Controlled transformation of skyrmions and antiskyrmions in a non-centrosymmetric magnet

Peng, Licong; Takagi, Ryuzo; Koshibae, Wataru; Shibata, Kiyou; Nakajima, Kiyomi; Arima, Taka‐hisa; Nagaosa, Naoto; Seki, Shu; Yu, Xiaojiang; Tokura, Y.

doi:10.1038/s41565-019-0616-6

Cited by 158 publications

(176 citation statements)

References 29 publications

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“…For example, Bloch-type skyrmions can be stabilized in chiral magnets with the Dresselhaus spin-orbit interaction, while Néel-type skyrmions may appear in polar magnets with the Rashba spin-orbit interaction or in magnetic ultrathin films with interfacial DMI [30][31][32][33]. Meanwhile, the magnetic antiskyrmions discovered in Heusler compounds are stabilized by the anisotropic DMI with opposite signs along two orthogonal in-plane directions [34][35][36][37][38]. Although different skyrmions may be observed in different materials, their morphology in one compound is always fixed because the DMI is determined by the structure.…”

Section: Introductionmentioning

confidence: 99%

Controlling the helicity of magnetic skyrmions by electrical field in frustrated magnets

Yao

Dong

2020

New J. Phys.

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The skyrmions generated by frustration in centrosymmetric structures host extra internal degrees of freedom-vorticity and helicity, resulting in distinctive properties and potential functionality, which are not shared by the skyrmions stemming from the Dzyaloshinskii-Moriya interaction in noncentrosymmetric structures. The present work indicates that the magnetism-driven electric polarization carried by skyrmions provides a direct handle for tuning helicity. Especially for the in-plane magnetized skyrmions, the helicity can be continuously rotated and exactly picked by applying an external electric field for both skyrmions and antiskyrmions. The in-plane uniaxial anisotropy is beneficial to this manipulation.

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Section: Introductionmentioning

confidence: 99%

Controlling the helicity of magnetic skyrmions by electrical field in frustrated magnets

Yao

Dong

2020

New J. Phys.

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“…For example, since the ME multipoles are intrinsically antiferromagnetic entities, they play a key role for emergent ME coupling phenomena in antiferromagnets 7,9,10 . Also, they are carried by a spin texture such as (anti)skyrmions 11 , thus having a close relationship to functional properties of such topological magnetic phases. Moreover they are discussed in relation to unconventional superconductivity, e.g., in high-T c cuprates 12,13 .…”

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confidence: 99%

Imaging switchable magnetoelectric quadrupole domains via nonreciprocal linear dichroism

et al. 2020

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Parity-odd magnetoelectric multipoles such as magnetic quadrupoles and toroidal dipoles contribute to various symmetry-dependent magnetic phenomena and formation of exotic ordered phases. However, the observation of domain structures emerging due to symmetry breaking caused by these multipoles is a severe challenge because of their antiferromagnetic nature without net magnetization. Here, we report the discovery of nonreciprocal linear dichroism for visible light (~4% at 1.8 eV) in a magnetic quadrupole ordered phase of antiferromagnetic Pb(TiO)Cu 4 (PO 4) 4 , which enables the identification of magnetic quadrupole domains of opposite signs. Symmetry considerations indicate that nonreciprocal linear dichroism is induced by the optical magnetoelectric effect, i.e., the linear magnetoelectric effect for electromagnetic waves. Using the nonreciprocal linear dichroism, we successfully visualize spatial distributions of quadrupole domains and their isothermal electric-field switching by means of a transmission-type polarized light microscope. The present work exemplifies that the optical magnetoelectric effect efficiently visualizes magnetoelectric multipole domains responding to external perturbations.

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“…[17] Recently, antiskyrmions and their lattice state were observed in the Heusler magnet with D 2d symmetry, Mn 1.4 Pt 0.9 Pd 0.1 Sn. [18,19] In this Heusler magnet, the antiskyrmions are square shaped due to the interplay of anisotropic Dzyaloshinskii-Moriya interactions (DMI) and dipole interactions, [20,21] with Bloch lines positioned at each corner. The Bloch lines are oriented along the two diagonal axes crossing through the square geometry.…”

Section: Doi: 101002/adma202004206mentioning

confidence: 99%

“…is due to D 2d symmetry in the Heusler magnet crystal structure and only exists in the x-y plane, [5,19] leading to the formation of antiskyrmions. The square shape of the antiskyrmions seen in this material system is due to interplay between this anisotropic DMI and the magnetic dipole interaction, as seen in previous Lorentz transmission electron microscopy (LTEM) studies.…”

Section: Much Scientific Capital Has Been Directed Toward Exotic Magnmentioning

confidence: 99%

“…The square shape of the antiskyrmions seen in this material system is due to interplay between this anisotropic DMI and the magnetic dipole interaction, as seen in previous Lorentz transmission electron microscopy (LTEM) studies. [19,23,24] In particular, square-shaped antiskyrmions form a square lattice as the dipole interaction energy contribution increases.…”

Section: Much Scientific Capital Has Been Directed Toward Exotic Magnmentioning

confidence: 99%

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Bloch Lines Constituting Antiskyrmions Captured via Differential Phase Contrast

et al. 2020

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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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Controlled transformation of skyrmions and antiskyrmions in a non-centrosymmetric magnet

Cited by 158 publications

References 29 publications

Controlling the helicity of magnetic skyrmions by electrical field in frustrated magnets

Controlling the helicity of magnetic skyrmions by electrical field in frustrated magnets

Imaging switchable magnetoelectric quadrupole domains via nonreciprocal linear dichroism

Bloch Lines Constituting Antiskyrmions Captured via Differential Phase Contrast

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