Graphene device capable of realizing spin polarization and preparation method thereof

A technology of spin polarization and graphene, which is applied in the manufacture/processing of Hall effect devices and electromagnetic devices, can solve the problems of low yield, high cost, and difficult promotion, and achieve high yield, low cost, The effect of easy promotion

Active Publication Date: 2017-02-22
PEKING UNIV
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Problems solved by technology

[0005] In view of the problems existing in the above prior art, the spin-polarized graphene device and its preparation method solve the problems of high cost, low yield and difficulty in popularization of the prior art, and achieve the purpose of convenient, efficient and flexible operation

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  • Graphene device capable of realizing spin polarization and preparation method thereof
  • Graphene device capable of realizing spin polarization and preparation method thereof
  • Graphene device capable of realizing spin polarization and preparation method thereof

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Embodiment Construction

[0037] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.

[0038] The physical mechanism of the present invention: the magnetic insulator nanosheet and graphene form a heterogeneous structure, and the hybridization of the electron orbit of the magnetic atom in the magnetic insulator nanosheet and the π electron orbit of graphene is the source of the magnetic proximity at the interface. Through the magnetic proximity of the magnetic insulator, an exchange field is induced on the graphene, which causes the Zeeman splitting of the graphene to cause spin polarization. Such as figure 1 As shown in (a), the spin-up and down energy bands of initial graphene are degenerate; when there is a Zeeman splitting as figure 1 As shown in (b), the graphene spin-up and spin-down energy bands move in opposite directions, respectively. When there is no external magnetic field, the Zeeman splitting energy gap at this time...

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Abstract

The invention discloses a graphene device capable of realizing spin polarization and a preparation method thereof. According to the graphene device and the preparation method thereof, single-layer graphene is prepared by adopting a micromechanical cleavage method, and a magnetic insulator nanosheet is selected according to the horizontal dimension of the single-layer graphene, and is transferred onto the single-layer graphene to form a magnetic insulator nanosheet / graphene heterogeneous structure through a glass needle of a nanometer micromechanical micromanipulation platform; an electron resist sheet is pressed above the magnetic insulator nanosheet, so that the magnetic insulator nanosheet can be combined with the single-layer graphene more closely, spin polarization of the graphene is facilitated, graphene breakage caused by spin coating can also be prevented, and the yield is improved; the advantages of a nanometer material are combined, so that the coupling effect of the single-layer graphene and the magnetic insulator nanosheet can be conveniently regulated and controlled, and the spin polarization efficiency of the graphene is improved; in addition, the device has the advantages of low cost, high yield and easiness for popularization, and the aim of convenient, efficient and flexible operation is fulfilled.

Description

technical field [0001] The invention relates to graphene spin polarization technology, in particular to a device for generating graphene spin polarization and a preparation method thereof. Background technique [0002] As a natural two-dimensional material, graphene has excellent physical, chemical and mechanical properties, such as high electrical conductivity, high electron mobility, high thermal conductivity, high hardness, and the characteristics of adjustable carrier concentration. The micron spin transport coherent diffusion length makes graphene a very promising building block material for spintronics. Graphene can be used as a conductive channel in spintronics applications to transmit spin-polarized currents. For example, researchers have constructed spin valves with ferromagnetic metal / graphene / ferromagnetic metal sandwich structures, which can be injected into graphene spin polarized current. However, the conductance mismatch between ferromagnetic materials and g...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L43/06H01L43/14
CPCH10N52/00H10N52/01
Inventor 廖志敏吴燕飞俞大鹏
Owner PEKING UNIV
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