Resonant properties of dipole skyrmions in amorphous Fe/Gd multilayers

被引：45

作者：

Montoya, S. A. ^{[1
,2
,3
]}

Couture, S. ^{[1
,2
]}

Chess, J. J. ^{[4
]}

Lee, J. C. T. ^{[4
,5
]}

Kent, N. ^{[5
,6
]}

Im, M. -Y. ^{[5
,7
]}

Kevan, S. D. ^{[4
,5
]}

Fischer, P. ^{[6
,8
]}

McMorran, B. J. ^{[4
]}

Roy, S. ^{[5
]}

Lomakin, V. ^{[1
,2
]}

Fullerton, E. E. ^{[1
,2
]}

机构：

[1] Univ Calif San Diego, Ctr Memory & Recording Res, La Jolla, CA 92093 USA

[2] Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA

[3] Space & Naval Warfare Syst Ctr Pacific, San Diego, CA 92152 USA

[4] Univ Oregon, Dept Phys, Eugene, OR 97401 USA

[5] Lawrence Berkeley Natl Lab, Ctr Xray Opt, Berkeley, CA 94720 USA

[6] Univ Calif Santa Cruz, Phys Dept, Santa Cruz, CA 94056 USA

[7] Daegu Gyeongbuk Inst Sci & Technol, Dept Emerging Mat Sci, Daegu, South Korea

[8] Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW B | 2017年 / 95卷 / 22期

基金：

新加坡国家研究基金会;

关键词：

MAGNETIC SKYRMIONS; ROOM-TEMPERATURE; THIN-FILMS; PERMEABILITY; DYNAMICS; FIELD;

D O I：

10.1103/PhysRevB.95.224405

中图分类号：

T [工业技术];

学科分类号：

08 ;

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.

引用

页数：13

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