Abstract
The magnetic properties of permanent magnetic nanocomposites are investigated both experimentally and by model calculations. Rare-earth transition-metal films and nanocomposite thin films containing a L10 hard phase (PtFe) have been prepared by plasma sputtering and heat treatment. By choosing suitable heat-treatment processes a nearly ideal nanostructure and high energy products of up to about 50 MGOe have been achieved for the Fe-Pt system. The behavior of the nanocomposites is discussed in terms of a model applicable to nearly ideal magnets, where there are no pronounced shoulders in the hysteresis loops. Analytic expressions for M(H) are obtained for a number of cases, and it is discussed how the loops depend on the micromagnetic parameters of the involved phases. A novel aspect of magnetic nanostructures is that very small magnetic grains exhibit very large energy products, even if they are intrinsically soft-magnetic.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 335-346 |
| Number of pages | 12 |
| Journal | Materials Research Society Symposium - Proceedings |
| Volume | 577 |
| DOIs | |
| State | Published - 1999 |
| Event | Proceedings of the 1999 MRS Spring Meeting - Symposium H: Advanced Hard Magnets-Principles, Materials, and Processing - Symposium I: Amorphous and Nanocrystalline Materials for Hard and Soft Magnetic Applications - San Francisco, CA, USA Duration: Apr 5 1998 → Apr 8 1998 |
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering