Abstract
Structural and magnetic properties of core-shell type L10 FePt/Fe exchange coupled nanocomposites are studied systematically. Core-shell nanocomposites with FePt core and Fe shell are obtained by depositing Fe cap layers on granular L10 FePt films. Epitaxial growth is disclosed by x-ray diffraction. Coercivity decreases drastically for FePt/Fe with the thickness increase of Fe cap layers. The coercivity reduction is due to the much increased domain wall area pinned and compressed at the soft-hard interface, and the tilted effective easy axis because of the presence of demagnetized energy. L10 FePt/Fe with a 3 nm Fe layer has high thermal stability and gain factor for media applications.
| Original language | English (US) |
|---|---|
| Article number | 083907 |
| Journal | Journal of Applied Physics |
| Volume | 109 |
| Issue number | 8 |
| DOIs | |
| State | Published - Apr 15 2011 |
Bibliographical note
Funding Information:The authors acknowledge the partial support by Western Digital through the membership of the Center for Micromagnetics and Information Technologies (MINT) and partial support by the Information Storage Industry Consortium (INSIC). The authors also thank Dr. Kumar Srinivasan and Gerardo Berteroand from WDC. The NSF MRSEC and Characterization Facility, Institute of Rock Magnetism Facilities and Department of Chemical Engineering and Materials Science are gratefully acknowledged for structural and magnetic measurements. One of the authors appreciates Siegfried Rabie for writing and grammar assistance.