Magnetoresistance effects in Pt/EuO1−x

We report on the angular and field dependence of the magnetoresistance (MR) in bilayers of Pt/EuO1−x thin films, measured in both in-plane and out-of-plane geometries at different temperatures (T). The presence of oxygen vacancies manifested by a metal–insulator transition as well as a high-T ferrom...

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Bibliographic Details
Published in:Applied physics letters 2020-05, Vol.116 (20)
Main Authors: Mallick, Kingshuk, Wagh, Aditya A., Ionescu, Adrian, Barnes, Crispin H. W., Anil Kumar, P. S.
Format: Article
Language:English
Subjects:
Applied physics
Bilayers
Crossovers
Ferromagnetism
Hall effect
Magnetism
Magnetoresistance
Magnetoresistivity
Metal-insulator transition
Thin films
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Summary:We report on the angular and field dependence of the magnetoresistance (MR) in bilayers of Pt/EuO1−x thin films, measured in both in-plane and out-of-plane geometries at different temperatures (T). The presence of oxygen vacancies manifested by a metal–insulator transition as well as a high-T ferromagnet-to-paramagnet transition (TP) was observed in the bilayers. The anisotropic magnetoresistance could be extracted in the entire T-range, even above TP, exhibiting two sign crossovers. We attribute its T-evolution to the rotation of the easy axis of the magnetization direction from a high-T out-of-plane to a low-T in-plane orientation. In addition, we provide direct experimental evidence of the spin Hall effect-induced spin Hall magnetoresistance, systematically considering several known MR contributions that can arise from the films' (111) texture and interface.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0004049