Method for driving magnetic skyrmion

Abstract

The invention relates to a method for driving a magnetic skyrmion. The method comprises the following steps: forming the Neel type magnetic skyrmion in a film; applying a vortex light field with a target frequency to the cylindrical ferromagnetic material to excite vortex spin waves in a target mode; and propagating the vortex spin waves into the film through the interlayer coupling effect betweenmaterials in order to drive the Neel type magnetic skyrmion to move. The problem of transverse drifting motion caused by the Hall effect of the skyrmion can be effectively solved, the problem of joule heat can be avoided by using the spin waves to drive skyrmion, and the loss in the information transmission process is effectively reduced. The magnetic skyrmion can be driven to climb over the defects of a large scale through the spin waves under the condition that the material has defects, and then the purpose of accurately controlling the magnetic skyrmion is achieved. In addition, compared with the rotational motion of the magnetic skyrmion driven by twisted photons (optical vortexes), the method is easier to implement.

Description

technical field [0001] The invention belongs to the field of spin electronic devices, and in particular relates to a method for driving magnetic skyrmions. Background technique [0002] Magnetic skyrmions are quasi-particle properties and topologically protected spin structures, which have the advantages of small size, high stability, and low power consumption, making them core candidate materials for magnetic information storage and spintronic devices , has received extensive attention in recent years. At the same time, its manipulation methods are also diverse. Studies have found that magnetic skyrmions can be driven by spin-polarized currents, electric field gradients, magnetic fields, and temperature gradients. At present, spin-polarized current is still the mainstream method to drive the motion of magnetic skyrmions. [0003] When the current drives the magnetic skyrmion to move, due to the existence of the magnetic skyrmion Hall effect, that is, the topological struc...

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Problems solved by technology

[0003] When the current drives the magnetic skyrmion to move, due to the existence of the magnetic skyrmion Hall effect, that is, the topological structure will be affected by the Magnus force, so it will generate a velocity perpendicular to the direction of the current, resulting in lateral drift Movement, which in turn causes magnetic skyrmions to accumulate at the edge of the device, which causes problems in data transmission and ultimately negatively affects the normal operation of the device

At the same time, due to the defects in the device preparation, the magnetic skyrmions are affected by the defects during the movement process, or are pinned or annihilated, which also adversely affects the actual work of the device.

Recently, it has been proposed that twisted photons (optical vortices) can drive the rotational motion of magnetic skyrmions, which can avoid the influence of material defects, but this motion is limited by the diffraction limit, making it difficult to achieve

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