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    Phase-transition kinetics of magnetic skyrmions investigated by stroboscopic small-angle neutron scattering

    Taro Nakajima1,*, Yasuhiro Inamura2, Takayoshi Ito3, Kazuki Ohishi3, Hiroshi Oike1,4, Fumitaka Kagawa1,4, Akiko Kikkawa1, Yasujiro Taguchi1, Kazuhisa Kakurai1,3 et al.

    Yoshinori Tokura1,4 and Taka-hisa Arima1,5

    • 1RIKEN Center for Emergent Matter Science (CEMS), Saitama 351-0198, Japan
    • 2J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
    • 3Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan
    • 4Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
    • 5Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan

    • *taro.nakajima@riken.jp
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    Phys. Rev. B 98, 014424 – Published 23 July, 2018

    DOI: https://doi.org/10.1103/PhysRevB.98.014424

    Abstract

    We investigated the phase-transition kinetics of magnetic skyrmion lattice (SkL) in MnSi by means of stroboscopic small-angle neutron scattering (SANS). Temporal evolutions of SANS patterns were measured with time resolution of 13 ms while sweeping temperature as fast as 50Ks−1. It turned out that the paramagnetic-to-SkL transition immediately occurs upon traversing the equilibrium phase boundary on the rapid cooling, whereas the SkL-to-conical transition can be kinetically avoided to realize the low-temperature metastable SkL with a long-range magnetic order. The formation of the metastable SkL was found to be strongly dependent not only on cooling rate, but also on magnetic field and trajectory in the H−T phase diagram.

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    Phys. Rev. B 98, 014424– Published 23 July, 2018
    • Received 4 April 2018
    • Revised 1 June 2018
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