Dipolar interactions in magnetic nanowires aggregates
Abstract
We investigate the role of dipolar interactions on the magnetic properties of nanowires aggregates. Micromagnetic simulations show that dipolar interactions between wires are not detrimental to the high coercivity properties of magnetic nanowires composites even in very dense aggregates. This is confirmed by experimental magnetization measurements and Henkel plots which show that the dipolar interactions are small. Indeed, we show that misalignment of the nanowires in aggregates leads to a coercivity reduction of only 30%. Direct dipolar interactions between nanowires, even as close as 2 nm, have small effects (maximum coercivity reduction of ~15%) and are very sensitive to the detailed geometrical arrangement of wires. These results strenghten the potential of magnetic composite materials based on elongated single domain particles for the fabrication of permanent magnetic materials.
Cite
@article{arxiv.1109.3174,
title = {Dipolar interactions in magnetic nanowires aggregates},
author = {Thomas Maurer and Fatih Zighem and Weiqing Fang and Frédéric Ott and Grégory Chaboussant and Yaghoub Soumare and Kahina Ait Atmane and Jean-Yves Piquemal and Guillaume Viau},
journal= {arXiv preprint arXiv:1109.3174},
year = {2013}
}
Comments
7 pages, 8 figures, submitted to Journal of Applied Physics