Abstract
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.
Original language | English (US) |
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Pages (from-to) | 453-456 |
Number of pages | 4 |
Journal | Scripta Materialia |
Volume | 53 |
Issue number | 4 |
DOIs | |
State | Published - Aug 2005 |
Keywords
- Discrete pinning
- Exchange interaction
- L1 magnets
- Magnetization reversal
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys