Bloch Lines Constituting Antiskyrmions Captured via Differential Phase Contrast

Fehmi S. Yasin; Licong Peng; Rina Takagi; Naoya Kanazawa; Shinichiro Seki; Yoshinori Tokura; Xiuzhen Yu

doi:10.1002/adma.202004206

Bloch Lines Constituting Antiskyrmions Captured via Differential Phase Contrast

Fehmi S. Yasin, Licong Peng, Rina Takagi, Naoya Kanazawa, Shinichiro Seki, Yoshinori Tokura, Xiuzhen Yu

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

24 Scopus citations

Abstract

Much scientific capital has been directed toward exotic magnetic spin textures called Bloch lines, that is, Néel-type line boundaries within domain walls, because their geometry promises high-density magnetic storage. While predicted to arise in high-anisotropy magnets, bulk soft magnets, and thin films with in-plane magnetization, Bloch lines also constitute magnetic antiskyrmions, that is, topological antiparticles of skyrmions. Most domain walls occur as Bloch-type or Néel-type, in which the magnetization rotates parallel or perpendicular to the domain wall across its profile, respectively. The Bloch lines’ Néel-type rotation and their minute size make them difficult to directly measure. This work utilizes differential phase contrast (DPC) scanning transmission electron microscopy (STEM) to measure the in-plane magnetization of Bloch lines within antiskyrmions emergent in a non-centrosymmetric Heusler magnet with D_2d symmetry, Mn_1.4Pt_0.9Pd_0.1Sn, in addition to Bloch-type skyrmions in an FeGe magnet with B20-type crystal structure to benchmark the DPC technique. Both in-focus measurement and identification of Bloch lines at the antiskyrmion's corners are provided.

Original language	English
Article number	2004206
Journal	Advanced Materials
Volume	32
Issue number	46
DOIs	https://doi.org/10.1002/adma.202004206
State	Published - Nov 19 2020
Externally published	Yes

Funding

The authors thank Jan Masell for helpful discussions, Wataru Koshibae for providing the simulated individual antiskyrmion, Kiyou Shibata for providing the simulated antiskyrmion lattice, and T. Kikitsu (Materials Characterization Support Team in the RIKEN Center for Emergent Matter Science) for technical support on the TEM (JEM‐2100F), which was used to obtain DPC images. This work was funded in part by Grants‐In‐Aid for Scientific Research (A) (Grant Nos. 19H00660, 18H03685, 20H00349) from JSPS, CREST program (Grant No. JPMJCR1874), and PRESTO program from Japan Science and Technology Agency (JST) (Grant No. JPMJPR18L5), Asahi Glass Foundation, and Murata Science Foundation.

Funders	Funder number
Fogarty International Center	F15TW000349
Asahi Glass Foundation
Japan Society for the Promotion of Science
Japan Science and Technology Agency	JPMJPR18L5
Core Research for Evolutional Science and Technology	JPMJCR1874
Murata Science Foundation

Keywords

Bloch lines
Heusler compounds
antiskyrmions
differential phase contrast scanning transmission electron microscopy
spintronics

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10.1002/adma.202004206

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title = "Bloch Lines Constituting Antiskyrmions Captured via Differential Phase Contrast",

abstract = "Much scientific capital has been directed toward exotic magnetic spin textures called Bloch lines, that is, N{\'e}el-type line boundaries within domain walls, because their geometry promises high-density magnetic storage. While predicted to arise in high-anisotropy magnets, bulk soft magnets, and thin films with in-plane magnetization, Bloch lines also constitute magnetic antiskyrmions, that is, topological antiparticles of skyrmions. Most domain walls occur as Bloch-type or N{\'e}el-type, in which the magnetization rotates parallel or perpendicular to the domain wall across its profile, respectively. The Bloch lines{\textquoteright} N{\'e}el-type rotation and their minute size make them difficult to directly measure. This work utilizes differential phase contrast (DPC) scanning transmission electron microscopy (STEM) to measure the in-plane magnetization of Bloch lines within antiskyrmions emergent in a non-centrosymmetric Heusler magnet with D2d symmetry, Mn1.4Pt0.9Pd0.1Sn, in addition to Bloch-type skyrmions in an FeGe magnet with B20-type crystal structure to benchmark the DPC technique. Both in-focus measurement and identification of Bloch lines at the antiskyrmion's corners are provided.",

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author = "Yasin, {Fehmi S.} and Licong Peng and Rina Takagi and Naoya Kanazawa and Shinichiro Seki and Yoshinori Tokura and Xiuzhen Yu",

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AU - Kanazawa, Naoya

AU - Seki, Shinichiro

AU - Tokura, Yoshinori

AU - Yu, Xiuzhen

PY - 2020/11/19

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N2 - Much scientific capital has been directed toward exotic magnetic spin textures called Bloch lines, that is, Néel-type line boundaries within domain walls, because their geometry promises high-density magnetic storage. While predicted to arise in high-anisotropy magnets, bulk soft magnets, and thin films with in-plane magnetization, Bloch lines also constitute magnetic antiskyrmions, that is, topological antiparticles of skyrmions. Most domain walls occur as Bloch-type or Néel-type, in which the magnetization rotates parallel or perpendicular to the domain wall across its profile, respectively. The Bloch lines’ Néel-type rotation and their minute size make them difficult to directly measure. This work utilizes differential phase contrast (DPC) scanning transmission electron microscopy (STEM) to measure the in-plane magnetization of Bloch lines within antiskyrmions emergent in a non-centrosymmetric Heusler magnet with D2d symmetry, Mn1.4Pt0.9Pd0.1Sn, in addition to Bloch-type skyrmions in an FeGe magnet with B20-type crystal structure to benchmark the DPC technique. Both in-focus measurement and identification of Bloch lines at the antiskyrmion's corners are provided.

AB - Much scientific capital has been directed toward exotic magnetic spin textures called Bloch lines, that is, Néel-type line boundaries within domain walls, because their geometry promises high-density magnetic storage. While predicted to arise in high-anisotropy magnets, bulk soft magnets, and thin films with in-plane magnetization, Bloch lines also constitute magnetic antiskyrmions, that is, topological antiparticles of skyrmions. Most domain walls occur as Bloch-type or Néel-type, in which the magnetization rotates parallel or perpendicular to the domain wall across its profile, respectively. The Bloch lines’ Néel-type rotation and their minute size make them difficult to directly measure. This work utilizes differential phase contrast (DPC) scanning transmission electron microscopy (STEM) to measure the in-plane magnetization of Bloch lines within antiskyrmions emergent in a non-centrosymmetric Heusler magnet with D2d symmetry, Mn1.4Pt0.9Pd0.1Sn, in addition to Bloch-type skyrmions in an FeGe magnet with B20-type crystal structure to benchmark the DPC technique. Both in-focus measurement and identification of Bloch lines at the antiskyrmion's corners are provided.

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Bloch Lines Constituting Antiskyrmions Captured via Differential Phase Contrast

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