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Unidirectional magnetoresistance (UMR) has been observed in a variety ofstacks with ferromagnetic/spin Hall material bilayer structures. In this work,we reported UMR in antiferromagnetic insulator Fe2O3/Pt structure. The UMR hasa negative value, which is related to interfacial Rashba coupling and bandsplitting. Thickness-dependent measurement reveals a potential competitionbetween UMR and the unidirectional spin Hall magnetoresistance (USMR). Thiswork revealed the existence of UMR in antiferromagnetic insulators/heavy metalbilayers and broadens the way for the application of antiferromagnet-basedspintronic devices.

Observation of the unidirectional magnetoresistance in antiferromagnetic insulator Fe2O3/Pt bilayers