10results about "Low dimensional magnetism materials" patented technology

A method of assembling a chiral superstructure includes applying a quadrupole magnetic field to a plurality of magnetic nanostructures and configuring the plurality of magnetic nanostructures into a chiral superstructure by controlling a magnitude and a direction of the quadrupole magnetic field. A magnetic chiral superstructure includes a plurality of magnetic nanostructures assembled into a chiral superstructure by applying a quadrupole magnetic field to the plurality of magnetic nanostructures and configuring the plurality of magnetic nanostructures into a chiral superstructure by controlling a magnitude and a direction of the quadrupole magnetic field.

The invention discloses a two-dimensional Van der Waals ferromagnetic quantum material with high Curie temperature and a preparation method and application thereof, the quantum material is of a two-dimensional nanosheet crystal structure and belongs to a layered Van der Waals material, and the chemical formula of the quantum material is InFeTe3; the two-dimensional InFeTe3 crystal has a hexagonal structure, and the lattice constant # imgabs0 # # imgabs1 # belongs to a trigonal system and a P3m1 space group; the method comprises the following steps: mixing In, Fe and Te elementary substances, pre-crystallizing to obtain an InFeTe metal block, and sublimating, transferring and crystallizing the metal block under vacuum sealing by adopting a double-temperature-zone tubular furnace to obtain millimeter-level InFeTe3 crystals with silver metal luster; stripping and transferring the InFeTe3 crystal, and then annealing the InFeTe3 crystal in inert gas to obtain a few-layer two-dimensional InFeTe3 crystal; the preparation method disclosed by the invention has the characteristics of simplicity, low energy consumption and high repeatability, and the two-dimensional InFeTe3 crystal prepared by the preparation method disclosed by the invention has the characteristics of high saturation magnetization and high Curie temperature, and can be applied to spin electronic devices and quantum devices.

The embodiment of the invention provides a magnetic regulation and control method for a two-dimensional material, and the method comprises the following steps: forming the two-dimensional material on a substrate, and enabling the two-dimensional material to have local magnetism; and performing post-annealing treatment on the two-dimensional material formed on the substrate to control the atom vacancy defect of the two-dimensional material so as to regulate and control the local magnetism of the two-dimensional material. According to the magnetic regulation and control method of the two-dimensional material provided by the embodiment of the invention, the atomic vacancy defect of the two-dimensional material is controlled in a post-annealing manner, so that the atomic-scale precision magnetic regulation and control of the two-dimensional material are realized.

The invention concerns a method for fabricating an array of magnets (10), the method comprising: - a step of deposition of a coercivity changing element according to a pattern on a first material having a first coercivity value, the coercivity changing element being adapted to change the coercivity of the first material, and - a step of diffusion of the coercivity changing element into certain regions to form a magnetic layer (16) having first areas (A1) made of the first material and second areas (A2) having a second coercivity, made of a second material comprising the first material and the coercivity changing element.

This invention discloses an elliptical skyrmion and its identification method, specifically including: inducing a novel elliptical skyrmion in a traditional magnetic interface system by applying external stress or other means; the topological quasiparticle moves directionally to a "cross-shaped" identification end under the drive of an input current; by utilizing the inequivalence of information such as spin helical length and Hall angle of the elliptical skyrmion in different directions, different signals can be read out at the identification end, thus completing the identification of the elliptical skyrmion; furthermore, when the elliptical skyrmion reaches the output end formed by the magnetic tunnel structure, the first resistance state in the original storage unit is adjusted to the second resistance state, thus completing the storage of information.

Embodiments provide active beam steering in an extreme sub-wavelength nano-antenna using directed surface acoustic waves (SAWs). A SAW launched in the substrate excites resonant spin waves in the nanomagnets of a nanomagnet array at specific (GHz) frequencies via magnon-phonon coupling, which radiate electromagnetic waves at those frequencies via magnon-photon coupling. These specific frequencies are determined by the size and the shape of the nanomagnets and hence can be altered by changing the size and / or the shape. Normally, one would expect such an ultrasmall antenna to behave as a point source that radiates isotropically. Surprisingly, it does not because of the intrinsic anisotropy in the phonon-magnon and magnon photon coupling in this system. The radiation pattern (both elevation and azimuthal) is anisotropic. By changing the direction of SAW propagation, one can change the pattern. A multiphase clock excites the electrodes pairwise sequentially to scan the beam electronically, thereby realizing the function of an active electronically scanned array (AES A).

A magnetic artificial honeycomb lattice is provided. The magnetic artificial honeycomb lattice includes a multiplicity of connecting elements separated by hexagonal cylindrical pores. The (a) hexagonal cylindrical pores (i) have widths that are substantially uniform; and (ii) are substantially equispaced. The (b) connecting elements includes a magnetic material layer. The connecting elements have: (i) lengths that are substantially uniform; (ii) widths that are substantially uniform; and (iii) a thickness of the magnetic material layer that is substantially uniform and an average thickness. The magnetic artificial honeycomb lattice is configured to receive two input currents and configured to output an output voltage based upon the two input currents.

The embodiment of the invention provides a magnetic introduction method of a two-dimensional material. The magnetic introduction method comprises the following steps: preparing a substrate with a step structure; and preparing a two-dimensional material layer on the substrate to introduce magnetism into the two-dimensional material layer at the step structure region of the substrate. According to the magnetism introduction method of the two-dimensional material provided by the embodiment of the invention, the two-dimensional material layer is formed on the step-type substrate, so that the two-dimensional material layer covering the step generates strain, uniform magnetism in the step direction is generated, intrinsic element composition of the material can be kept, and the preparation process is simple and easy to implement. The embodiment of the invention further provides a magnetic structure.

Spin-Hall nano-antenna (SHNA) devices are disclosed which leverage the inverse spin Hall effect and spin pumping to receive electromagnetic signals and convert them to electrical signals. Transmitter functionality is also enabled by exemplary SHNA devices. Some disclosed antennas are compatible with acoustic antenna functionalities but may also be configured to not include any acoustic functionalities. Omission of acoustic functionality requirements allows some embodiments to be fabricated on silicon wafers and hence become compatible with mainstream silicon technology. Directionality (radiation or reception patterns) of respective SHNA devices may be determined by use of different anisotropic shapes / geometries. Multiple SHNA can be fabricated on the same chip and made to radiate with different intensities in different directions for multiple-input-multiple-output (MIMO) functionality.

The present invention belongs to the technical field of two-dimensional magnetic materials, and relates to a method for regulating two-dimensional magnetic materials through small molecule chemical adsorption, including the following steps; Step 1, exfoliation and transfer of two-dimensional magnetic materials; Step 2, preparation of a solution of 7,7,8,8-tetracyanoquinodimethane (TCNQ); Step 3, surface spreading of TCNQ molecules. The present invention utilizes the adsorption of organic small molecules on the surface of two-dimensional materials to form an organic-inorganic hybrid composite, improving the comprehensive magnetic properties of the composite, solving the disadvantages of low Curie temperature and poor controllability of magnetic regulation of two-dimensional materials. The formed composite has a high Curie temperature and has broad application prospects in the field of spintronics.