International Journal of Physics | Vol. 1, No. 11, November 2010 | pp. 87–94
DOI: 10.46882/2010/IJP/000011
Article Type: Original Research Paper
Title: Microscopic Simulation of Domain Wall Dynamics in Ferromagnetic Nanowires with Dzyaloshinskii-Moriya Interactions
Names of Authors: E. O. Amadi¹, G. B. Dupont²
Authors’ Affiliations: ¹Department of Physics, University of Nigeria, Nsukka, Nigeria; ²Laboratoire de Physique des Solides, Université Paris-Sud, Orsay, France
Abstract: Controlling the movement of domain walls in ferromagnetic nanowires is a foundational element for developing high-density racetrack memory and spintronic logic systems. This study utilizes micromagnetic simulations to investigate the velocity and stability of Néel-type domain walls driven by spin-orbit torques in the presence of interfacial Dzyaloshinskii-Moriya interactions (DMI). The system dynamics are modeled by solving the Landau-Lifshitz-Gilbert-Slonczewski equation via a high-performance finite-difference grid. The simulations explore nanowires with a width of 100 nm and a thickness of 2 nm, assuming DMI values ranging from 0.5 to 2.5 mJ/m². Our results show that strong interfacial DMI stabilizes the Néel domain wall configuration against the Walker breakdown phenomenon, allowing steady-state propagation speeds to exceed 450 m/s under an applied current density of 1.5 x 10¹² A/m². We find that the domain wall velocity depends linearly on the current density until reaching a critical injection threshold, where structural deformation occurs. Pinning effects caused by surface roughness and geometric notches are also evaluated, showing that a minimum depinning current of 0.35 x 10¹² A/m² is required to release trapped walls. These numerical insights provide useful parameter guidelines for optimizing the operational speed and power consumption of domain-wall-based non-volatile memory architectures.
Keywords: Micromagnetic simulation; Domain wall dynamics; Dzyaloshinskii-Moriya interaction; Spin-orbit torque; Ferromagnetic nanowires; Racetrack memory; Landau-Lifshitz-Gilbert equation; Spintronics.
Manuscript Timeline: Received: August 11, 2010; Revised: September 23, 2010; Accepted: October 14, 2010; Published: November 05, 2010.
Citation: Amadi, E. O., & Dupont, G. B. (2010). Microscopic Simulation of Domain Wall Dynamics in Ferromagnetic Nanowires with Dzyaloshinskii-Moriya Interactions. International Journal of Physics, 1(11), 87–94.
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