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A graphene device producing spin polarization and its preparation method

A spin-polarized and graphene technology, which is applied in the manufacture/processing of Hall effect devices and electromagnetic devices, can solve the problems of difficult promotion, high cost, and low yield rate, and achieve easy promotion, low cost, and finished products. high rate effect

Active Publication Date: 2018-08-10
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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  • A graphene device producing spin polarization and its preparation method
  • A graphene device producing spin polarization and its preparation method
  • A graphene device producing spin polarization and its preparation method

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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 spin-polarized graphene device and a preparation method thereof. The present invention adopts the micromechanical exfoliation method to prepare single-layer graphene, selects the magnetic insulator nanosheet according to the horizontal size of the single-layer graphene, and transfers the magnetic insulator nanosheet to the single-layer graphene through the glass needle tip of the nanometer micromechanical micromanipulator. On the magnetic insulator nanosheets / graphene heterostructure; the electron beam resist sheet is pressed on the magnetic insulator nanosheets, so that the magnetic insulator nanosheets and single-layer graphene are more closely combined, which is conducive to the appearance of graphene. Spin polarization can also prevent graphene rupture caused by spin coating and improve yield; the invention combines the advantages of nanomaterials to facilitate the regulation of the coupling effect of single-layer graphene and magnetic insulator nanosheets, and improve graphene spin polarization High efficiency; at the same time, it has the advantages of low cost, high yield and easy promotion, achieving the purpose of convenient, efficient and flexible operation.

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...

Claims

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Application Information

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Patent Type & Authority Patents(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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