Skyrmion robustness in noncentrosymmetric magnets with axial symmetry: The role of anisotropy and tilted magnetic fields

A. O. Leonov, I. Kézsmárki

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We investigate the stability of Néel skyrmions against tilted magnetic fields in polar magnets with uniaxial anisotropy ranging from easy-plane to easy-axis type. We construct the corresponding phase diagrams and investigate the internal structure of skewed skyrmions with displaced cores. We find that moderate easy-plane anisotropy increases the stability range of Néel skyrmions for fields along the symmetry axis, while moderate easy-axis anisotropy enhances their robustness against tilted magnetic fields. We stress that the direction along which the skyrmion cores are shifted depends on the symmetry of the underlying crystal lattice. The cores of Néel skyrmions, realized in polar magnets with Cnv symmetry, are displaced either along or opposite to the off-axis (in-plane) component of the magnetic field depending on the rotation sense of the magnetization, dictated by the sign of the Dzyaloshinskii constant. The core shift of antiskyrmions, present in noncentrosymmetric magnets with D2d symmetry, depends on the in-plane orientation of the magnetic field and can be parallel, antiparallel, or perpendicular to it. We argue that the role of anisotropy in magnets with axially symmetric crystal structure is different from that in cubic helimagnets. Our results can be applied to address recent experiments on polar magnets with C3v symmetry, GaV4S8 and GaV4Se8, and Mn1.4Pt0.9Pd0.1Sn with D2d symmetry.

Original languageEnglish
Article number214413
JournalPhysical Review B
Volume96
Issue number21
DOIs
Publication statusPublished - Dec 8 2017

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Magnets
Anisotropy
magnets
Magnetic fields
anisotropy
symmetry
magnetic fields
Crystal symmetry
Crystal lattices
Phase diagrams
Magnetization
crystal lattices
Crystal structure
phase diagrams
magnetization
crystal structure
shift
Experiments

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Skyrmion robustness in noncentrosymmetric magnets with axial symmetry : The role of anisotropy and tilted magnetic fields. / Leonov, A. O.; Kézsmárki, I.

In: Physical Review B, Vol. 96, No. 21, 214413, 08.12.2017.

Research output: Contribution to journalArticle

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