Topological Hall Effect in a Topological Insulator Interfaced with a Magnetic Insulator

Abstract

A topological insulator (TI) interfaced with a magnetic insulator (MI) may host an anomalous Hall effect (AHE), a quantum AHE, and a topological Hall effect (THE). Recent studies, however, suggest that coexisting magnetic phases in TI/MI heterostructures may result in an AHE-associated response that resembles a THE but in fact is not. This article reports a genuine THE in a TI/MI structure that has only one magnetic phase. The structure shows a THE in the temperature range of T=2-3 K and an AHE at T=80-300 K. Over T=3-80 K, the two effects coexist but show opposite temperature dependencies. Control measurements, calculations, and simulations together suggest that the observed THE originates from skyrmions, rather than the coexistence of two AHE responses. The skyrmions are formed due to an interfacial DMI interaction. The DMI strength estimated is substantially higher than that in heavy metal-based systems.

References in corpus (11)

• Advances in the Physics of Magnetic Skyrmions and Perspective for Technology
• Additive interfacial chiral interaction in multilayers for stabilization of small individual skyrmion at room temperature
• Interface-driven topological Hall effect in SrRuO${}_3$-SrIrO${}_3$ bilayer
• Tailoring tricolor structure of magnetic topological insulator for robust axion insulator
• Above 400 K Robust Perpendicular Ferromagnetic Phase in a Topological Insulator
• Topological Hall effect at above room temperature in heterostructures composed of a magnetic insulator and a heavy metal
• Large Anomalous Hall Effect in Topological Insulators with Proximitized Ferromagnetic Insulators
• Investigation of the Dzyaloshinskii-Moriya interaction and room temperature skyrmions in W/CoFeB/MgO thin films and microwires
• Spin and Orbital Magnetic Response on the Surface of a Topological Insulator
• Coexistence of surface and bulk ferromagnetism mimics skyrmion Hall effect in a topological insulator
• Tailoring Magnetic Skyrmions by Geometric Confinement of Magnetic Structures

Cited by in corpus (2)

• Observation of colossal topological Hall effect in noncoplanar ferromagnet Cr5Te6 thin films
• Topological phase transitions and Berry-phase hysteresis in exchange-coupled nanomagnets