Materials and Nanoscience, Nebraska Center for (NCMN)


Date of this Version



Published in Scripta Materialia, Volume 53, Issue 4 , August 2005, Pages 453-456. doi:10.1016/j.scriptamat.2005.04.035 Copyright © 2005 Acta Materialia Inc. Published by Elsevier Ltd. on behalf of Acta Materialia Inc. Used by permission.


Magnetization processes in particulate L10 FePt nanostructures are investigated by model calculations and numerical simulations. The systems considered include anisotropic nanograins embedded in non-magnetic matrix; randomly oriented nanoclusters embedded in a C matrix, and nanocomposites of FePt particles in a semi-hard matrix. The reversal mechanisms depend on both intra- and intergranular features. Quasi-coherent rotation dominates the reversal in weakly-coupled granular magnets, but interface imperfections yield a disproportionately strong coercivity reduction. Strong intergranular exchange leads to a transition to a discrete pinning regime, which is accompanied by a coercivity maximum.