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Large Exotic Spin Torques in Antiferromagnetic Iron Rhodium



Jonathan Gibbons, Takaaki Dohi, Vivek Amin, Fei Xue, Haowen Ren, Hanu Arava, Hilal Saglam, Yuzi Liu, John Pearson, Nadya Mason, Amanda Petford-Long, Paul M. Haney, Soho Shim, Jun-wen Xu, Mark Stiles, Eric Fullerton, Andrew Kent, Shunsuke Fukami, Axel Hoffmann


Spin torque is a promising tool for driving magnetization dynamics for novel computing techniques. 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 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 geometry apparently defined by the magnetic ordering direction. We find the spin torque efficiency of iron rhodium to be over 300 % at 170 K and over 90 % at room temperature. We support our conclusions with theoretical calculations showing how the antiferromagnetic ordering in iron rhodium gives rise to such exotic torques.
Physical Review Applied


Gibbons, J. , Dohi, T. , Amin, V. , Xue, F. , Ren, H. , Arava, H. , Saglam, H. , Liu, Y. , Pearson, J. , Mason, N. , Petford-Long, A. , Haney, P. , Shim, S. , Xu, J. , Stiles, M. , Fullerton, E. , Kent, A. , Fukami, S. and Hoffmann, A. (2022), Large Exotic Spin Torques in Antiferromagnetic Iron Rhodium, Physical Review Applied, [online],, (Accessed January 29, 2023)
Created August 29, 2022, Updated November 29, 2022