Dense skyrmion crystal stabilized through interfacial exchange coupling:Role of in-plane anisotropy

• 作者: Ming-Xiu Sui Zi-Bo Zhang Xiao-Dan Chi Jia-Yu Zhang Yong Hu
• 来源期刊: 物理学前沿
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: Quantum Computation & Quantum Information;Atomic,Molecular & Optical Physics
• 页码范围: 104-111
• 页数: 8页
• 语种: 英文

摘要

A Monte Carlo simulated-annealing algorithm was used to study the magnetic state in an in-plane helimagnet layer on triangular lattice that exchange couples to an underlayer with strong out-of-plane anisotropy.In the single helimagnet layer with in-plane anisotropy(K),the formation of labyrinth-like domains with local spin spirals,instead of parallel stripes,is favored,and these domains rapidly transform into dense skyrmion crystals with increasing interfacial exchange coupling(J'),equivalent to a virtual magnetic field,and finally evolve to an out-of-plane uniform state at large enough J'.Moreover,with increasing K,the skyrmion crystal state can vary from regular 6-nearest-neighboring circular skyrmion arrangement to irregular squeezed skyrmions with less than 6 nearest neighbors when the in-plane anisotropy energy is higher than the interfacial exchange energy as the skyrmion number is maximized.Finally,we demonstrated that the antiferromagnetic underlayer cannot induce skyrmions while the chirality inversion can be achieved on top of an out-of-plane magnetization underlayer with 180° domain walls,supporting the experimental findings in FeGe thin film.This compelling advantage offers a fertile playground for exploring emergent phenomena that arise from interfacing magnetic skyrmions with additional functionalities.