Analysis of Reliable Ultrafast Precessional Switching in the Presence of Transverse Applied Magnetic Fields

The precessional switching process of a magnetic nanoparticle subject to external field pulses applied along the hard-axis is considered. The dependence of the switching probability on the external field pulse duration is investigated. The further application of a transverse field along the intermediate anisotropy axis of the particle is used to control the quasi-random relaxation of magnetization to the reversed magnetization state. The critical field amplitudes to realize the switching are analytically determined. The robustness of the theoretical prediction is verified by macrospin numerical simulations.