Ferromagnetic resonance force microscopy of a permalloy film

We describe Ferromagnetic Resonance Force Microscopy (FMRFM) experiments performed on a 50 nm thick permalloy film. We have studied the evolution of the FMRFM force spectra as a function of temperature. The temperature-dependent studies show a decrease of the ferromagnetic resonance field with increasing temperature which we attribute to the temperature-dependent changes of the saturation magnetization. The experiments demonstrate the potential of FMRFM to study temperature dependent ferromagnetic resonance phenomena. We analyzed the FMRFM force spectra evolution as a function of the probe-film distance and performed numerical simulations of the intensity of the FMRFM probe-sample interaction force. Excellent agreement between the experimental data and the simulation results provides the new insight into the mechanism of the FMR mode excitation in an FMRFM experiment.