Geometrical protection of topological magnetic solitons in microprocessed chiral magnets

Masaki Mito; Hiroyuki Ohsumi; Kazuki Tsuruta; Yoshinori Kotani; Tetsuya Nakamura; Yoshihiko Togawa; Misako Shinozaki; Yusuke Kato; Jun Ichiro Kishine; Jun Ichiro Ohe; Yusuke Kousaka; Jun Akimitsu; Katsuya Inoue

doi:10.1103/PhysRevB.97.024408

Geometrical protection of topological magnetic solitons in microprocessed chiral magnets

Masaki Mito, Hiroyuki Ohsumi, Kazuki Tsuruta, Yoshinori Kotani, Tetsuya Nakamura, Yoshihiko Togawa, Misako Shinozaki, Yusuke Kato, Jun Ichiro Kishine, Jun Ichiro Ohe, Yusuke Kousaka, Jun Akimitsu, Katsuya Inoue

Research Institute for Interdisciplinary Science

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

A chiral soliton lattice stabilized in a monoaxial chiral magnet CrNb3S6 is a magnetic superlattice consisting of magnetic kinks with a ferromagnetic background. The magnetic kinks are considered to be topological magnetic solitons (TMSs). Changes in the TMS number yield discretized responses in magnetization and electrical conductivity, and this effect is more prominent in smaller crystals. We demonstrate that, in microprocessed CrNb3S6 crystals, TMSs are geometrically protected through element-selected micromagnetometry using soft x-ray magnetic circular dichroism (MCD). A series of x-ray MCD data is supported by mean-field and micromagnetic analyses. By designing the microcrystal geometry, TMS numbers can be successfully changed and fixed over a wide range of magnetic fields.

Original language	English
Article number	024408
Journal	Physical Review B
Volume	97
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.97.024408
Publication status	Published - Jan 9 2018

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Geometrical protection of topological magnetic solitons in microprocessed chiral magnets. / Mito, Masaki; Ohsumi, Hiroyuki; Tsuruta, Kazuki; Kotani, Yoshinori; Nakamura, Tetsuya; Togawa, Yoshihiko; Shinozaki, Misako; Kato, Yusuke; Kishine, Jun Ichiro; Ohe, Jun Ichiro; Kousaka, Yusuke; Akimitsu, Jun; Inoue, Katsuya.

In: Physical Review B, Vol. 97, No. 2, 024408, 09.01.2018.

Research output: Contribution to journal › Article › peer-review

Mito, Masaki ; Ohsumi, Hiroyuki ; Tsuruta, Kazuki ; Kotani, Yoshinori ; Nakamura, Tetsuya ; Togawa, Yoshihiko ; Shinozaki, Misako ; Kato, Yusuke ; Kishine, Jun Ichiro ; Ohe, Jun Ichiro ; Kousaka, Yusuke ; Akimitsu, Jun ; Inoue, Katsuya. / Geometrical protection of topological magnetic solitons in microprocessed chiral magnets. In: Physical Review B. 2018 ; Vol. 97, No. 2.

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title = "Geometrical protection of topological magnetic solitons in microprocessed chiral magnets",

abstract = "A chiral soliton lattice stabilized in a monoaxial chiral magnet CrNb3S6 is a magnetic superlattice consisting of magnetic kinks with a ferromagnetic background. The magnetic kinks are considered to be topological magnetic solitons (TMSs). Changes in the TMS number yield discretized responses in magnetization and electrical conductivity, and this effect is more prominent in smaller crystals. We demonstrate that, in microprocessed CrNb3S6 crystals, TMSs are geometrically protected through element-selected micromagnetometry using soft x-ray magnetic circular dichroism (MCD). A series of x-ray MCD data is supported by mean-field and micromagnetic analyses. By designing the microcrystal geometry, TMS numbers can be successfully changed and fixed over a wide range of magnetic fields.",

author = "Masaki Mito and Hiroyuki Ohsumi and Kazuki Tsuruta and Yoshinori Kotani and Tetsuya Nakamura and Yoshihiko Togawa and Misako Shinozaki and Yusuke Kato and Kishine, {Jun Ichiro} and Ohe, {Jun Ichiro} and Yusuke Kousaka and Jun Akimitsu and Katsuya Inoue",

note = "Funding Information: We found that the geometry of the environment surrounding the microprocessed CrNb 3 S 6 crystals essentially affects the TMS formation. By designing the microcrystal shapes, we demonstrated how to preserve and change the TMS number over a wide range of magnetic fields. This effect was confirmed through the experimentally observed magnetization hysteresis and was supported by MF calculations and micromagnetic simulations. The results reported here indicate that the fabricated microcrystals of the monoaxial chiral helimagnet have the functionality of a TMS valve. ",

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AU - Mito, Masaki

AU - Ohsumi, Hiroyuki

AU - Tsuruta, Kazuki

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AU - Nakamura, Tetsuya

AU - Togawa, Yoshihiko

AU - Shinozaki, Misako

AU - Kato, Yusuke

AU - Kishine, Jun Ichiro

AU - Ohe, Jun Ichiro

AU - Kousaka, Yusuke

AU - Akimitsu, Jun

AU - Inoue, Katsuya

N1 - Funding Information: We found that the geometry of the environment surrounding the microprocessed CrNb 3 S 6 crystals essentially affects the TMS formation. By designing the microcrystal shapes, we demonstrated how to preserve and change the TMS number over a wide range of magnetic fields. This effect was confirmed through the experimentally observed magnetization hysteresis and was supported by MF calculations and micromagnetic simulations. The results reported here indicate that the fabricated microcrystals of the monoaxial chiral helimagnet have the functionality of a TMS valve.

PY - 2018/1/9

Y1 - 2018/1/9

N2 - A chiral soliton lattice stabilized in a monoaxial chiral magnet CrNb3S6 is a magnetic superlattice consisting of magnetic kinks with a ferromagnetic background. The magnetic kinks are considered to be topological magnetic solitons (TMSs). Changes in the TMS number yield discretized responses in magnetization and electrical conductivity, and this effect is more prominent in smaller crystals. We demonstrate that, in microprocessed CrNb3S6 crystals, TMSs are geometrically protected through element-selected micromagnetometry using soft x-ray magnetic circular dichroism (MCD). A series of x-ray MCD data is supported by mean-field and micromagnetic analyses. By designing the microcrystal geometry, TMS numbers can be successfully changed and fixed over a wide range of magnetic fields.

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