Sign reversal and amplitude enhancement of unidirectional magnetoresistance in CoFe2O4/Pt heterostructures due to spin canting

We report the observation of unidirectional magnetoresistance (UMR) in the ferrimagnetic insulator CoFe2O4(CFO)/Pt heterostructures, which stem from the giant interfacial Rashba–Edelstein effect. Furthermore, UMR has been found to show sign reversal and amplitude enhancement characteristics with dec...

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Bibliographic Details
Published in:Applied physics letters 2024-06, Vol.124 (26)
Main Authors: Guo, J. Q., Meng, K. K., Zhang, T. Z., Liu, J. J., Chen, J. K., Wu, Y., Xu, X. G., Jiang, Y.
Format: Article
Language:English
Subjects:
Aluminum oxide
Amplitudes
Cobalt ferrites
Ferrimagnets
Filing
Heterostructures
Low temperature
Magnetoresistance
Magnetoresistivity
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Summary:We report the observation of unidirectional magnetoresistance (UMR) in the ferrimagnetic insulator CoFe2O4(CFO)/Pt heterostructures, which stem from the giant interfacial Rashba–Edelstein effect. Furthermore, UMR has been found to show sign reversal and amplitude enhancement characteristics with decrease in temperature. We have ascribed it to the modulated distortion of Fermi contours due to pronounced spin canting at low temperatures. The presence of spin canting induced interfacial magnetic state has also been demonstrated by spin Hall magnetoresistance in CFO/Pt/Co/Al2O3 films. Our work reveals the interfacial magnetic state modulated UMR in CFO/Pt bilayers, thereby paving the way for extending its applications in ferrimagnet-based spintronic devices.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0202653