Experimental evidence of ferromagnetic resonance in magnetoimpedance measurements

Detailed impedance measurements as a function of the applied magnetic field in an amorphous ribbon are presented for frequencies up to 3 GHz. The shape of the impedance versus field curves is greatly modified by the appearance of a contribution whose maximum is displaced toward higher fields as frequency increases. The analysis of the data reveals that the origin of this contribution is the ferromagnetic resonance induced by the alternating magnetic field associated with the flow of the electrical current employed in the impedance measurements.