2003/10/21 by G. Brown, S. M. Stinnett, M. A. Novotny +1 · 1 citation
Engineering · Materials Science · Physics and Astronomy · #Magnetic Properties of Alloys #Magnetic properties of thin films #Metallic Glasses and Amorphous Alloys #cond-mat.mtrl-sci #cond-mat.stat-mech
paper · pdf · doi:10.1063/1.1689151
3 revtex pages, 5 figures, proceedings 9th joint MMM-Intermag
arxiv created 2003/10/21 · openalex publication_date 2004/05/17 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The continued increase in areal densities in magnetic recording makes it crucial to understand magnetization reversal in nanoparticles. We present finite-temperature micromagnetic simulations of hysteresis in Fe nanopillars with the long axis tilted at angles from 0° to 90° to the applied sinusoidal field. The field period is 15 ns, and the particle size is 9×9×150 nm. The system is discretized into a rectangular pillar of 7×7×101 spins each with uniform magnetization. At low angles, reversal begins at the endcaps and proceeds toward the center of the particle. At 90° reversal proceeds along the entire length of the particle (save at the ends). The switching field was observed to increase over the entire range of angles, consistent with recent experimental observations. A second, lower-resolution micromagnetic simulation with 1×1×17 spins, does not agree with experiment, but shows behavior very similar to that of the Stoner–Wohlfarth model of coherent rotation.