Anomalous Anisotropic Magnetoresistance of Antiferromagnetic Epitaxial Bimetallic Films: Mn2Au and Mn2Au/Fe Bilayers

Han Chun Wu; Mohamed Abid; Alan Kalitsov; Pavel Zarzhitsky; Mourad Abid; Zhi Min Liao; Cormac Coileáin; Hongjun Xu; Jing Jing Wang; Huajun Liu; Oleg N. Mryasov; Ching Ray Chang; Igor V. Shvets

doi:10.1002/adfm.201601348

Anomalous Anisotropic Magnetoresistance of Antiferromagnetic Epitaxial Bimetallic Films: Mn₂Au and Mn₂Au/Fe Bilayers

Han Chun Wu^*, Mohamed Abid, Alan Kalitsov, Pavel Zarzhitsky, Mourad Abid, Zhi Min Liao, Cormac Coileáin, Hongjun Xu, Jing Jing Wang, Huajun Liu, Oleg N. Mryasov, Ching Ray Chang, Igor V. Shvets

^*Corresponding author for this work

School of Physics

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

Recently intensive efforts have been devoted to the emerging field of antiferromagnetic (AFM) spintronics, where ferromagnetic electrodes are substituted by antiferromagnets. This study investigates the anisotropic magnetoresistance (AMR) of epitaxial tetragonal antiferromagnetic bimetallic films: Mn₂Au and Mn₂Au/Fe bilayers. An anomalous AMR effect with additional peaks is observed. This study theoretically and experimentally demonstrates that the AFM spins of Mn₂Au can be viewed and controlled at room temperature, and this is achievable with a notably relatively small magnetic field of 200 mT. Strong hybridization between Au and Mn, and strong modification of the intrinsic quadratic anisotropy of Mn₂Au from interfacial biquadratic anisotropy result in an additional anomalous AMR component of 1%. The findings suggest that Mn₂Au films can be used in room temperature antiferromagnetic spintronics.

Original language	English
Pages (from-to)	5884-5892
Number of pages	9
Journal	Advanced Functional Materials
Volume	26
Issue number	32
DOIs	https://doi.org/10.1002/adfm.201601348
Publication status	Published - 23 Aug 2016

Keywords

MBE
anisotropic magnetoresistance
antiferromagnetic spintronics
bimetallic antiferromagnet
spin–orbit coupling

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10.1002/adfm.201601348

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Wu, H. C., Abid, M., Kalitsov, A., Zarzhitsky, P., Abid, M., Liao, Z. M., Coileáin, C., Xu, H., Wang, J. J., Liu, H., Mryasov, O. N., Chang, C. R., & Shvets, I. V. (2016). Anomalous Anisotropic Magnetoresistance of Antiferromagnetic Epitaxial Bimetallic Films: Mn₂Au and Mn₂Au/Fe Bilayers. Advanced Functional Materials, 26(32), 5884-5892. https://doi.org/10.1002/adfm.201601348

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AU - Coileáin, Cormac

AU - Xu, Hongjun

AU - Wang, Jing Jing

AU - Liu, Huajun

AU - Mryasov, Oleg N.

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Anomalous Anisotropic Magnetoresistance of Antiferromagnetic Epitaxial Bimetallic Films: Mn₂Au and Mn₂Au/Fe Bilayers

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