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We investigate the magnetization reversal of single-domain magneticnanoparticle driven by linear down-chirp microwave magnetic field pulse.Numerical simulations based on the Landau-Lifshitz-Gilbert equation reveal thatsolely down-chirp pulse is capable of inducing subnanosecond magnetizationreversal. With a certain range of initial frequency and chirp rate, therequired field amplitude is much smaller than that of constant-frequencymicrowave field. The fast reversal is because the down-chirp microwave fieldacts as an energy source and sink for the magnetic particle before and aftercrossing over the energy barrier, respectively. Applying a spin-polarizedcurrent additively to the system further reduces the microwave field amplitude.Our findings provide a new way to realize low-cost and fast magnetizationreversal.

Subnanosecond magnetization reversal of magnetic nanoparticle driven by chirp microwave field pulse