Crystal structure and magnetic properties of Cr-Doped AlN films with various Cr concentrations

Yasushi Endo, Takanobu Sato, Yoshio Kawamura, Masahiko Yamamoto

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We have studied the crystal structure and magnetic properties of Cr-doped AlN (Al1-xCrxN) films in the range of Cr concentration (x) of 0.04-0.37. The film changes from a wurtzite-type AlN phase for x = 0.04-0.20 to a wurtzite-type AlN phase and zinc-blende-type AlN mixed phase for x = 0.24, and further to only the zinc-blende-type AlN phase with increasing x. The Cr atoms are considered to occupy Al sites in spite of the change of AlN phase with x. Room-temperature (RT) ferromagnetism is not observed at any x. The magnetic state at 10 K of the film is considered to change from a paramagnetic state to a paramagnetic state or a superparamagnetic state, and further to a paramagnetic state as x increases. Ferromagnetic state is not observed at 10 K regardless of x.

Original languageEnglish
Pages (from-to)465-470
Number of pages6
JournalMaterials Transactions
Volume48
Issue number3
DOIs
Publication statusPublished - 2007 Mar
Externally publishedYes

Keywords

  • Aluminum-nitride
  • Chromium concentration
  • Crystal structure
  • Magnetic state
  • Room-temperature ferromagnetism

ASJC Scopus subject areas

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

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