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Nat Mater. 2019 Jul;18(7):685-690. doi: 10.1038/s41563-019-0380-x. Epub 2019 May 27.

Bulk Dzyaloshinskii-Moriya interaction in amorphous ferrimagnetic alloys.

Author information

1
Institute for Chemical Research, Kyoto University, Kyoto, Japan. uzes.physics@gmail.com.
2
Institute for Chemical Research, Kyoto University, Kyoto, Japan.
3
KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, Republic of Korea.
4
Department of Materials Science & Engineering, Korea University, Seoul, Republic of Korea.
5
Department of Physics and Institute of Applied Physics, Seoul National University, Seoul, Republic of Korea.
6
Center for Spintronics, Korea Institute of Science and Technology, Seoul, Republic of Korea.
7
College of Science and Technology, Nihon University, Funabashi, Chiba, Japan.
8
Department of Physics, University of Ulsan, Ulsan, Republic of Korea.
9
Institute for Chemical Research, Kyoto University, Kyoto, Japan. ono@scl.kyoto-u.ac.jp.
10
Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University, Osaka, Japan. ono@scl.kyoto-u.ac.jp.

Abstract

Symmetry breaking is a fundamental concept that prevails in many branches of physics1-5. In magnetic materials, broken inversion symmetry induces the Dzyaloshinskii-Moriya interaction (DMI), which results in fascinating physical behaviours6-14 with the potential for application in future spintronic devices15-17. Here, we report the observation of a bulk DMI in GdFeCo amorphous ferrimagnets. The DMI is found to increase linearly with an increasing thickness of the ferrimagnetic layer, which is a clear signature of the bulk nature of DMI. We also found that the DMI is independent of the interface between the heavy metal and ferrimagnetic layer. This bulk DMI is attributed to an asymmetric distribution of the elemental content in the GdFeCo layer, with spatial inversion symmetry broken throughout the layer. We expect that our experimental identification of a bulk DMI will open up additional possibilities to exploit this interaction in a wide range of materials.

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PMID:
31133731
DOI:
10.1038/s41563-019-0380-x

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