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Epitaxial thin films of Ru-substituted CoFe2O4 with a cubic spinel structure were fabricated on α-Al2O3 (001) substrates using pulsed laser deposition, and their magnetic and electric properties were investigated. The films showed room temperature ferrimagnetic behavior with hard magnetic features similar to those of non-Ru-substituted cobalt ferrite films. The electrical conductivity of the films was dramatically enhanced by the substitution of Ru. The anomalous Hall effect was observed in all films even at 300 K suggesting that carriers in the films are highly spin-polarized at room temperature as expected from a first-principles calculation.
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Iwamoto et al. (2012) studied this question.
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