Electric-field tuning of magnetic anisotropy in the artificial multiferroic Fe₃O₄/PMN–PT heterostructure

Abstract

Modulation of the magnetic anisotropy by the electric field in epitaxial Fe 3 O 4 /PMN-PT multiferroic heterostructure is studied, which shows that the coercive field of Fe 3 O 4 thin films can be decreased from 368 to 113 Oe by applying an electric field in PMN-PT [011] direction. Meanwhile, most shift of ferromagnetic resonance (FMR) field H r ( H r,[011] ) can reach up to −483 Oe by applying an external electric field. The giant shift of H r from 251 to 9681 Oe is obtained as the sample rotated from θ = 90°( H // [011] to θ = 0°(H // [100]) when the electric field was applied in Fe 3 O 4 /PMN-PT heterostructure. IMPACT STATEMENTA giant shift of ferromagnetic resonance field was obtained by simultaneously applying an external electric field and a rotating sample along axes both parallel and perpendicular to the magnetic field.

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