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25 April 2024

» arxiv » 1702.4306

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Full Electroresistance Modulation in a Mixed-Phase Metallic Alloy
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 ;
Date:	14 Feb 2017
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/BaTiO3 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.
Source:	arXiv, 1702.4306
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