Ultrafast laser-driven topological spin textures on a 2D magnet

作     者：Mara Strungaru Mathias Augustin Elton J.G.Santos 

作者机构：Institute for Condensed Matter Physics and Complex SystemsSchool of Physics and AstronomyThe University of EdinburghEdinburghEH93FDUK Donostia International Physics Center(DIPC)20018Donostia-San SebastiánBasque CountrySpain Higgs Centre for Theoretical PhysicsThe University of EdinburghEdinburghEH93FDUK 

出 版 物：《npj Computational Materials》 (计算材料学（英文）)

年 卷 期：2022年第8卷第1期

页      面：1630-1635页

核心收录：

学科分类：08[工学] 0703[理学-化学] 0803[工学-光学工程] 0701[理学-数学] 0702[理学-物理学] 

基　　金：E.J.G.S.acknowledges computational resources through CIRRUS Tier-2 HPC Service(ec131 Cirrus Project)at EPCC funded by the University of Edinburgh and EPSRC(EP/P020267/1) ARCHER UK National Supercomputing Service(http://www.archer.ac.uk)via Project d429,and the UKCP consortium(Project e89)funded by EPSRC grant ref EP/P022561/1 EJGS acknowledge the Spanish Ministry of Science’s grant program“Europa-Excelencia”under grant number EUR2020-112238,the EPSRC Early Career Fellowship(EP/T021578/1) the University of Edinburgh for funding support. 

主　　题：laser excitation topological 

摘      要：Ultrafast laser excitations provide an efficient and low-power consumption alternative since different magnetic properties and topological spin states can be triggered and manipulated at the femtosecond(fs)regime.However,it is largely unknown whether laser excitations already used in data information platforms can manipulate the magnetic properties of recently discovered two-dimensional(2D)van der Waals(vdW)materials.Here we show that ultrashort laser pulses(30−85 fs)can not only manipulate magnetic domains of 2D-XY CrCl_(3)ferromagnets,but also induce the formation and control of topological nontrivial meron and antimeron spin textures.We observed that these spin quasiparticles are created within~100 ps after the excitation displaying rich dynamics through motion,collision and annihilation with emission of spin waves throughout the surface.Our findings highlight substantial opportunities of using photonic driving forces for the exploration of spin textures on 2D magnetic materials towards magneto-optical topological applications.