Interfacial Dzyaloshinskii-Moriya interaction in nonmagnetic/noncollinear-antiferromagnetic bilayers
ORAL
Abstract
Dzyaloshinskii-Moriya interaction (DMI), an antisymmetric spin-spin exchange interaction resulting from spatial inversion breaking, plays fundamental roles in a variety of phenomena. The effects of DMI are widely studied in nonmagnetic/magnetic bilayers, where interfacial DMI (i-DMI) arises due to the breaking of inversion symmetry at the interface.
We present our theoretical formulation of the i-DMI for a nonmagnetic/noncollinear-AFM bilayer. Here, noncollinear AFMs refer to frustrated kagome AFMs, such as D019-Mn3Sn [1], that show a triangular magnetic order. In the emerging research field of antiferromagnetic spintronics [2], noncollinear AFMs are expected to play pivotal roles [3]. Recent successes in epitaxial growth of Mn3Sn [4] have propelled studies on noncollinear AFM thin films that are most often attached to some adjacent nonmagnetic films. There lacks, however, a theoretical framework to quantitatively and systematically study physical implications of the i-DMI in such systems.
In this work, we find that the i-DMI provides a sublattice-asymmetric renormalization to the bulk DMI, the latter being present due to the locally-broken inversion symmetry of the hexagonal Kagome lattice structure. As a consequence of this i-DMI, a uniaxial anisotropy for the AFM order parameter with respect to the film normal direction is predicted to emerge. Our analytical predictions are supported by numerical simulations.
We present our theoretical formulation of the i-DMI for a nonmagnetic/noncollinear-AFM bilayer. Here, noncollinear AFMs refer to frustrated kagome AFMs, such as D019-Mn3Sn [1], that show a triangular magnetic order. In the emerging research field of antiferromagnetic spintronics [2], noncollinear AFMs are expected to play pivotal roles [3]. Recent successes in epitaxial growth of Mn3Sn [4] have propelled studies on noncollinear AFM thin films that are most often attached to some adjacent nonmagnetic films. There lacks, however, a theoretical framework to quantitatively and systematically study physical implications of the i-DMI in such systems.
In this work, we find that the i-DMI provides a sublattice-asymmetric renormalization to the bulk DMI, the latter being present due to the locally-broken inversion symmetry of the hexagonal Kagome lattice structure. As a consequence of this i-DMI, a uniaxial anisotropy for the AFM order parameter with respect to the film normal direction is predicted to emerge. Our analytical predictions are supported by numerical simulations.
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Publication: [1] S. Tomiyoshi and Y. Yamaguchi, J. Phys. Soc. Jpn. 51, 2478 (1982).<br>[2] T. Jungwirth et al., Nat. Nanotechnol. 11, 231 (2016); V. Baltz et al., Rev. Mod. Phys. 90, 015005 (2018).<br>[3] S. Nakatsuji et al., Nature 527, 212 (2015); Y. Takeuchi et al., Nat. Mater. 20, 1364 (2021); T. Higo et al., Nature 607, 474 (2022).<br>[4] A. Markou et al., Phys. Rev. Mater. 2, 051001(R) (2018); J. Yoon et al., Appl. Phys. Exp. 13, 013001 (2019).
Presenters
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Yuta Yamane
Tohoku University, Japan
Authors
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Yuta Yamane
Tohoku University, Japan
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Yasufumi Araki
Japan Atomic Energy Agency
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Shunsuke Fukami
Tohoku University, Japan