Chiral bobbers and skyrmions in epitaxial FeGe/Si(111) films

被引：60

作者：

Ahmed, Adam S. ^{[1
]}

Rowland, James ^{[1
]}

Esser, Bryan D. ^{[2
,3
]}

Dunsiger, Sarah R. ^{[4
,5
]}

McComb, David W. ^{[2
,3
]}

Randeria, Mohit ^{[1
]}

Kawakami, Roland K. ^{[1
]}

机构：

[1] Ohio State Univ, Dept Phys, 174 W 18th Ave, Columbus, OH 43210 USA

[2] Ohio State Univ, Ctr Electron Microscopy & Anal, Columbus, OH 43210 USA

[3] Ohio State Univ, Dept Mat Sci & Engn, 116 W 19Th Ave, Columbus, OH 43210 USA

[4] Ohio State Univ, Ctr Emergent Mat, Columbus, OH 43210 USA

[5] Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada

来源：

PHYSICAL REVIEW MATERIALS | 2018年 / 2卷 / 04期

基金：

美国国家科学基金会;

关键词：

MAGNETIC SKYRMIONS;

D O I：

10.1103/PhysRevMaterials.2.041401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report experimental and theoretical evidence for the formation of chiral bobbers-an interfacial topological spin texture-in FeGe films grown by molecular beam epitaxy. After establishing the presence of skyrmions in FeGe/Si(111) thin-film samples through Lorentz transmission electron microscopy and the topological Hall effect, we perform magnetization measurements that reveal an inverse relationship between the film thickness and the slope of the susceptibility (d chi/dH). We present evidence for the evolution as a function of film thickness L from a skyrmion phase for L < L-D/2 to a cone phase with chiral bobbers at the interface for L > L-D/2, where L-D similar to 70 nm is the FeGe pitch length. We show using micromagnetic simulations that chiral bobbers, earlier predicted to be metastable, are in fact the stable ground state in the presence of an additional interfacial Rashba Dzyaloshinskii-Moriya interaction.

引用

页数：6

共 35 条

[1] Long-Wavelength Helimagnetic Order and Skyrmion Lattice Phase in Cu2OSeO3 [J].