Abstract
Atomic interdiffusion between FePt and Fe3O4 nanoparticles in annealed FePt-based nanocomposite magnets has been studied by means of structural and magnetic characterizations. The results show that the Fe3Pt phase is formed during the annealing only when the mass ratio x of Fe3O4/FePt is larger than 1/20. When x ≤ 1/20, only FePt single phase is formed. It is interesting to find that the coercivity of the annealed samples increases with a small addition of Fe3O 4 before the formation of the Fe3Pt phase. This magnetic hardening behaviour indicates that the composition of the FePt phase can be further adjusted via the post annealing process. The characteristic of recoil loops and Henkel plots also give evidence for the transition from single-phase FePt magnets to nanocomposite magnets with the addition of Fe3O 4.
Original language | English (US) |
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Article number | 003 |
Pages (from-to) | 712-716 |
Number of pages | 5 |
Journal | Journal of Physics D: Applied Physics |
Volume | 40 |
Issue number | 3 |
DOIs | |
State | Published - Feb 7 2007 |
Externally published | Yes |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Acoustics and Ultrasonics
- Surfaces, Coatings and Films