A method of driving a magnetic skyrmion motion

Abstract

The invention provides a method for driving magnetic skyrmion motion. The method comprises, by applying a linear Laguerre-Gaussian vortex optical field and optical orbit angular momentum transfer on askyrmion on a ferromagnetic thin film or an antiferromagnetic thin film. to achieve the transport of skyrmion. Compared with the current-driven skyrmion method in the prior art This method allows skyrmionto flip over large-scale defects to avoid being trapped by defects, At the same time, the magnetic structure is not destroyed, the Hall effect of the skyrmion is effectively avoid, the speed of the skyrmion is fast, the operation method is simple, and the movement speed of the skyrmion on the antiferromagnetic thin film is faster than that on the ferromagnetic thin film, which is very meaningful for improving the data transmission speed of the memory device.

Description

technical field [0001] The invention belongs to the technical field of magneto-optical devices, and in particular relates to a method for manipulating the motion of magnetic skyrmions by linear Laguerre-Gaussian vortex light through orbital angular momentum transfer. Background technique [0002] Magnetic skyrmions are quasi-particle properties and topologically protected spin structures, which have the characteristics of small size and high stability. Because its existence can correspond to the "1" and "0" of information records, it has broad application prospects in spintronics related fields such as race track memory and logic devices. The manipulation method of magnetic skyrmions is also very important. Studies have found that magnetic skyrmions can be driven by spin-polarized currents, electric field gradients, magnetic fields, temperature gradients, and spin waves. Currently, spin-polarized currents It is still the mainstream means to drive the motion of magnetic skyr...

AI Technical Summary

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 leads to the accumulation of magnetic skyrmions at the edge of the device, which eventually has a negative impact on 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.

Images