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

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 C${}_{nv}$ 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 chiral magnets with D${}_{2d}$ symmetry, depends on the in-plane orientation of the magnetic field and can be parallel, anti-parallel, 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 C${}_{3v}$ symmetry, GaV${}_4$S${}_8$ and GaV${}_4$Se${}_8$.

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Cited by in corpus (34)

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• Optically driven collective spin excitations and magnetization dynamics in the Néel-type skyrmion host GaV${}_4$S${}_8$
• Skyrmion crystals in centrosymmetric triangular magnets under hexagonal and trigonal single-ion anisotropy
• Mapping Skyrmion Stability in Uniaxial Lacunar Spinel Magnets from First-Principles
• Kelvin modes of a skyrmion line in chiral magnets and the associated magnon transport
• Stability of Néel-type skyrmion lattice against oblique magnetic fields in GaV${}_4$S${}_8$ and GaV${}_4$Se${}_8$
• Lattice dynamics and electronic excitations in a large family of lacunar spinels with a breathing pyrochlore lattice structure
• On the magnetic structures of 1:1:1 stoichiometric topological phases LnSbTe (Ln = Pr, Nd, Dy and Er)
• Stability of in-plane and out-of-plane chiral skyrmions in epitaxial MnSi(111)/Si(111) thin films: surface twists versus easy-plane anisotropy
• Magnetoentropic mapping and computational modeling of cycloids and skyrmions in the lacunar spinels GaV${}_4$S${}_8$ and GaV${}_4$Se${}_8$
• Robust cycloid crossover driven by anisotropy in the skyrmion host GaV${}_4$S${}_8$
• Angular dependence of Hall effect and magnetoresistance in SrRuO${}_3$-SrIrO${}_3$ heterostructures
• Thermal generation of droplet soliton in chiral magnet
• Magnetic Skyrmion Lattice by Fourier Transform Method
• Anomalous magnetoentropic response of skrymion crystals
• Vital role of anisotropy in cubic chiral skyrmion hosts
• Tailoring magnetic interactions in atomic bilayers of Rh and Fe on Re(0001)
• Long-wavelength emergent phonons in skyrmion crystals distorted by exchange anisotropy and tilted magnetic fields
• Skyrmions in an oblique field: A path to novel binary and quaternary memory
• Angular dependence of hump-shape Hall Effects for distinguishing between Karplus-Luttinger and Geometrical Origins
• Optical, dielectric, and magnetoelectric properties of ferroelectric and antiferroelectric lacunar spinels