Current vortices and magnetic fields driven by moving polar twin boundaries in ferroelastic materials  

作　　者：Guangming Lu Suzhi Li Xiangdong Ding Jun Sun Ekhard K.H.Salje 

机构地区：[1]State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China [2]Department of Earth Sciences,University of Cambridge,Cambridge CB23EQ,UK

出　　处：《npj Computational Materials》2020年第1期454-459,共6页计算材料学（英文）

基　　金：X.D.and J.S.are grateful to NSFC(51320105014,51621063)and the 111 project(BP 2018008)for financial support;E.K.H.S.is grateful to EPSRC(EP/P024904/1)for support;S.L.acknowledges the support from NKRDPC(2019YFA0307900).

摘　　要：Ferroelastic twin boundaries often have properties that do not exist in bulk,such as superconductivity,polarity etc.Designing and optimizing domain walls can hence functionalize ferroelastic materials.Using atomistic simulations,we report that moving domain walls have magnetic properties even when there is no magnetic element in the material.The origin of a robust magnetic signal lies in polar vortex structures induced by moving domain walls,e.g.,near the tips of needle domains and near domain wall kinks.These vortices generate displacement currents,which are the origin of magnetic moments perpendicular to the vortex plane.This phenomenon is universal for ionic crystals and holds for all ferroelastic domain boundaries containing dipolar moments.

关 键 词：magnetic MOVING walls 

分 类 号：TG14[一般工业技术—材料科学与工程]