Emergence of a spin Hall topological Hall effect in the non-collinear phase of the ferrimagnetic insulator terbium-iron garnet

Abstract

Magnetic compensation in rare-earth iron garnets (REIGs) offers a unique setting for which competing sublattice moments can give rise to non-collinear (canted) magnetic configurations, in which the sublattice magnetizations are not aligned with each other or with the external magnetic field. We show that this compensation regime can also host non-trivial magnetic textures. To explore this behavior, we investigated (111)-oriented epitaxial Tb${}_3$Fe${}_5$O${}_{12}$/Pt heterostructures across the compensation temperature region using combined transverse magneto-transport and polar Kerr microscopy. Notably, we observe a topological Hall-like signal in the vicinity of the compensation temperature, a feature often interpreted as evidence for skyrmions in the absence of direct imaging. Here, in contrast, complementary Kerr microscopy reveals instead a non-collinear multidomain state which collapses outside the compensation regime, correlating directly with the appearance and disappearance of the spin Hall topological Hall effect (SH-THE) signal. These observations cannot be accounted for by a simple multi-anomalous-Hall-effect model, ruling out common artifacts as the origin, but indicate the presence of a topologically non-trivial contribution to the Hall response. These results establish strained REIG films as a tunable platform for exploring topological responses arising from compensation-driven non-collinear ferrimagnetic phases.

arXiv comment15 pages, 6 figures

References in corpus (18)

• Spin Hall Magnetoresistance Induced by a Non-Equilibrium Proximity Effect
• Theory of spin Hall magnetoresistance
• Quantitative study of the spin Hall magnetoresistance in ferromagnetic insulator/normal metal hybrids
• Spin-Hall Magnetoresistance in Platinum on Yttrium Iron Garnet: Dependence on platinum thickness and in-plane/out-of-plane magnetization
• Real-space observation of short-period cubic lattice of skyrmions in MnGe
• Giant topological Hall effect in correlated oxide thin films
• Topological Hall effect at above room temperature in heterostructures composed of a magnetic insulator and a heavy metal
• An alternative to the topological interpretation of the transverse resistivity anomalies in SrRuO3
• Interfacial Dzyaloshinskii-Moriya interaction and chiral magnetic textures in a ferrimagnetic insulator
• Spin Hall Magnetoresistance in a Canted Ferrimagnet
• Anomalous Hall effect in YIG$|$Pt bilayers
• Current-driven dynamics and ratchet effect of skyrmion bubbles in a ferrimagnetic insulator
• Exploring interfacial exchange coupling and sublattice effect in heavy metal/ferrimagnetic insulator heterostructures using Hall measurements, x-ray magnetic circular dichroism, and neutron reflectometry
• Distinguishing two-component anomalous Hall effect from topological Hall effect
• Topological Hall Effect in a Topological Insulator Interfaced with a Magnetic Insulator
• Topological Hall effect arising from the mesoscopic and microscopic non-coplanar magnetic structure in MnBi
• Planar Topological Hall Effect from Conical Spin Spirals
• Higher-order Hall response arises from octupole order and scalar spin chirality in a noncollinear antiferromagnet