Transitions between skyrmion- and hedgehog-lattice states in cubic chiral magnets MnSi1-xGex

ORAL

Abstract

Topological spin textures such as magnetic skyrmions and spin hedgehogs show novel emergent phenomena, which can be exploited for spintronic functionalities. Whereas the formation or deletion of them has been intensively studied so far, switching of spin textures among different topologically-nontrivial classes remains largely unexplored.
We report on transitions between skyrmion- and hedgehog-lattice states in cubic chiral magnets MnSi1-xGex with variation of lattice constant controlled by Si/Ge substitution. By combining neutron scattering, Lorentz transmission electron microscopy and high-field transport measurements, we observe three different topological spin textures: skyrmion lattice in x = 0-0.25 as well as two distinct hedgehog lattices in x = 0.3-0.7 and x = 0.8-1, as respectively characterized by large topological Hall effects.
The emergence of various topological spin states in the chemical-pressure-controlled materials suggests a new route for direct manipulation of the spin-texture topology by a simple mechanical method such as pressure.

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Presenters

  • Yukako Fujishiro

    University of Tokyo

Authors

  • Yukako Fujishiro

    University of Tokyo

  • Naoya Kanazawa

    University of Tokyo

  • Taro Nakajima

    RIKEN Center for Emergent Matter Science, RIKEN CEMS, Center for Emergent Matter Science (CEMS), RIKEN

  • Xiuzhen Yu

    RIKEN Center for Emergent Matter Science, CEMS, RIKEN

  • Kazuki Ohishi

    Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society

  • Yukihiko Kawamura

    Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society

  • Kazuhisa Kakurai

    CROSS, Comprehensive Research Organization for Science and Society (CROSS), Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society

  • Takahisa Arima

    University of Tokyo

  • Hiroyuki Mitamura

    University of Tokyo

  • Atsushi Miyake

    University of Tokyo, Institute of Solid State Physics (ISSP), Univ. of Tokyo, Kashiwa, Japan.

  • Kazuto Akiba

    Okayama University, University of Tokyo, Institute of Solid State Physics (ISSP), Univ. of Tokyo, Kashiwa, Japan.

  • Masashi Tokunaga

    University of Tokyo, Institute of Solid State Physics (ISSP), Univ. of Tokyo, Kashiwa, Japan.

  • Akira Matsuo

    The Institute for Solid State Physics, University of Tokyo, University of Tokyo

  • Koichi Kindo

    ISSP, Tokyo University, University of Tokyo

  • Takashi Koretsune

    Tohoku University

  • Ryotaro Arita

    RIKEN, RIKEN Center for Emergent Matter Science, Department of Applied Physics and Quantum-Phase Electronics Center, University of Tokyo, University of Tokyo, University of Tokyo and RIKEN CEMS

  • Yoshinori Tokura

    RIKEN Center for Emergent Matter Science (CEMS), RIKEN Center for Emergent Matter Science, RIKEN CEMS, RIKEN Center for Emergent Matter Science (CEMS), Wako, Japan, Center for Emergent Matter Science (CEMS), RIKEN, Department of Applied Physics and Quantum-Phase Electronics Center, University of Tokyo, University of Tokyo, University of Tokyo and RIKEN CEMS, CEMS, RIKEN, Center for Emergent Matter Science, RIKEN, Department of Applied Physics, University of Tokyo, University of Tokyo and RIKEN-CEMS