Minimal field requirement in precessional magnetization switching

作者：Xiao D^*; Tsoi M; Niu Q

来源：Journal of Applied Physics, 2006, 99(1): 013903.

DOI：10.1063/1.2161421

We investigate the minimal field strength in precessional magnetization switching using the Landau-Lifshitz-Gilbert equation in undercritically damped systems. It is shown that precessional switching occurs when localized trajectories in phase space become unlocalized upon application of field pulses. By studying the evolution of the phase space, we obtain the analytical expression of the critical switching field in the limit of small damping for a magnetic object with biaxial anisotropy in both the easy and hard plane. We also calculate the switching times for the zero damping situation by numerical means. We show that applying the field along the medium axis is good for both small field and fast switching times.

• 出版日期2006-1-1