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Preparing method for two-dimensional skyrmion crystal

A technology of crystal and crystal structure, applied in the field of preparation of new magnetic materials

Inactive Publication Date: 2015-12-16
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention, the problem to be solved is to prepare a kind of artificial two-dimensional skyrmion crystal

Method used

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  • Preparing method for two-dimensional skyrmion crystal
  • Preparing method for two-dimensional skyrmion crystal
  • Preparing method for two-dimensional skyrmion crystal

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Embodiment Construction

[0015] As shown in Figure 2(a), a cobalt-platinum alloy thin film (dark gray layer) was grown on a silicon wafer (khaki layer) by magnetron sputtering, and then formed by ultraviolet lithography combined with electron beam growth. The edge-cut cobalt disk is placed on the cobalt-platinum alloy film.

[0016] In order to unify the magnetization direction of the central part of the cobalt disk and its surroundings to the direction shown in Figure 2(b), a large external magnetic field (0.2-0.5T) can be applied in the direction perpendicular to the film, so that Align in the same direction as the surrounding magnetization direction (up or down perpendicular to the film surface). Then, using the different switching magnetic fields of the central and surrounding magnetizations, an appropriate reverse external magnetic field (0.05-0.1T) perpendicular to the direction of the film is applied, so that one of the central and surrounding magnetization directions is reversed while the othe...

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Abstract

The invention discloses a preparing method for a two-dimensional skyrmion crystal. Nanometer magnetic discs are directly put on the upper surface of a perpendicular anisotropic material, and a skyrmion crystal structure is obtained through the competition of interaction of demagnetization energy, exchange energy and anisotropic performance between magnetic materials. Especially, a cobaltic nanometer magnetic disc array is put on the plane of a cobalt and platinum alloy, and the magnetized rotating directions of all the magnetic discs of the nanometer magnetic disc array are unified through the method of applying combined magnetic fields which are parallel to the surface of a film and perpendicular to each other.

Description

technical field [0001] The invention relates to a preparation method of a novel magnetic material. Background technique [0002] Skyrmions are a special structure in magnetic materials (such as figure 1 ). It has been found that skyrmion crystals composed of skyrmion arrays not only have topologically related transport behavior, but also can drive skyrmion motion through current, and even rotate skyrmion when there is a temperature gradient. Compared with the current-driven domain wall motion in the track memory, the critical current driving skyrmions is 5-6 orders of magnitude smaller than the former, which greatly reduces energy consumption and is more conducive to practical applications. In addition, skyrmion crystals also exhibit very interesting dynamic behaviors. The in-plane AC magnetic field can excite its two precession modes, which are counterclockwise and clockwise modes; the out-of-plane AC magnetic field can excite the breathing mode. Therefore, skymin crysta...

Claims

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Application Information

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IPC IPC(8): H01F41/18H01F41/30
Inventor 孙亮缪冰锋丁海峰
Owner NANJING UNIV
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