Transitions between skyrmion- and hedgehog-lattice states in cubic chiral magnets MnSi<sub>1-<i>x</i></sub>Ge<i><sub>x</sub></i>

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