Micromagnetic investigation of the sub-nanosecond magnetic pulse driven domain wall motion in CoFeB nanowire

Penulis: Dede Djuhana , Bambang Soegijono, Dong-Hyun Kim
We report our micromagnetic simulations based on Landau-Lifshitz-Gilbert (LLG) equation for CoFeB nanowire which was exposed by sub-nanosecond magnetic pulse with varied pulse width between 100 and 1000 ps. It is found that the Walker Breakdown field (H WB ) shifted as the field pulse duration decreased and reached at the highest value in case of 100 ps pulse width, then decreased steeply with respect to the pulse width up to 400 ps. H WB values are not significantly dependent for pulses longer than 500 ps. It is observed that, below the H WB , the exchange energy is larger than the demagnetization energy in the wider nanowire. By energy density analysis, it is understood that the increase of H WB values in the cases of narrower pulse width was to compensate the energy needed to move the DW.

Current Applied Physics 27 (2021) 98–102

ISSN / ISBN / IBSN : 1567-1739

DOI: https://doi.org/10.1016/j.cap.2021.04.017

No. Arsip : LIPI-20220406