantum entanglement among a plurality of atomic ensembles. The invention adopts the technical scheme that the generation device of quantum entanglement among the three atomic ensembles comprises a light source unit, nine acousto-optic modulators, three sets of optical parametric amplifiers, a beam coupling system, the three atomic ensembles, three sets of optical filtering systems and an entanglement measurement system. Under the light writing action of quantum memory, orthogonal component quantum states of three entangled light pulses are mapped into collective spin waves of the three atomic ensembles, and quantum entanglement among the three atomic ensembles is certainly established; then, under the light reading action of quantum memory, the collective spin wave quantum states of the three atomic ensembles are mapped into the orthogonal component quantum states of the three release light pulses, and quantum entanglement among the three atomic ensemble is certainly verified through measuring correlative characteristics of the orthogonal component quantum states of the three release light pulses and the collective spin waves of the three atomic ensembles.

The invention belongs to the technical field of magnetic material signal transmission, in particular to a spin wave directional transmission waveguide structure. According to the waveguide structure, a magnetic structure is constructed on a two-dimensional film which is made of ferromagnetic insulating materials and has the DMI effect. The magnetic structure is composed of a plurality of magnetic domains pointing at the spin wave transmission direction and a magnetic domain wall of a special structure between the magnetic domains. The magnetization directions of the adjacent magnetic domains are opposite. Spin waves are transmitted through the total reflection mode, and the mode that the incident angle range needed for spin wave total reflection is changed through an externally-added electric field is adopted to change the spin wave transmission direction. The function of the structure is similar to the function of a publicly-known optical waveguide fiber, and the main difference is that the magnetic insulating materials serve as a medium of the structure, and the spin waves serve as a carrier of energy and information. According to the spin wave directional transmission waveguide structure, the spin waves can be transmitted in one direction or two directions according to needs, the transmission efficiency is high, attenuation is small, integration and expansion are easy, and the spin wave directional transmission waveguide structure can be combined with an existing electronic chip technology easily.

[Object] To increase the degree of freedom in designing a system for taking out power from a temperature gradient in terms of a thermoelectric conversion element or a thermoelectric conversion device.[Means for Achieving Object] A thermal spin-wave spin current generating member made of a magneto-dielectric body is provided with an inverse spin Hall effect member, a temperature gradient is provided in the above-described thermal spin-wave spin current generating member in the direction of the thickness, and at the same time a magnetic field is applied to the above-described inverse spin Hall effect member in the direction perpendicular to the longitudinal direction and perpendicular to the direction of the above-described temperature gradient by means of a magnetic field applying means so that a thermal spin-wave spin current is converted to a voltage which is taken out in the above-described inverse spin Hall effect member.

The invention relates to a generating device for entanglement of continuous variable atom ensemble and belongs to the generating device for the entanglement of atom ensemble applied to a quantum information network. The generating device is used for solving the technical problem that probability preparation exists in the present preparation for the entanglement of atom ensemble of variables separation. According to the technical scheme provided by the invention, the generating device for entanglement of continuous variable atom ensemble comprises a light source unit, a plurality of beam coupling systems, two sets of atom ensembles, an entanglement measuring system and a feedback unit. The orthogonal component of a light field in the continuous variable quantum information and the collective spin wave of the atom ensemble are utilized to generate the entanglement of two sets of stokes light and spin wave of atom ensemble in a spontaneous raman scattering process, and then interference signals of the two beams of stokes light are fed back to a first atom ensemble through the quantum entanglement exchange, the entanglements of the first atom ensemble and the second atom ensemble are certainly prepared, and the generated stokes light is utilized to measure and analyze the entanglement of the atom ensemble.

The thermoelectric conversion efficiency of a thermoelectric conversion device is increased by increasing the figure of merit of a spin-Seebeck effect element. An inverse spin-Hall effect material is provided to at least one end of a thermal spin-wave spin current generating material made of a magnetic dielectric material so that a thermal spin-wave spin current is converted to generate a voltage in the above described inverse spin-Hall effect material when there is a temperature gradient in the above described thermal spin-wave spin current generating material and a magnetic field is applied using a magnetic field applying means.

The present disclosure relates to a tunable magnonic crystal device comprising a spin wave waveguide, a magnonic crystal structure in or on the spin wave waveguide, and a magneto-electric cell operably connected to the magnonic crystal structure. The magnonic crystal structure is adapted for selectively filtering a spin wave spectral component of a spin wave propagating through the spin wave waveguide so as to provide a filtered spin wave. The magneto-electric cell comprises an electrode for receiving a control voltage, and adjusting the control voltage controls a spectral parameter of the spectral component of the spin wave via an interaction, dependent on the control voltage, between the magneto-electric cell and a magnetic property of the magnonic crystal structure.

A spin-wave waveguide includes a ferromagnetic thin film resembling a wire in shape. A part of the ferromagnetic thin film, large in film thickness, is formed at one end of the ferromagnetic thin film, and a part of the ferromagnetic thin film, small in film thickness, and a part of the ferromagnetic thin film, large in film thickness, are alternately formed on the same plane, for at least not less than one cycle. A part of the ferromagnetic thin film, large in film thickness, is formed at the other end of the ferromagnetic thin film, wherein an insulating film, and an electrode film are stacked in this order on the ferromagnetic thin film in the part of the ferromagnetic thin film, large in film thickness.

There is provided a magnonic-crystal spin wave device capable of controlling a frequency of a spin wave. The magnonic-crystal spin wave device according to the invention includes a spin wave waveguide made of magnetic material, and the spin wave waveguide guides the spin wave so as to propagate in one direction, and includes a magnonic crystal part which has a cross-section orthogonal to the direction, and at least one of a shape, area size, and center line of the cross-section periodically changes in the direction. In accordance with the invention, it is possible to easily control the frequency of the spin wave using the spin wave waveguide made of single magnetic material.

As a technique for attaining a reduction in power consumption, there is a technique for reducing power consumption using a spin wave. No specific proposal concerning spin wave generation, spin wave detection, and a latch technique for information has been made.A device applies an electric field to a first electrode of a nonmagnetic material using a thin line-shaped stacked body including a first ferromagnetic layer and a nonmagnetic layer to thereby generate a spin wave in the first ferromagnetic layer, and detects a phase or amplitude of the spin wave propagated in the first ferromagnetic layer using a second electrode of a ferromagnetic material with a magnetoresistance effect.

Provided are a method of generating strong spin waves, a method of simultaneously generating spin waves and electromagnetic waves, a logic operation device using spin waves, a variety of spin wave devices employing the same, and a method of controlling phases of spin waves. In the method of generating spin waves, strong spin waves are generated by supplying various shapes of energies to a magnetic material in which a magnetic vortex and magnetic antivortex spin structures exist separately or together. In the logic operation device, wave factors of frequency, wavelength, amplitude, and phase of a spin wave generated by the method of generating spin waves are controlled and wave characteristics such as reflection, refraction, transmission, tunneling, superposition, interference, and diffraction are used.

Provided is a thin-film magnetic head that can stably generate electromagnetic field with a desired frequency, even under the existence of significantly strong write field with frequently reversed direction. The head comprises an electromagnetic-field generating element between the first and second magnetic poles. The electromagnetic-field generating element comprises a spin-wave excitation layer provided adjacent to the first magnetic pole and having a magnetization with its direction varied according to external magnetic fields, for generating an high frequency electromagnetic field by an excitation of spin wave. And a magnetization of the spin-wave excitation layer is biased in a direction substantially perpendicular to its layer surface by a portion of magnetic field generated from the first magnetic pole, and pin-wave excitation current flows in the electromagnetic-field generating element in a direction from the second pole to the first pole.

The invention discloses a modulation method for spin waves in a self-bias magnetic oscillator waveguide, which is used for modulation a propagation behavior of the spin waves in the waveguide, wherein the propagation behavior comprises the maximum propagation frequency, the cut-off frequency and the propagation path of the spin waves. The modulation method comprises the steps of adjusting the maximum propagation frequency at which the spin waves can be constrained in a middle channel of the waveguide; adjusting the cut-off frequency of the spin waves in channels at two sides of the waveguide; and adjusting the propagation path of the spin waves. According to the invention, modulation can be performed on the propagation behavior of the spin waves on the switched elastic magnetic structure based magnetic oscillator waveguide.

The invention discloses a spinel Li-series ferrite material for an x-band to millimeter wave-band lock phase shifter, which has a chemical formula: Li0.5(1-a+b-c-d-e)ZnaMgeTibCucCodBinMnmFe0.5(5-a-3b-c-d-e)-m-n-sigma O4, wherein a is more than or equal to 0 and less than or equal to 0.4; b is more than or equal to 0 and less than or equal to 0.5; c is more than or equal to 0.002 and less than or equal to 0.006; d is more than or equal to 0.002 and less than or equal to 0.008; e is more than or equal to 0 and less than or equal to 0.5; m is more than or equal to 0.03 and less than or equal to 0.08; n is more than or equal to 0.002 and less than or equal to 0.006; sigma is an iron lack amount, and is more than or equal to 0.02 and less than or equal to 0.08. According to the spinel Li-seriesferrite material, a small amount of Cu<2+> replaces Li<1+> and Fe<3+> of the Li0.5Fe2.5O4 system, thereby reducing the coercive force of the material and increasing the remanence ratio of the material; an appropriate amount of Co<3+> is added for improving the power bearing capacity of the material. When the residual magnetic induction intensity Br of the microwave ferrite material is between 148mT and 343 mT, the spin wave line width deltaHk is 400 to 800 A / m, the coercive force Hc is less than or equal to 80 A / m, the remanence ratio R is 0.89 to 0.96, and the Curie temperature Tc is 450 to500 DEG C; moreover, the material has low electromagnetic loss characteristics and can be applied to the x-band to millimeter wave-band high-power lock phase shifter.

The invention discloses a spin wave logic device based on a Bloch type domain wall, and belongs to the technical field of magnetic oscillator devices. The spin wave logic device comprises a bent domain wall waveguide, a microstrip antenna for exciting spin waves and a receiving antenna, wherein the bent domain wall waveguide comprises a hard magnetic layer and a soft magnetic layer positioned on the hard magnetic layer, the microstrip antenna for exciting spin waves is fixedly connected with two ends of the bent domain wall waveguide, and the receiving antenna is positioned on a symmetry axisof the bent domain wall waveguide and is fixedly connected with the soft magnetic layer of the bent domain wall waveguide. According to the spin wave logic device provided by the invention, the spin wave transmission is based on the Bloach-type domain wall waveguide, and the hard magnetic layer has an influence on the effective field distribution of the soft magnetic layer through an exchange coupling effect, so that the soft magnetic layer forms a nano-scale Bloach-type domain wall. Therefore, external field energy input is not needed during spin wave transmission, the energy consumption of the system is greatly reduced, and meanwhile, the anti-interference performance of spin waves is enhanced.

The invention discloses a terahertz detector based on an antiferromagnetic nonmagnetic metal heterojunction, and belongs to the technical field of photoelectric detection. The method comprises the following steps: converting terahertz radiation energy into spin waves by utilizing the antiferromagnetic coupling resonance absorption characteristic of an antiferromagnetic material in a terahertz waveband, converting the spin waves into charge flow at an interface by utilizing the reverse spin Hall effect in nonmagnetic metal with strong spin-orbit coupling, and reading out voltage signals from electrodes on two sides of the surface of the nonmagnetic metal so as to realize the detection of terahertz radiation. The terahertz detector realizes terahertz detection by utilizing the electron spinproperty, is a spin terahertz detector, and has the advantages of zero power consumption, quick response, easiness in integration, room-temperature working and the like.

A concrete means for making transmission over long distances possible using a spin-wave spin current is provided in a spintronic device and an information transmitting method.At least one metal electrode made of any of Pt, Au, Pd, Ag, Bi, alloys of these, or elements having an f-orbital are provided on top of a magnetic dielectric layer and, so that spin-wave spin current—pure spin current exchange is carried out at the interface between the above described magnetic dielectric layer and the above described metal electrode.

The invention discloses a method for detecting a spin wave information transmission frequency, and belongs to the technical field of the spin wave detection. The method comprises the following steps:exciting an incident spin wave from one side of a magnetic domain wall loaded with a spin wave to be detected, enabling the incident spin wave to pass through the magnetic domain wall and interact with the spin wave to be detected so as to form a transmission spin wave, and analyzing to obtain an interval of frequencies between the transmission spin wave and the incident spin wave, namely the frequency of the spin wave transmitted along the magnetic domain wall. The method is capable of dynamically monitoring and analyzing to obtain the frequency and the wave vector information of the spin wave transmitted along the magnetic domain wall. Compared with a Brillouin light scattering spectrum technology (BLS) which is used for detecting the information of the spin wave transmitted in the magnetic domain wall at the present stage, the method does not need to determine an accurate position of the magnetic domain wall, and a magnetic structure cannot be damaged, so the real-time monitoring inan information transmission process is realized, and the method has the advantages of simple and convenient operation, low cost, and good detection effect.