The Effect Of Easy Axis Orientation On Skyrmion In Nanodisk

Skyrmion is a special spin structure,which mainly exists in the asymmetric chiral magnetic material and the symmetry broken magnetic film material.It has the advantages of small size,easy to be driven by current,low energy consumption and so on.It is a core candidate material for magnetic information storage and spin electronics devices.With the development of topological magnetism and spintronics,the research of electronic memory devices based on skyrmion is the focus of Micromagnetism.Skyrmion is promising to replace ferromagnetic domains as a carrier of digital information.Scientists urgently need to find materials that can produce smaller sizes of skyrmion at room temperature,because the smaller the skyrmion size,the smaller the equilibrium distance between adjacent skyrmion,the greater the storage density of magnetic materials.In this thesis,We change the direction of easy axis and simulate the creation of skyrmion in ultrathin film nano disk.We investigate the influence of the direction of easy axison the size and shape of skyrmion.The creation and annihilation of skyrmion can be realized by changing the direction of easy axis.In addition,we found that the shape of skyrmion is no longer completely centrosymmetric,that is,the symmetry is broken.We analyze the reason of the above phenomenon from the energy,give a new definition of the radius of skyrmionaccording to our needs,andapproximate the size of skyrmion.This work is convenient to understand the distribution of magnetization in this state,and provides a reference for the theoretical study of magnetic skyrmion.As an information carrier,we also study the influence of easy axis on the equilibrium distance of skyrmion.We propose that changing the direction of anisotropy can increase the density of information storage and provide reference for the research of electronic memory devices based on skyrmion.