Change of magnetic properties and structure in Fe3O4 films on Si substrates with annealing temperature

Sayeeduzzaman Syed, Yasushi Endo, Takanobu Sato, Yoshio Kawamura, Ryoichi Nakatani

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We have investigated the magnetic properties and structure of Fe 3O4 films on Si substrates before and after annealing at various temperatures, Ta. The saturation magnetization and the coercivity in the Fe3O4 films are observed at all T a. They markedly increase with increasing Ta up to 873 K, and their values become maximum at Ta = 873 K. Furthermore, they slightly decrease above Ta = 873 K. The Fe3O4 phase mainly exists in the films at all Ta. In addition, the α-Fe2O3 phase (hematite) is also formed in the films above Ta = 873 K. On the basis of these results, it is found that the growth of Fe3O4 phase by annealing is mainly dominant in the change of magnetic properties in the Fe3O4 film up to Ta = 873 K and that the formation of α-Fe2O 3 phase influences the change of magnetic properties in the Fe 3O4 film above Ta = 873K.

Original languageEnglish
Pages (from-to)175-178
Number of pages4
JournalMaterials Transactions
Volume49
Issue number1
DOIs
Publication statusPublished - 2008 Jan 1

Keywords

  • Annealing
  • Hematite
  • Magnetite
  • Saturation magnetization

ASJC Scopus subject areas

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

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