AUTHOR=Yao Xianglong , Wang Zhenyu , Deng Menghua , Li Z.-X. , Zhang Zhizhi , Cao Yunshan , Yan Peng TITLE=Magnetic Skyrmion Generation by Reflective Spin Wave Focusing JOURNAL=Frontiers in Physics VOLUME=9 YEAR=2021 URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2021.729967 DOI=10.3389/fphy.2021.729967 ISSN=2296-424X ABSTRACT=

We propose a method to generate magnetic skyrmions by focusing spin waves totally reflected by a curved film edge. The edge contour is derived to be parabolic and frequency-independent based on the identical magnonic path length principle. We performed micromagnetic simulations to verify our theoretical design. Under proper conditions, the reflected spin waves first converge at the focal point with the enhanced intensity leading to the emergence of magnetic droplets, which are then converted to magnetic skyrmion accompanied by a change in the topological charge. We numerically obtain the phase diagram of skyrmion generation with respect to the amplitude and frequency of the driving field. Our finding would be helpful for the design of spintronic devices combining the advantage of skyrmionics and magnonics.