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Unraveling the sign reversal of the anomalous Hall effect in ferromagnet/heavy-metal ultrathin films

journal contribution
posted on 2023-05-23, 21:14 authored by Yao ZhangYao Zhang, D Cortie, T Lagrange, W Lee, T Butler, Bartholomew LudbrookBartholomew Ludbrook, Simon GranvilleSimon Granville
The sign reversal in the anomalous Hall effect (AHE) that occurs for material offers great prospects for AHE-based spintronic devices design. However, the mechanisms are still controversial in ultrathin ferromagnetic/heavy metal thin film systems due to the complicatedly interfacial effects. Here, we investigate the AHE sign reversal in ultrathin ferromagnetic Mn2CoAl/Pd films, a system which has shown unusual AHE, significant spin-orbit coupling, and magnetic texturing. Element-sensitive cross-sectional STEM imaging and the depth-resolved magnetization profile from polarized neutron reflectometry identifies the presence of a second ferromagnetic layer from intermixed Co-Pd. To quantitatively explain the sign reversal of the AHE, we build a model based on two contributions, ferromagnetic Mn2CoAl and the intermixed CoPd layer. We also clarify that contributions to the AHE from magnetic proximity and spin Hall effect are negligible. Our work demonstrates that interfacial alloying can be a critical factor and provides insightful methods to determine the origins of the AHE in ferromagnet/heavy-metal thin film systems.

History

Preferred citation

Zhang, Y., Cortie, D., Lagrange, T., Lee, W., Butler, T., Ludbrook, B. & Granville, S. (2023). Unraveling the sign reversal of the anomalous Hall effect in ferromagnet/heavy-metal ultrathin films. Physical Review B, 107(9), 094408-. https://doi.org/10.1103/PhysRevB.107.094408

Journal title

Physical Review B

Volume

107

Issue

9

Publication date

2023-03-01

Pagination

094408

Publisher

American Physical Society (APS)

Publication status

Published

Online publication date

2023-03-10

ISSN

2469-9950

eISSN

2469-9969

Article number

094408

Language

en

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