Study of nonlinear ferromagnetic resonance in a nanoscale magnetic tunnel junction using diode effect

We use the diode effect caused by magnetization excitation in a microwave magnetic field to analyze the ferromagnetic resonance and magnetization switching in a nanoscale perpendicular magnetic tunnel junction. The cone angle and the lag angle with respect to the applied microwave field of the magnetization precession are accurately estimated by utilizing the homodyne nature of the diode effect. We observe a ferromagnetic resonance peak of the cone angle accompanied by an increase in the lag angle, and a nonlinear shift of the peak position with increasing the microwave field amplitude. We also reveal magnetization switching assisted by ferromagnetic resonance excitation.