期刊
NANOMATERIALS
卷 11, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/nano11030800
关键词
pseudo-exchange bias; minor loop; micromagnetic simulation; OOMMF; spintronics
类别
资金
- Open Access Publication Fund of Bielefeld University of Applied Sciences
Micromagnetic simulations on sputtered nanoparticles with different structures at zero temperature reveal that small deviations in systems due to random anisotropy orientations in different grains can lead to significant deviations in magnetization reversal processes and hysteresis loops, as well as distinctly asymmetric, horizontally shifted hysteresis loops in purely ferromagnetic nanoparticles.
Horizontally shifted and asymmetric hysteresis loops are often associated with exchange-biased samples, consisting of a ferromagnet exchange coupled with an antiferromagnet. In purely ferromagnetic samples, such effects can occur due to undetected minor loops or thermal effects. Simulations of ferromagnetic nanostructures at zero temperature with sufficiently large saturation fields should not lead to such asymmetries. Here we report on micromagnetic simulations at zero temperature, performed on sputtered nanoparticles with different structures. The small deviations of the systems due to random anisotropy orientations in the different grains can not only result in strong deviations of magnetization reversal processes and hysteresis loops, but also lead to distinctly asymmetric, horizontally shifted hysteresis loops in purely ferromagnetic nanoparticles.
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