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

Abstract

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

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Cited by in corpus (4)

• Optimal control of magnetization reversal in a monodomain particle by means of applied magnetic field
• Thermally assisted magnetization reversal of a magnetic nanoparticle driven by a down-chirp microwave field pulse
• Fast magnetization reversal of a magnetic nanoparticle induced by cosine chirp microwave field pulse
• Shape anisotropy effect on magnetization reversal induced by linear down chirp pulse