@article{d77550da09f14f48914ebd1c377406ab,
title = "Large Exotic Spin Torques in Antiferromagnetic Iron Rhodium",
abstract = "Spin torque is a promising tool for driving magnetization dynamics for computing technologies. These torques can be easily produced by spin-orbit effects, but for most conventional spin source materials, a high degree of crystal symmetry limits the geometry of the spin torques produced. Magnetic ordering is one way to reduce the symmetry of a material and allow exotic torques, and antiferromagnets are particularly promising because they are robust against external fields. We present spin torque ferromagnetic resonance (ST-FMR) measurements and second harmonic Hall measurements characterizing the spin torques in antiferromagnetic iron rhodium alloy. We report extremely large, strongly temperature-dependent exotic spin torques with a geometry apparently defined by the magnetic ordering direction. We find the spin torque efficiency of iron rhodium to be (207 ± 94)% at 170 K and (88 ± 32)% at room temperature. We support our conclusions with theoretical calculations showing how the antiferromagnetic ordering in iron rhodium gives rise to such exotic torques.",
author = "Jonathan Gibbons and Takaaki Dohi and Amin, {Vivek P.} and Fei Xue and Haowen Ren and Xu, {Jun Wen} and Hanu Arava and Soho Shim and Hilal Saglam and Yuzi Liu and Pearson, {John E.} and Nadya Mason and Petford-Long, {Amanda K.} and Haney, {Paul M.} and Stiles, {Mark D.} and Fullerton, {Eric E.} and Kent, {Andrew D.} and Shunsuke Fukami and Axel Hoffmann",
note = "We would like to thank I. Schuller, S. Siddiqui, M. Lonsky, M. Vogel, and Y. Li for useful discussions relevant to this research. All parts of this work were partially or fully supported as part of Quantum Materials for Energy Efficient Neuromorphic Computing (Q-MEEN-C), an Energy Frontier Research Center funded by the US Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under Award No. DE-SC0019273. The second harmonic Hall measurements were also supported by the NSF through the University of Illinois at Urbana-Champaign Materials Research Science and Engineering Center under Grant No. DMR-1720633 and were, in part, carried out in the Materials Research Laboratory Central Research Facilities, University of Illinois. Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the US DOE, Office of Science, BES, under Contract No. DE-AC02-06CH11357. F.X. acknowledges support under the Cooperative Research Agreement between the University of Maryland and the National Institute of Standards and Technology Physical Measurement Laboratory, Award No. 70NANB14H209, through the University of Maryland. The theoretical calculations in this work were partly supported by the National Institute of Standards and Technology, US Department of Commerce. A portion of this work was also supported by the JSPS Kakenhi No. 19H05622. T.D. acknowledges the financial support from the GP-Spin of Tohoku University.",
year = "2022",
month = aug,
doi = "10.1103/PhysRevApplied.18.024075",
language = "English (US)",
volume = "18",
journal = "Physical Review Applied",
issn = "2331-7019",
publisher = "American Physical Society",
number = "2",
}