@article{c8de9d7fb0624b848419e2d320121760,
title = "Unidirectional Magnetoresistance in Antiferromagnet/Heavy-Metal Bilayers",
abstract = "The interplay between electronic transport and antiferromagnetic order has attracted a surge of interest as recent studies show that a moderate change in the spin orientation of a collinear antiferromagnet may have a significant effect on the electronic band structure. Among numerous electrical probes to read out such a magnetic order, unidirectional magnetoresistance (UMR), where the resistance changes under the reversal of the current direction, can provide rich insights into the transport properties of spin-orbit-coupled systems. However, UMR has never been observed in antiferromagnets before, given the absence of intrinsic spin-dependent scattering. Here, we report a UMR in the antiferromagnetic phase of a FeRh/Pt bilayer, which undergoes a sign change and then increases strongly with an increasing external magnetic field, in contrast to UMRs in ferromagnetic and nonmagnetic systems. We show that Rashba spin-orbit coupling alone cannot explain the sizable UMR in the antiferromagnetic bilayer and that field-induced spin canting distorts the Fermi contours to greatly enhance the UMR by 2 orders of magnitude. Our results can motivate the growing field of antiferromagnetic spintronics and suggest a route to the development of tunable antiferromagnet-based spintronics devices.",
author = "Soho Shim and M. Mehraeen and Joseph Sklenar and Junseok Oh and Jonathan Gibbons and Hilal Saglam and Axel Hoffmann and Zhang, {Steven S.L.} and Nadya Mason",
note = "We thank David G. Cahill and Matthew J. Gilbert for valuable discussions. This research is primarily supported by the NSF through the University of Illinois at Urbana-Champaign Materials Research Science and Engineering Center Grant No. DMR-1720633 and is carried out in part in the Materials Research Laboratory Central Research Facilities, University of Illinois. Thin-film growth was supported as part of Quantum Materials for Energy Efficient Neuromorphic Computing (Q-MEEN-C), an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under Award No. DE-SC0019273. J.O. acknowledges support from the U.S. Army under Grant No. W911NF-20-1-0024. Work by M.M. and S.S.-L.Z. is supported by the College of Arts and Sciences, Case Western Reserve University. We thank David G. Cahill and Matthew J. Gilbert for valuable discussions. This research is primarily supported by the NSF through the University of Illinois at Urbana-Champaign Materials Research Science and Engineering Center Grant No. DMR-1720633 and is carried out in part in the Materials Research Laboratory Central Research Facilities, University of Illinois. Thin-film growth was supported as part of Quantum Materials for Energy Efficient Neuromorphic Computing (Q-MEEN-C), an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under Award No. DE-SC0019273. J.\u2009O. acknowledges support from the U.S. Army under Grant No. W911NF-20-1-0024. Work by M.\u2009M. and S.\u2009S.-L.\u2009Z. is supported by the College of Arts and Sciences, Case Western Reserve University.",
year = "2022",
month = jun,
doi = "10.1103/PhysRevX.12.021069",
language = "English (US)",
volume = "12",
journal = "Physical Review X",
issn = "2160-3308",
publisher = "American Physical Society",
number = "2",
}