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

Micromagnetic investigation was performed on the influence of neighboring cells in a conventional rectangular array to the switching current density $(Jc)$ in the current-induced magnetization switching. We found that the $Jc$ 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 $Jc$ 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 $Jc$ due to the resonant precession.