Comparative study of topological Hall effect and skyrmions in NiMnIn and NiMnGa

被引：29

作者：

Zhang, Wenyong ^{[1
,2
]}

Balasubramanian, Balamurugan ^{[1
,2
]}

Ullah, Ahsan ^{[1
,2
]}

Pahari, Rabindra ^{[1
,2
]}

Li, Xingzhong ^{[1
]}

Yue, Lanping ^{[1
]}

Valloppilly, Shah R. ^{[1
]}

Sokolov, Andrei ^{[1
]}

Skomski, Ralph ^{[1
,2
]}

Sellmyer, David J. ^{[1
,2
]}

机构：

[1] Univ Nebraska, Nebraska Ctr Mat & Nanosci, Lincoln, NE 68588 USA

[2] Univ Nebraska, Dept Phys & Astron, Lincoln, NE 68588 USA

来源：

APPLIED PHYSICS LETTERS | 2019年 / 115卷 / 17期

基金：

美国国家科学基金会;

关键词：

ROOM-TEMPERATURE;

D O I：

10.1063/1.5120406

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A nonequilibrium rapid-quenching method has been used to fabricate NiMnIn and NiMnGa alloys that are chemically and morphologically similar but crystallographically and physically very different. NiMnGa crystallizes in a Ni2In-type hexagonal structure, whereas NiMnIn is a cubic Heusler alloy. Both alloys yield a topological Hall effect contribution corresponding to bubble-type skyrmion spin structures, but it occurs in much lower magnetic fields in NiMnIn as compared to NiMnGa. The effect is unrelated to net Dzyaloshinskii-Moriya interactions, which are absent in both alloys due to their inversion-symmetric crystal structures. Based on magnetic-force microscopy, we explain the difference between the two alloys by magnetocrystalline anisotropy and uniaxial and cubic anisotropies yielding full-fledged and reduced topological Hall effects, respectively. Since NiMnIn involves small magnetic fields (0.02-0.3 kOe) at and above room temperature, it is of potential interest in spin electronics. Published under license by AIP Publishing.

引用

页数：4

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