Low-Field Magnetic Domain Wall Motion and Mobility in CoFeB Nanostripes Influenced by The Dzyaloshinskii-Moriya Interaction

Raditya Nugraha; Candra Kurniawan; Adam Badra  Cahaya; Dwiria  Wahyuni; Dede Djuhana

doi:10.5614/j.math.fund.sci.2026.58.1.3

Authors

Raditya Nugraha Department of Physics, FMIPA Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
Candra Kurniawan Research Center for Energy Materials, National Research and Innovation Agency (BRIN), KST B.J. Habibie, Tangerang Selatan, 15314, Indonesia
Adam Badra Cahaya Department of Physics, FMIPA Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
Dwiria Wahyuni Department of Physics, FMIPA Universitas Tanjungpura, Pontianak 78124
Dede Djuhana Department of Physics, FMIPA Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia

DOI:

https://doi.org/10.5614/j.math.fund.sci.2026.58.1.3

Keywords:

CoFeB, DMI, magnetic domain wall, micromagnetics, perpendicular magnetic anisotropy

Abstract

This work examines the effects of the Dzyaloshinskii?Moriya interaction (DMI) on low-field magnetic domain wall (DW) dynamics in perpendicular anisotropy CoFeB nanostripes driven by nanosecond magnetic field pulses. Micromagnetic simulations based on the Landau?Lifshitz equation were performed for DMI strengths from 0 to 1 mJ m? and pulse amplitudes of 0.1 to 1 mT, which are commonly regarded to be within the creep regime. The results show that DMI significantly enhances DW displacement and velocity, with a velocity enhancement of up to approximately eight times higher than in the absence of DMI, primarily due to the emergence of a chiral Nl wall configuration and an effective DMI field that increases DW mobility. However, this enhancement does not scale linearly with DMI strength. Instead, both velocity and displacement exhibit a clear saturation behavior beyond intermediate DMI values (~0.6 mJ m?). Mobility analysis, obtained by fitting simulation results to an analytical DW velocity model, indicates an increase of up to two orders of magnitude with DMI, followed by a similar plateau. These findings highlight a limit to DMI-induced enhancement in the low-field regime, with implications for optimizing DW-based spintronic devices.

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