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Interface-driven unusual anomalous Hall effect in MnxGa/Pt bilayers



Author(s): Meng, KK (Meng, K. K.); Zhu, LJ (Zhu, L. J.); Jin, ZH (Jin, Z. H.); Liu, EK (Liu, E. K.); Zhao, XP (Zhao, X. P.); Malik, IA (Malik, I. A.); Fu, ZG (Fu, Z. G.); Wu, Y (Wu, Y.); Miao, J (Miao, J.); Xu, XG (Xu, X.G.); Zhang, JX (Zhang, J. X.); Zhao, JH (Zhao, J. H.); Jiang, Y (Jiang, Y.)

Source: PHYSICAL REVIEW B Volume: 100 Issue: 18 Article Number: 184410 DOI: 10.1103/PhysRevB.100.184410 Published: NOV 11 2019

Abstract: The effects of spin-orbit coupling and symmetry breaking at the interface between a ferromagnet and heavy metal are particularly important for spin-based information storage and computation. Recent discoveries suggest they can create novel chiral spin structures (e.g., skyrmions), which have often been identified through the appearance of the bump/dip features of Hall signals, the so-called topological Hall effect (THE). In this work, however, we present an unusual anomalous Hall effect (UAHE) in MnxGa/Pt bilayers and demonstrate that the features extremely similar to THE can be generated without involving any chiral spin structures. Low-temperature magnetic force microscopy has been used to explore the magnetic field-dependent behavior of spin structures, and the UAHE as a function of magnetic field does not peak near the maximal density of magnetic bubbles. Our results unambiguously evidence that the UAHE in MnxGa/Pt bilayers shows no correlation with chiral spin structures but is driven by the modified interfacial properties, indicating a wealth of underlying and interesting physics.

Accession Number: WOS:000495949800006

ISSN: 2469-9950

eISSN: 2469-9969

Full Text: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.100.184410


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