Effects of strain and surfaces on the antiferromagnetic and ferromagnetic phases of thin film FeRh

ORAL

Abstract

FeRh undergoes an unusual antiferromagnetic (AFM) to ferromagnetic (FM) first order transition just above room temperature. This transition can be tuned by pressure, magnetic field, composition, and strain. The underlying source of the transition is still under much discussion, but it is clear from a variety of measurements that electronic structure, lattice, and magnetic excitations all play roles in contributing the underlying entropy difference and hence the competition between AFM and FM states. The surface and bottom interface of thin films are often found to be FM even while the bulk of the film is AFM. The source of this effect, along with the dependence of strain on both anisotropy and transition temperature will be presented and discussed.

–

Authors

  • Frances Hellman

    Physics Department, University of California, Berkeley, Department of Physics and Department of Materials Science and Engineering, University of California, Berkeley, University of California, Berkeley, Department of Physics, University of California, Berkeley

  • Catherine Bordel

    Physics Department, University of California, Berkeley, CA, Department of Physics, University of California, Berkeley

  • Chloe Baldasseroni

    Department of Materials Science and Engineering, University of California, Berkeley

  • Cory Antonakos

    Department of Chemistry, University of California, Berkeley

  • Oliver Schneider

    University of Wuerzburg, Germany

  • Gunar Pal

    Department of Physics, University of California, Davis

  • Sergio Valencia

    Helmholtz Zentrum-Berlin f\"ur Materialien und Energie GmbH, Albert-Einstein-Stra{\ss}e 15, D-12489 Berlin,

  • Akin Unal

    Helmholtz Zentrum-Berlin f\"ur Materialien und Energie GmbH, Albert-Einstein-Stra{\ss}e 15, D-12489 Berlin,

  • Florian Kronast

    Helmholtz Zentrum-Berlin f\"ur Materialien und Energie GmbH, Albert-Einstein-Stra{\ss}e 15, D-12489 Berlin,

  • Slavo Nemsak

    Department of Physics, University of California, Davis

  • Chuck Fadley

    Department of Physics, University of California, Davis

  • Julie Borchers

    NIST Center for Neutron Research, National Institute of Standard and Technology, Gaithersburg, MD, NIST

  • Brian Maranville

    NIST Center for Neutron Research, National Institute of Standard and Technology, Gaithersburg, MD