Orientation and magnetic properties of FePt and CoPt films grown on MgO(1 1 0) single-crystal substrate by electron-beam coevaporation

Minghui Yu, H. Ohguchi, A. Zambano, I. Takeuchi, J. P. Liu, D. Josell, L. A. Bendersky

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

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 languageEnglish
Pages (from-to)139-143
Number of pages5
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume142
Issue number2-3
DOIs
Publication statusPublished - 2007 Sep 25

Keywords

  • Epitaxial film
  • L10 phase
  • Magnetic film

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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