Fluctuation-induced Néel and Bloch skyrmions at topological insulator surfaces
arXiv:1804.07684 · doi:10.1103/PhysRevB.98.060401
Abstract
Ferromagnets in contact with a topological insulator have become appealing candidates for spintronics due to the presence of Dirac surface states with spin-momentum locking. Because of this bilayer BiSe-EuS structures, for instance, show a finite magnetization at the interface at temperatures well exceeding the Curie temperature of bulk EuS. Here we determine theoretically the effective magnetic interactions at a topological insulator-ferromagnet interface {\it above} the magnetic ordering temperature. We show that by integrating out the Dirac fermion fluctuations an effective Dzyaloshinskii-Moriya interaction and magnetic charging interaction emerge. As a result individual magnetic skyrmions and extended skyrmion lattices can form at interfaces of ferromagnets and topological insulators, the first indications of which have been very recently observed experimentally.
arXiv commentLaTex, 11 pages including supplemental information, 4 figures; v2: revised version accepted for publication in PRB RC; v3: Typos corrected, additional affiliation and grant acknowledgment included. Matches published version
References in corpus (31)
- Topological Insulators
- Topological insulators and superconductors
- Topological Field Theory of Time-Reversal Invariant Insulators
- Advances in the Physics of Magnetic Skyrmions and Perspective for Technology
- Spontaneous Skyrmion Ground States in Magnetic Metals
- Observation of room temperature magnetic skyrmions and their current-driven dynamics in ultrathin Co films
- Skyrmions at room temperature : From magnetic thin films to magnetic multilayers
- Additive interfacial chiral interaction in multilayers for stabilization of small individual skyrmion at room temperature
- Room temperature chiral magnetic skyrmion in ultrathin magnetic nanostructures
- Model Hamiltonian for Topological Insulators
- Tunable Room Temperature Magnetic Skyrmions in Ir/Fe/Co/Pt Multilayers
- Inverse Spin-Galvanic Effect in a Topological-Insulator/Ferromagnet Interface
- The properties of isolated chiral skyrmions in thin magnetic films
- Magnon-skyrmion scattering in chiral magnets
- Chiral skyrmions in cubic helimagnet films: the role of uniaxial anisotropy
- Above 400 K Robust Perpendicular Ferromagnetic Phase in a Topological Insulator
- Dynamics of magnetization on the topological surface
- Emerging Weak Localization Effects on Topological Insulator-Insulating Ferromagnet (Bi_2Se_3-EuS) Interface
- Thin-Film Magnetization Dynamics on the Surface of a Topological Insulator
- Direct measurement of proximity-induced magnetism at the interface between a topological insulator and a ferromagnet
- Magnon modes and magnon-vortex scattering in two-dimensional easy-plane ferromagnets
- Spin eigen-excitations of the magnetic skyrmion and problem of the effective mass
- Magnetic Proximity Effect and Interlayer Exchange Coupling of Ferromagnetic/Topological Insulator/Ferromagnetic Trilayer
- Internal Modes and Magnon Scattering on Topological Solitons in 2d Easy-Axis Ferromagnets
- Spin and Orbital Magnetic Response on the Surface of a Topological Insulator
- Amplitudes for magnon scattering by vortices in two-dimensional weakly easy-plane ferromagnets
- Fluctuation-induced magnetization dynamics and criticality at the interface of a topological insulator with a magnetically ordered layer
- Dynamics of topological solitons in two-dimensional ferromagnets
- Semi-metal-insulator transition on the surface of a topological insulator with in-plane magnetization
- Non-local topological magnetoelectric effect by Coulomb interaction at a topological insulator-ferromagnet interface
- Topological magnetic dipolar interaction and non-local electric magnetization control in topological insulator heterostructures
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- Finite temperature fluctuation-induced order and responses in magnetic topological insulators
- Exact solutions for a ferromagnet with Dzyaloshinskii-Moriya interaction
- Interface-Induced Stability of Nontrivial Topological Spin Textures: Unveiling Room-Temperature Hopfions and Skyrmions
- Exchange tensors, generalized RKKY interactions, and magnetization dynamics in heterostructures of ferromagnets and topological insulators