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Magnetotransport Properties across Verwey Transition in Fe3O4(111) Epitaxial Thin Films

We have studied the magnetoresistance (MR) of high-quality Fe3O4 thin films across the Verwey transition temperature (TV). Different from unsaturated MR observed in many other Fe3O4 films, MR of the present film at a high magnetic field is almost independent of the field, consistent with the fully saturated magnetization. The MR at low field strongly depends on temperature and orientation around TV: While out-of-plane MR sharply decreases from ∼+7 to ∼-5%, in-plane MR abruptly increases from ∼-6 to ∼+3% on cooling across TV.