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Novel Spin Torques in Antiferromagnetic FeRh

ORAL

Abstract

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.

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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