Observation of nonlinear planar Hall effect in magnetic insulator/topological insulator heterostructures

Abstract

Interfacing topological insulators (TIs) with magnetic insulators (MIs) has been widely used to study the interaction between topological surface states and magnetism. Previous transport studies typically interpret the suppression of weak antilocalization or appearance of the anomalous Hall effect as signatures of magnetic proximity effect (MPE) imposed to TIs. Here, we report the observation of nonlinear planar Hall effect (NPHE) in Bi2Se3 films grown on MI thulium and yttrium iron garnet (TmIG and YIG) substrates, which is an order of magnitude larger than that in Bi2Se3 grown on nonmagnetic gadolinium gallium garnet (GGG) substrate. The nonlinear Hall resistance in TmIG/Bi2Se3 depends linearly on the external magnetic field, while that in YIG/Bi2Se3 exhibits an extra hysteresis loop around zero field. The magnitude of the NPHE is found to scale inversely with carrier density. We speculate the observed NPHE is related to the MPE-induced exchange gap opening and out-of-plane spin textures in the TI surface states, which may be used as an alternative transport signature of the MPE in MI/TI heterostructures.

References in corpus (11)

• Topological Field Theory of Time-Reversal Invariant Insulators
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator
• Above 400 K Robust Perpendicular Ferromagnetic Phase in a Topological Insulator
• Nonlinear planar Hall effect
• Large Anomalous Hall Effect in Topological Insulators with Proximitized Ferromagnetic Insulators
• Nonlinear spin current generation in noncentrosymmetric spin-orbit coupled systems
• Changes of Magnetism in a Magnetic Insulator due to Proximity to a Topological Insulator
• Absence of magnetic-proximity effect at the interface of Bi${}_2$Se${}_3$ and (Bi,Sb)${}_2$Te${}_3$ with EuS
• Dirac-Electrons-Mediated Magnetic Proximity Effect in Topological Insulator / Magnetic Insulator Heterostructures
• Search for enhanced magnetism at the interface between Bi${}_2$Se${}_3$ and EuSe

Cited by in corpus (4)

• Disorder in the non-linear anomalous Hall effect of $\mathcal{P}\mathcal{T}$-symmetric Dirac fermions
• Quantum kinetic theory of quadratic responses
• Determination of spin-orbit interaction in semiconductor nanostructures via non-linear transport
• Proximity-induced nonlinear magnetoresistances on topological insulators