Voltage-dependent ferromagnetic resonance in epitaxial multiferroic nanocomposites

摘要

We demonstrate electrical control of the ferromagnetic resonance u0001FMRu0002 in multiferroicnnanostructures. A series of heteroepitaxial BiFeO3 –NiFe2O4 nanocomposites of varying thicknessnare characterized using a microwave probe with magnetic and electric sensitivity. We apply annelectric field to a sample and observe voltage-driven shifts in the FMR frequency, reflecting anchange in magnetic anisotropy. The voltage dependence of the FMR linewidths is even morenpronounced, indicating the electric polarization can induce relatively large magnetic nonuniformitynin the material. These characteristics may lead to a class of rf filters where both frequency andnbandwidth are electrically tunable. © 2010 American Institute of Physics. u0003doi:10.1063/1.3319507