Enhanced switching current density due to resonant precession in current-induced magnetization switching

Abstract

Micromagnetic investigation was performed on the influence of neighboring cells in a conventional rectangular array to the switching current density (J(c)) in the current-induced magnetization switching. We found that the J(c) was increased regardless of the relative switching direction to the overall stray field. It is because the precession of the magnetization in the switching cell induces a resonant precession in neighboring cells through magnetostatic interaction. The resonant precession disturbs a fast reversal and results in the enhanced J(c) for a fixed pulse width. The enhancement increases as the distance between the cells decreases. Here we proposed a zigzag array which significantly suppresses the enhancement of J(c) due to the resonant precession.