Abstract
The processing, structure, and magnetism of highly coercive Sm-Co and FePt thin-film nanostructures are investigated. The structures include 1:5 based Sm-Co-Cu-Ti magnets, particulate FePt:C thin films, and FePt nanotubes. As in other systems, the coercivity depends on texture and imperfections, but there are some additional features. A specific coercivity mechanism in particulate media is a discrete pinning mode intermediate between Stoner-Wohlfarth rotation and ordinary domain-wall pinning. This mechanism yields a coercivity maximum for intermediate intergranular exchange and explains the occurrence of coercivities of 5 T in particulate Sm-Co-Cu-Ti magnets.
Original language | English (US) |
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Pages (from-to) | 227-230 |
Number of pages | 4 |
Journal | Journal of Magnetism and Magnetic Materials |
Volume | 290-291 PART 1 |
DOIs | |
State | Published - Apr 2005 |
Keywords
- Coercivity
- Domain-wall pinning
- Hard magnetic materials
- Magnetic nanostructures
- Magnetization reversal
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics