Abstract
Indirect exchange spring in magnetron-sputtered FePt/Ru/Fe trilayers as well as multilayers have been investigated. Interlayer exchange coupling between FePt and Fe layers through a Ru spacer was obtained with an oscillation period of about 1 nm. Magnetic properties of FePt thin films with different nominal thicknesses deposited on MgO (1 1 0) substrates at 400 °C showed that 12.5 nm thick FePt film had both high coercivity and good squareness. In FePt/Ru/Fe trilayers, ferromagnetic coupling between the two magnetic layers was achieved with a 0.5 nm thick Ru layer, and the saturated magnetization was largely improved after using interlayer exchange coupling with Fe while the coercivity changed little, which indicated that indirect exchange spring was a promising approach for high-performance magnets. Multilayers with such structures had also been studied with different thickness ratio of the two magnetic layers and strong exchange coupling was achieved as Fe thickness ratio increased.
| Original language | English |
|---|---|
| Pages (from-to) | 40-46 |
| Number of pages | 7 |
| Journal | Journal of Magnetism and Magnetic Materials |
| Volume | 302 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2006 Jul 1 |
Keywords
- Exchange spring
- FePt
- Interlayer exchange coupling
- Magnetization
- Permanent magnet
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics