Theoretical studies on the influence of oxygen impurity upon magnetic properties of (Ga,Cr)N

Tatsuya Nakano, Masafumi Shirai, Yoshio Miura, Kazutaka Nagao

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We have studied the influence of O impurities upon magnetic properties of (Ga,Cr)N by using first-principles calculations based on the density-functional theory. Although the magnetic moment per Cr atom is enhanced, the ferromagnetic exchange interaction between Cr spins is reduced by co-doping with O into (Ga,Cr)N. In particular, the reduction is remarkable when the doped O atom forms a Cr-O-Cr complex. The role of O impurity is similar to that of N vacancy (VN), however, the O impurities could degrade the ferromagnetic stability of (Ga,Cr)N more seriously than the N vacancies since the formation energy of the Cr-O-Cr complex is much lower than that of the Cr-VN-Cr complex.

Original languageEnglish
Pages (from-to)2155-2157
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume310
Issue number2 SUPPL. PART 3
DOIs
Publication statusPublished - 2007 Mar 1

Keywords

  • (Ga,Cr)N
  • Exchange interaction
  • First-principles calculation
  • Oxygen impurity
  • Spintronics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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