High Figure of Merit Magneto Optics from Interfacial Skyrmions on Topological Insulators

Abstract

In the Kerr rotation geometry, magneto optic memory devices typically suffer from low figure-of-merit (FOM) and long write times. We show that skyrmions formed at the interface of a thin-film multiferroic and a topological insulator can give rise to high FOM magneto optic Kerr effects (MOKEs). Huge differential MOKE can arise in parts of the phase diagram. Resonance like features in the MOKE spectra arising from the induced low energy TI bandgap, the multiferroic-film thickness, and the high energy Drude like behavior are resolved and explained. The Fermi level dependence of the MOKE signatures is distinct for the different magnetic textures. This has broad implications for magnetic texture characterization, electro-optic modulators and isolators and high density magnetic optic memory.

References in corpus (27)

• Skyrmion Lattice in a Chiral Magnet
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Spontaneous Skyrmion Ground States in Magnetic Metals
• Direct Observation of the Skyrmion Hall Effect
• Skyrmion Lattice in a Doped Semiconductor
• Massive Dirac fermions and spin physics in an ultrathin film of topological insulator
• Dynamics of Skyrmion Crystals in Metallic Thin Films
• Giant Magneto-optical Kerr Effect and Universal Faraday Effect in Thin-film Topological Insulators
• Current-driven dynamics and inhibition of the skyrmion Hall effect of ferrimagnetic skyrmions in GdFeCo films
• Spin-Wave Modes and Their Intense Excitation Effects in Skyrmion Crystals
• Electric field driven switching of individual magnetic skyrmions
• The skyrmion switch: turning magnetic skyrmion bubbles on and off with an electric field
• Quantized Anomalous Hall Effects in Skyrmion Crystal
• Magneto-Optical Faraday and Kerr Effects in Topological Insulator Films and in Other Layered Quantized Hall Systems
• Memory functions of magnetic skyrmions
• Electric-field control of the skyrmion lattice in Cu2OSeO3
• Current induced rotational torques in the skyrmion lattice phase of chiral magnets
• Discretized Topological Hall Effect Emerging from Skyrmions in Constricted Geometry
• Topological Charge Analysis of Ultrafast Single Skyrmion Creation
• Skyrmion morphology in ultrathin magnetic films
• Confined magneto-optical waves in graphene
• Magnetodielectric coupling of infrared phonons in single crystal Cu${}_2$OSeO${}_3$
• Room-temperature observation and current control of skyrmions in Pt/Co/Os/Pt thin films
• Writing a skyrmion on multiferroic materials
• Creation of Skyrmions by Electric Field on Chiral-Lattice Magnetic Insulators
• Charged skyrmions on the surface of a topological insulator
• Quantum Anomalous Hall effect in graphene coupled to skyrmions

Cited by in corpus (4)

• Particle-continuum-medium duality of skyrmions
• Anomalous Magneto Optic Effects from an Antiferromagnet Topological-Insulator Heterostructure
• Chiral electronic network within skyrmionic lattice on topological insulator surfaces
• Charge ordering and spontaneous topological Hall effect in bilayer skyrmion crystals