Polarizability of electrically induced magnetic vortex plasma

Article

关键词: PHASE-TRANSITIONS;    DOMAIN-WALLS;    MULTIFERROICS;    FIELD;    SKYRMIONS;   

DOI  :  10.1103/PhysRevB.95.195136

来源: SCIE

【 摘 要 】

Electric field control of magnetic structures, particularly topological defects in magnetoelectric materials, has drawn a great deal of attention in recent years, which has led to experimental success in creation and manipulation by an electric field of single magnetic defects, such as domain walls and skyrmions. In this work we explore a scenario of electric field creation of another type of topological defect, magnetic vortices and antivortices, which are characteristic of materials with easy-plane (XY) symmetry. Each magnetic (anti) vortex in magnetoelectric materials (such as type-II multiferroics) possesses a quantized magnetic and an electric charge, where the former is responsible for interaction between vortices and the latter couples the vortices to an electric field. This property of magnetic vortices opens a peculiar possibility of creation of magnetic vortex plasma by nonuniform electric fields. We show that the electric field, created by a cantilever tip, produces a magnetic atom with a localized spatially ordered spot of vortices (nucleus of the atom) surrounded by antivortices (electronic shells). We analytically find the vortex density distribution profile and temperature dependence of polarizability of this structure and confirm it numerically. We show that electric polarizability of the magnetic atom depends on temperature as alpha similar to 1/T1-eta (eta > 0), which is consistent with Euclidean random matrix theory prediction.

【 授权许可】

Free