Interface-driven unusual anomalous Hall effect in M nxGa/Pt bilayers

K. K. Meng, L. J. Zhu, Z. H. Jin, E. K. Liu, X. P. Zhao, I. A. Malik, Z. G. Fu, Y. Wu, J. Miao, X. G. Xu, J. X. Zhang, J. H. Zhao, Y. Jiang

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

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.

Original languageEnglish
Article number184410
JournalPhysical Review B
Volume100
Issue number18
DOIs
Publication statusPublished - 2019 Nov 11

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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