Abstract
We used a magnetic tunnel junction (MTJ) to study the microwave-assisted switching (MAS) of a perpendicular magnetic nanodot. Because the sample structure enables the direct observation of fast magnetization dynamics through MTJ signals, the switching behavior is examined in relation with the induced magnetization excitation. By utilizing the MTJ signals, we observe several ferromagnetic resonance (FMR) modes and identify the lowest FMR mode as the cause of switching field reduction. The switching field decreases as the microwave frequency increases, and this frequency–magnetic field relationship coincides with that of the lowest FMR mode near a critical frequency. We also investigate the size dependence of MAS.
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