Resonant properties of dipole skyrmions in amorphous Fe/Gd multilayers

作     者：S. A. Montoya S. Couture J. J. Chess J. C. T. Lee N. Kent M.-Y. Im S. D. Kevan P. Fischer B. J. McMorran S. Roy V. Lomakin E. E. Fullerton 

作者机构：Center for Memory and Recording Research University of California San Diego La Jolla California 92093 USA Department of Electrical and Computer Engineering University of California San Diego La Jolla California 92093 USA Space and Naval Warfare Systems Center - Pacific San Diego California 92152 USA Department of Physics University of Oregon Eugene Oregon 97401 USA Center for X-Ray Optics Lawrence Berkeley National Laboratory Berkeley California 94720 USA Physics Department University of California Santa Cruz California 94056 USA Department of Emerging Materials Science Daegu Gyeongbuk Institute of Science and Technology Daegu Korea Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA 

出 版 物：《Physical Review B》 (Phys. Rev. B)

年 卷 期：2017年第95卷第22期

页      面：224405-224405页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Office of Basic Energy Sciences US Department of Energy University of California-San U.S. Department of Energy, USDOE Office of Science, SC, (DE-AC02-05CH11231, DE-SC0010466) Basic Energy Sciences, BES, (DE-SC0003678) 

主　　题：Magnetic susceptibility Magnetism Micromagnetism Skyrmions Spin waves 

摘      要：The dynamic response of dipole skyrmions in Fe/Gd multilayer films is investigated by ferromagnetic resonance measurements and compared to micromagnetic simulations. We detail thickness- and temperature-dependent studies of the observed modes as well as the effects of magnetic field history on the resonant spectra. Correlation between the modes and the magnetic phase maps constructed from real-space imaging and scattering patterns allows us to conclude that the resonant modes arise from local topological features such as dipole skyrmions but do not depend on the collective response of a close-packed lattice of these chiral textures. Using micromagnetic modeling, we are able to quantitatively reproduce our experimental observations which suggests the existence of localized spin-wave modes that are dependent on the helicity of the dipole skyrmion. We identify four localized spin-wave excitations for the skyrmions that are excited under either in-plane or out-of-plane rf fields. Lastly we show that dipole skyrmions and nonchiral bubble domains exhibit qualitatively different localized spin-wave modes.