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journal article·2019-07-01Open access

Surface-size and shape dependencies of change in chiral soliton number in submillimeter-scale crystals of chiral magnet CrNb3S6

M. Ohkuma, M. Mito, N. Nakamura, K. Tsuruta, J. Ohe, M. Shinozaki, Y. Kato, J. Kishine, Y. Kousaka, J. Akimitsu, K. Inoue

AIP Advances· Volume 9· Issue 7
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Source abstract

Abstract

We examine the surface size- and shape-effects of soliton annihilation and soliton nucleation in chiral magnet CrNb3S6. We measure magnetization (M) curves of submillimeter-sized single crystals with an equal length along the c-axis (Lc = 10 μm) but with different cross sections in the ab-plane (Sab = 0.120–0.014 mm2). We find a ferromagnetic type of magnetizing (FMM) with a convex curve (d2M/dH2 < 0) near zero field (H = 0) and a major jump in M near the forced ferromagnetic state, which are more conspicuous, compared with earlier samples with submillimeter Lc [K. Tsuruta et al. J. Phys. Soc. Jpn. 85, 013707 (2016)]. A new finding is that the major jump in M occurs at lower fields in samples with the smaller Sab. We further perform numerical simulation of the magnetization process with the Landau–Lifshitz–Gilbert equation of the Langevin-type. Based on the numerical results, we attribute the FMM at small fields to rapid annihilation of soliton assisted by the reduction of Dzyaloshinskii-Moriya interaction near the surfaces. We also discuss possible penetration processes of chiral soliton through the ac-(bc-)plane as well as ab-plane, and its relation to the major jump in M. Our experimental and calculated results will contribute to understanding of the effects of topological metastability in chiral magnets.
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Research context

OpenAlex topics: Magnetic properties of thin films · Magnetic Properties and Applications · Geomagnetism and Paleomagnetism Studies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Graduate School of Engineering, Kyushu Institute of Technology 1 , Kitakyushu 804-8550, Japan

Chirality Research Center, Hiroshima University 2 , Higashihiroshima 739-8526, Japan

Japan Synchrotron Radiation Research Institute (JASRI) 3 , Hyogo 679-5198 Japan

Department of Physics, Toho University 4 , Chiba 274-8510, Japan

Department of Basic Science, The University of Tokyo 5 , Tokyo 153-8902 Japan

Department of Physics, The University of Tokyo 6 , Tokyo 113-0033 Japan

Graduate School of Arts and Sciences, The Open University of Japan 7 , Chiba 261-8586, Japan

Institute for Molecular Science 8 , 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan

Graduate School of Engineering, Osaka Prefecture University 9 , Sakai 599-8531, Japan

Research Institute for Interdisciplinary Science, Okayama University 10 , Okayama 700-8530, Japan

Graduate School of Science, Hiroshima University 11 , Higashihiroshima 739-8526, Japan

Institute for Advanced Materials Research, Hiroshima University 12 , Higashihiroshima 739-8526, Japan

Funding

Grants-in-Aid for Scientific Research, MEXT

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