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Magnetism and Faraday Rotation in Oxygen-Deficient Polycrystalline and Single-Crystal Iron-Substituted Strontium Titanate
Author(s) -
Taichi Goto,
Dong Hun Kim,
Xueyin Sun,
Mehmet C. Onbaşlı,
Juan M. Florez,
Shyue Ping Ong,
P. Vargas,
Karl Ackland,
Plamen Stamenov,
Nicolas M. Aimon,
Mitsuteru Inoue,
Harry L. Tuller,
Gerald F. Dionne,
J. M. D. Coey,
Caroline A. Ross
Publication year - 2017
Publication title -
physical review applied
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.883
H-Index - 75
eISSN - 2331-7043
pISSN - 2331-7019
DOI - 10.1103/physrevapplied.7.024006
Subject(s) - magnetism , faraday effect , materials science , strontium titanate , condensed matter physics , faraday cage , strontium , crystallite , ferroelectricity , oxygen , nanotechnology , optoelectronics , magnetic field , physics , dielectric , thin film , metallurgy , quantum mechanics , nuclear physics
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.National Science Foundation (U.S.) (Grants DMR1419807 and ECCS1607865)Semiconductor Research Corporation. Function Accelerated nanoMaterial Engineerin

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