Computational approach to finite size and shape effects in iron nanomagnets

Details Computational approach to finite size and shape effects in iron nanomagnets Computational approach to finite size and shape effects in iron nanomagnets

2007-01-10

arxiv.org/abs/cond-mat/0701225v1

Physics

Condensed Matter

Materials Science

15 pages, 9 figures

Scientific paper

10.1016/j.jmmm.2007.05.041

We develop and validate a computational approach to nanomagnets. It is built on the spin wave approximation to a Heisenberg ferromagnet whose parameters can be calculated from a first principles theory (e.g. density functional theory). The method can be used for high throughput analysis of a variety of nanomagnetic materials. We compute the dependence of the magnetization of an iron nanomagnet on temperature, size and shape. The approach is applied to nanomagnets in the range of 432 atoms to 59 million atoms, a size which is several orders of magnitude beyond the scalability of density functional theory.

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