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We have successfully demonstrated electrical charging using the electromotiveforce (EMF) generated in a ferromagnetic metal (FM) film under ferromagneticresonance (FMR). In the case of Ni80Fe20 films, electrical charge due to theEMF generated under FMR can be accumulated in a capacitor; however, the amountof charge is saturated well below the charging limit of the capacitor.Meanwhile in the case of Co50Fe50, electrical charge generated under FMR can beaccumulated in a capacitor and the amount of charge increases linearly with theFMR duration time. The difference between the Ni80Fe20 and Co50Fe50 films isdue to the respective magnetic field ranges for the FMR excitation. When the FMfilms were in equivalent thermal states during FMR experiments, Co50Fe50 filmscould maintain FMR in a detuned condition, while Ni80Fe20 films were outsidethe FMR excitation range. The EMF generation phenomenon in an FM film under FMRcan be used an energy harvesting technology by appropriately controlling thethermal conditions of the FM film.

An energy harvesting technology controlled by ferromagnetic resonance