Magnetization reversal in the anisotropy-dominated regime using time-dependent magnetic fields

TL;DR

This paper demonstrates that magnetization reversal in anisotropy-dominated regimes can be efficiently achieved using frequency-swept magnetic pulses, enabling nanosecond switching times with modest fields.

Contribution

The study introduces an analytical approach to optimize chirped r.f. magnetic pulses for magnetization reversal, outperforming simple sinusoidal pulses.

Findings

Chirped pulses enable faster switching than sinusoidal ones.

Switching times of nanoseconds are achievable with small r.f. fields.

The optimal pulse shape can be derived analytically.

Abstract

We study magnetization reversal using various r.f. magnetic pulses. We show numerically that switching is possible with simple sinusoidal pulses; however the optimum approach is to use a frequency-swept (chirped) r.f. magnetic pulse, the shape of which can be derived analytically. Switching times of the order of nanoseconds can be achieved with relatively small r.f. fields, independent of the anisotropy's strength.