Magnetic behaviour of Co-AlN thin films with various Co concentrations

Takanobu Sato, Yasushi Endo, Yu Shiratsuchi, Masahiko Yamamoto

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We have investigated the magnetic behaviour of Co-AlN (Al1-xCoxN) thin films with various Co concentrations (x) of 0.06-0.25. For all Co concentrations, the hysteresis are not observed in any magnetization curves at the temperatures of 10-300 K. For the Co concentration x below 0.10, the magnetization is almost zero at the temperature above 50 K and increases slightly with decreasing temperature below 50 K. In contrasts, for the Co concentration x above 0.17, the peak temperature in zero-field-cooled magnetization can be observed and its value increases from around 5 to 10 K with increasing Co concentration. On the basis of these results, it is found that the room-temperature ferromagnetism is not observed at any Co concentrations. It is suggested that the magnetic behaviour at the temperature more than 10 K changes from paramagnetism or spin-glass state to superparamagnetism or spin-glass state with increasing Co concentration.

Original languageEnglish
Pages (from-to)e735-e737
JournalJournal of Magnetism and Magnetic Materials
Volume310
Issue number2 SUPPL. PART 3
DOIs
Publication statusPublished - 2007 Mar 1
Externally publishedYes

Keywords

  • AlN
  • Diluted magnetic semiconductor
  • FC-ZFC magnetization
  • Magnetic behaviour

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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