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Magnetism and Faraday Rotation in Oxygen-Deficient Polycrystalline and Single-Crystal Iron-Substituted Strontium Titanate

Author(s)
Goto, Taichi; Kim, Dong Hun; Sun, Xueyin; Florez, Juan M.; Ong, Shyue Ping; Vargas, Patricio; Ackland, Karl; Stamenov, Plamen; Inoue, Mitsuteru; Coey, J. Michael D.; Onbasli, Mehmet Cengiz; Aimon, Nicolas; Tuller, Harry L; Dionne, Gerald F.; Ross, Caroline A; ... Show more Show less
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Abstract
Both polycrystalline and single-crystal films of iron-substituted strontium titanate, Sr(Ti[subscript 0.65]Fe[subscript 0.35])O[subscript 3−δ], prepared by pulsed laser deposition, show room-temperature magnetism and Faraday rotation, with the polycrystalline films exhibiting higher saturation magnetization and Faraday rotation. The magnetic properties vary with the oxygen pressure at which the films are grown, showing a maximum at pressures of approximately 4  μ Torr at which the unit-cell volume is largest. The results are discussed in terms of the oxygen stoichiometry and corresponding Fe valence states, the structure and strain state, and the presence of small-volume fractions of metallic Fe in single-crystal films grown at the optimum deposition pressure. Integration of magneto-optical polycrystalline films on an optical-waveguide device demonstrates a nonreciprocal phase shift.
Date issued
2017-02
URI
http://hdl.handle.net/1721.1/107187
Department
Lincoln Laboratory; Massachusetts Institute of Technology. Department of Materials Science and Engineering
Journal
Physical Review Applied
Publisher
American Physical Society
Citation
Goto, Taichi et al. “Magnetism and Faraday Rotation in Oxygen-Deficient Polycrystalline and Single-Crystal Iron-Substituted Strontium Titanate.” Physical Review Applied 7.2 (2017): n. pag. © 2017 American Physical Society
Version: Final published version
ISSN
2331-7019

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