Abstract
We have studied the orientation and magnetic properties of FePt and CoPt films deposited by electron-beam co-evaporation on MgO(1 1 0) single-crystal substrates at substrate temperatures from 500 to 700 °C. We observed that long-range chemical ordering of the L10 structure occurred over the entire range of substrate temperatures in FePt films and at 600 °C and up in CoPt films. Growth of FePt and CoPt yielded epitaxial films with cube-on-cube orientation of the pseudo-cubic L10 lattice with respect to the cubic MgO. X-ray diffraction patterns and magnetization loops of the FePt and CoPt films revealed the existence of L10 domains with the tetragonal c axis inclined at 45° to the film plane, orientations (0 h h) and (h 0 h), as well as L10 domains with the tetragonal c axis in the plane of the film, orientation (h h 0). The FePt and CoPt films for which X-ray diffraction indicated tetragonal phase was present all exhibited hard magnetic properties with easy axis along the [0 0 1] substrate direction as well as large in-plane magnetocrystalline anisotropy.
Original language | English |
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Pages (from-to) | 139-143 |
Number of pages | 5 |
Journal | Materials Science and Engineering B: Solid-State Materials for Advanced Technology |
Volume | 142 |
Issue number | 2-3 |
DOIs | |
Publication status | Published - 2007 Sep 25 |
Externally published | Yes |
Keywords
- Epitaxial film
- L10 phase
- Magnetic film
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering