To explore the possibility of FePt-based soft/hard nanocomposite magnets, granular films were prepared by annealing Pt/Fe, FePt/Fe, and FePt/Fe 3Pt multilayers. Although a high coercivity of 12 kOe was obtained by annealing the Fe3Pt/FePt multilayers, only a small remanence was obtained due to random orientation of L10 FePt grains. By introducing oxygen during the film deposition, a few nanometer oxide particles were observed within the FePt grains and Hc increased at the expense of Mr. A possible way to achieve a higher value of (BH)max is discussed based on the relationship between the microstructure and magnetic properties.
- Energy product
- Exchange coupling
- Nanocomposite magnets
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering