Thickness dependence of the interfacial Dzyaloshinskii–Moriya interaction in inversion symmetry broken systems

Jaehun Cho, Nam-Hui Kim, Sukmock Lee, June-Seo Kim (), Reinoud Lavrijsen, Aurelie Solignac, Yuxiang Yin, Dong-Soo Han, Niels J. J. van Hoof, Henk J. M. Swagten, Bert Koopmans and Chun-Yeol You ()
Additional contact information
Jaehun Cho: Inha University
Nam-Hui Kim: Inha University
Sukmock Lee: Inha University
June-Seo Kim: Center for NanoMaterials, Eindhoven University of Technology
Reinoud Lavrijsen: Center for NanoMaterials, Eindhoven University of Technology
Aurelie Solignac: Center for NanoMaterials, Eindhoven University of Technology
Yuxiang Yin: Center for NanoMaterials, Eindhoven University of Technology
Dong-Soo Han: Center for NanoMaterials, Eindhoven University of Technology
Niels J. J. van Hoof: Inha University
Henk J. M. Swagten: Center for NanoMaterials, Eindhoven University of Technology
Bert Koopmans: Center for NanoMaterials, Eindhoven University of Technology
Chun-Yeol You: Inha University

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract In magnetic multilayer systems, a large spin-orbit coupling at the interface between heavy metals and ferromagnets can lead to intriguing phenomena such as the perpendicular magnetic anisotropy, the spin Hall effect, the Rashba effect, and especially the interfacial Dzyaloshinskii–Moriya (IDM) interaction. This interfacial nature of the IDM interaction has been recently revisited because of its scientific and technological potential. Here we demonstrate an experimental technique to straightforwardly observe the IDM interaction, namely Brillouin light scattering. The non-reciprocal spin wave dispersions, systematically measured by Brillouin light scattering, allow not only the determination of the IDM energy densities beyond the regime of perpendicular magnetization but also the revelation of the inverse proportionality with the thickness of the magnetic layer, which is a clear signature of the interfacial nature. Altogether, our experimental and theoretical approaches involving double time Green’s function methods open up possibilities for exploring magnetic hybrid structures for engineering the IDM interaction.

Date: 2015
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DOI: 10.1038/ncomms8635

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