Magnetic order can reduce the symmetry of the underlying crystal lattice, allowing for the generation of spin torques with novel symmetries. By controlling the magnetic ordering of the material, it is therefore possible to control the orientations of the torque and generate torques that are better suited to applications such as switching perpendicularly magnetized nanomagnets and driving dynamics in spin torque oscillators for neurotrophic tasks. Antiferromagnets are better suited to this task than ferromagnets, as they can be prepared into a magnetically ordered state that is robust against external influence. However, spin torques with new symmetries have not yet been observed in collinear antiferromagnetic materials. We report large, highly temperature-dependent unconventional spin torques generated in collinear antiferromagnetic FeRh, and further show the effects of the magnetic ordering direction on spin torque geometries using FeRh. These experimental observations are supported by theoretical calculations of spin torques from FeRh.
*This work was supported as part of Quantum Materials for Energy Efficient Neuromorphic Computing, an Energy Frontier Research Center funded by the U.S. DOE, Office of Science.
–
Presenters
Jonathan Gibbons
Material Science and Engineering, University of Illinois at Urbana-Champaign
Materials Science and Engineering, University of Illinois, Urbana-Champaign, Materials Science, Argonne National Laboratory, Physics, University of California, San Diego
Materials Science and Engineering, University of Illinois at Urbana-Champaign
Authors
Jonathan Gibbons
Material Science and Engineering, University of Illinois at Urbana-Champaign
Materials Science and Engineering, University of Illinois, Urbana-Champaign, Materials Science, Argonne National Laboratory, Physics, University of California, San Diego
Materials Science and Engineering, University of Illinois at Urbana-Champaign
Takaaki Dohi
Research Institute of Electrical Communications, Tohoku University
Vivek P Amin
Physics, Indiana University - Purdue University Indianapolis
Fei Xue
National Institute of Standards and Technology
Nanoscale Processes and Measurements Group, National Institute of Standards and Technology, Institute for Research in Electronics and Applied Physics & Maryland Nanocenter, U
Hanu Arava
Materials Science and Engineering, Northwestern University, Materials Science Division, Argonne National Laboratory
Hilal Saglam
Materials Science Division, Argonne National Laboratory
Applied Physics, Yale University
Department of Applied Physics, Yale University
Yale University
Yuzi Liu
Center for Nanoscale Materials, Argonne National Laboratory
John Pearson
Argonne National Laboratory
Materials Science Division, Argonne National Laboratory
Argonne National Lab
Amanda K Petford-Long
Northwestern University, Northwestern Argonne Institute of Science and Engineering (NAISE), Argonne National Laboratory, Materials Science Division (MSD)
Materials Science and Engineering, Northwestern University, Materials Science Division, Argonne National Laboratory
Paul M Haney
National Institute of Standards and Technology
Physical Measurement Laboratory, National Institute of Standards and Technology
Nanoscale Processes and Measurements Group, National Institute of Standards and Technology
Mark D Stiles
Physical Measurement Laboratory, National Institute of Standards and Technology
Alternative Computing Group, National Institute of Standards and Technology
Shunsuke Fukami
Laboratory for Nanoelectronics and Spintronics, RIEC,CSIS, CSRN, CIES, and WPI-AIMR, Tohoku University, Japan
Research Institute of Electrical Communications, Tohoku University
Axel F Hoffmann
University of Illinois at Urbana-Champaign
Material Science and Engineering, University of Illinois at Urbana-Champaign
Materials Science and Engineering, University of Illinois, Urbana-Champaign
Argonne National Laboratory
Materials Science and Engineering, University of Illinois at Urbana-Champaign
