Antiferromagnetic Skyrmions and Skyrmion Density Wave in Rashba Hund's Insulator

Abstract

We discover magnetic phases hosting highly-elusive and technologically important antiferromagnetic skyrmion quasiparicles in a model for Rashba-coupled Hund's insulator. The results are based on unbiased simulations of a classical superexchange model derived, in this work, from a realistic microscopic electronic Hamiltonian. We also discover a novel skyrmion density wave groundstate characterized by a ($Q,Q$) modulation in the local skyrmion density map. A unique inhomogeneous state characterized by a circular pattern in spin structure factor and filamentary real-space textures is identified as the parent of sparse antiferromagnetic skyrmions. We predict that the magnetic states reported here can be realized in thin films of multiorbital systems involving $4d$ or $5d$ transition metals.

Supplementary material included

References in corpus (7)

• Advances in the Physics of Magnetic Skyrmions and Perspective for Technology
• Strong electronic correlations from Hund's coupling
• Microscopic study of spin-orbit-induced Mott insulator in Ir oxides
• Antiferromagnetic skyrmion crystals: generation, topological Hall and topological spin Hall effect
• The emergence of magnetic skyrmions
• Possible emergence of a skyrmion phase in ferroelectric GaMo${}_4$S${}_8$
• New Microscopic Magnetic Hamiltonian for Exotic Spin Textures in Metals

Cited by in corpus (8)

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• Phase diagram of the square lattice Hubbard model with Rashba-type antisymmetric spin-orbit coupling
• Engineering antiferromagnetic skyrmions and antiskyrmions at metallic interfaces
• Skyrmion crystal under $D_{3h}$ point group: Role of out-of-plane Dzyaloshinskii-Moriya interaction
• Antiferro skyrmion crystal phases in a synthetic bilayer antiferromagnet under an in-plane magnetic field
• Spin-orbit coupled Hubbard skyrmions