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, Jun Akimitsu, K. Inoue

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.

Original languageEnglish
Article number075212
JournalAIP Advances
Volume9
Issue number7
DOIs
Publication statusPublished - Jul 1 2019

Fingerprint

magnets
solitary waves
crystals
magnetization
curves
metastable state
penetration
nucleation
single crystals
cross sections
simulation
interactions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Ohkuma, M., Mito, M., Nakamura, N., Tsuruta, K., Ohe, J., Shinozaki, M., ... Inoue, K. (2019). Surface-size and shape dependencies of change in chiral soliton number in submillimeter-scale crystals of chiral magnet CrNb3S6. AIP Advances, 9(7), [075212]. https://doi.org/10.1063/1.5092366

Surface-size and shape dependencies of change in chiral soliton number in submillimeter-scale crystals of chiral magnet CrNb3S6. / Ohkuma, M.; Mito, M.; Nakamura, N.; Tsuruta, K.; Ohe, J.; Shinozaki, M.; Kato, Y.; Kishine, J.; Kousaka, Y.; Akimitsu, Jun; Inoue, K.

In: AIP Advances, Vol. 9, No. 7, 075212, 01.07.2019.

Research output: Contribution to journalArticle

Ohkuma, M, Mito, M, Nakamura, N, Tsuruta, K, Ohe, J, Shinozaki, M, Kato, Y, Kishine, J, Kousaka, Y, Akimitsu, J & Inoue, K 2019, 'Surface-size and shape dependencies of change in chiral soliton number in submillimeter-scale crystals of chiral magnet CrNb3S6', AIP Advances, vol. 9, no. 7, 075212. https://doi.org/10.1063/1.5092366
Ohkuma, M. ; Mito, M. ; Nakamura, N. ; Tsuruta, K. ; Ohe, J. ; Shinozaki, M. ; Kato, Y. ; Kishine, J. ; Kousaka, Y. ; Akimitsu, Jun ; Inoue, K. / Surface-size and shape dependencies of change in chiral soliton number in submillimeter-scale crystals of chiral magnet CrNb3S6. In: AIP Advances. 2019 ; Vol. 9, No. 7.
@article{b6eced6b05ac47b6a86fd262559fabea,
title = "Surface-size and shape dependencies of change in chiral soliton number in submillimeter-scale crystals of chiral magnet CrNb3S6",
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.",
author = "M. Ohkuma and M. Mito and N. Nakamura and K. Tsuruta and J. Ohe and M. Shinozaki and Y. Kato and J. Kishine and Y. Kousaka and Jun Akimitsu and K. Inoue",
year = "2019",
month = "7",
day = "1",
doi = "10.1063/1.5092366",
language = "English",
volume = "9",
journal = "AIP Advances",
issn = "2158-3226",
publisher = "American Institute of Physics Publising LLC",
number = "7",

}

TY - JOUR

T1 - Surface-size and shape dependencies of change in chiral soliton number in submillimeter-scale crystals of chiral magnet CrNb3S6

AU - Ohkuma, M.

AU - Mito, M.

AU - Nakamura, N.

AU - Tsuruta, K.

AU - Ohe, J.

AU - Shinozaki, M.

AU - Kato, Y.

AU - Kishine, J.

AU - Kousaka, Y.

AU - Akimitsu, Jun

AU - Inoue, K.

PY - 2019/7/1

Y1 - 2019/7/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85069528423&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85069528423&partnerID=8YFLogxK

U2 - 10.1063/1.5092366

DO - 10.1063/1.5092366

M3 - Article

AN - SCOPUS:85069528423

VL - 9

JO - AIP Advances

JF - AIP Advances

SN - 2158-3226

IS - 7

M1 - 075212

ER -