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Phys Rev Lett. 2016 Mar 04;116(9):097203. doi: 10.1103/PhysRevLett.116.097203. Epub 2016 Mar 03.

Full Electroresistance Modulation in a Mixed-Phase Metallic Alloy.

Physical review letters

Z Q Liu, L Li, Z Gai, J D Clarkson, S L Hsu, A T Wong, L S Fan, M-W Lin, C M Rouleau, T Z Ward, H N Lee, A S Sefat, H M Christen, R Ramesh

Affiliations

  1. Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  2. Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA.
  3. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  4. Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA.
  5. Department of Physics, University of California, Berkeley, California 94720, USA.
  6. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
  7. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.

PMID: 26991197 DOI: 10.1103/PhysRevLett.116.097203

Abstract

We report a giant, ∼22%, electroresistance modulation for a metallic alloy above room temperature. It is achieved by a small electric field of 2  kV/cm via piezoelectric strain-mediated magnetoelectric coupling and the resulting magnetic phase transition in epitaxial FeRh/BaTiO_{3} heterostructures. This work presents detailed experimental evidence for an isothermal magnetic phase transition driven by tetragonality modulation in FeRh thin films, which is in contrast to the large volume expansion in the conventional temperature-driven magnetic phase transition in FeRh. Moreover, all the experimental results in this work illustrate FeRh as a mixed-phase model system well similar to phase-separated colossal magnetoresistance systems with phase instability therein.

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