Correlation of the Dzyaloshinskii–Moriya interaction with Heisenberg exchange and orbital asphericity

Sanghoon Kim (), Kohei Ueda, Gyungchoon Go, Peong-Hwa Jang, Kyung-Jin Lee, Abderrezak Belabbes, Aurelien Manchon, Motohiro Suzuki, Yoshinori Kotani, Tetsuya Nakamura, Kohji Nakamura, Tomohiro Koyama, Daichi Chiba, Kihiro. T. Yamada, Duck-Ho Kim, Takahiro Moriyama, Kab-Jin Kim and Teruo Ono ()
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Sanghoon Kim: Kyoto University
Kohei Ueda: Kyoto University
Gyungchoon Go: Korea University
Peong-Hwa Jang: Korea University
Kyung-Jin Lee: Korea University
Abderrezak Belabbes: King Abdullah University of Science and Technology (KAUST)
Aurelien Manchon: King Abdullah University of Science and Technology (KAUST)
Motohiro Suzuki: Japan Synchrotron Radiation Research Institute (JASRI)
Yoshinori Kotani: Japan Synchrotron Radiation Research Institute (JASRI)
Tetsuya Nakamura: Japan Synchrotron Radiation Research Institute (JASRI)
Kohji Nakamura: Mie University
Tomohiro Koyama: The University of Tokyo
Daichi Chiba: The University of Tokyo
Kihiro. T. Yamada: Kyoto University
Duck-Ho Kim: Kyoto University
Takahiro Moriyama: Kyoto University
Kab-Jin Kim: Kyoto University
Teruo Ono: Kyoto University

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract Chiral spin textures of a ferromagnetic layer in contact to a heavy non-magnetic metal, such as Néel-type domain walls and skyrmions, have been studied intensively because of their potential for future nanomagnetic devices. The Dyzaloshinskii–Moriya interaction (DMI) is an essential phenomenon for the formation of such chiral spin textures. In spite of recent theoretical progress aiming at understanding the microscopic origin of the DMI, an experimental investigation unravelling the physics at stake is still required. Here we experimentally demonstrate the close correlation of the DMI with the anisotropy of the orbital magnetic moment and with the magnetic dipole moment of the ferromagnetic metal in addition to Heisenberg exchange. The density functional theory and the tight-binding model calculations reveal that inversion symmetry breaking with spin–orbit coupling gives rise to the orbital-related correlation. Our study provides the experimental connection between the orbital physics and the spin–orbit-related phenomena, such as DMI.

Date: 2018
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DOI: 10.1038/s41467-018-04017-x

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