Microstructure and magnetic property of Fe-Al2O3 granular films

B. Bian, Y. Hirotsu, A. Makino

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Granular magnetic films composed of randomly or highly oriented Fe nanoparticles covered with amorphous Al2O3 have been synthesized by electron beam deposition. The highly oriented Fe nanocrystals are prepared by taking advantage of the epitaxial growth of α-Fe on <100> oriented Au "seed" nanoparticles, which are epitaxially grown on a (100)NaCl substrate. The magnetic coercivity of the granular films with randomly oriented Fe nanocrystals is inversely proportional to the intergranular distance. For the film with an average Fe thickness of about 3 nm, the coercivity and the electrical resistivity are 944 A/m and 154000 μΩcm, respectively. Coercivity of highly oriented granular films with similar average Fe thickness is generally one order higher than that of granular films with randomly oriented Fe particles. It is shown that the size, intergranular distance and crystalline orientation can be controlled by epitaxial growth on "seed" particles.

Original languageEnglish
Pages (from-to)1057-1066
Number of pages10
JournalNanostructured Materials
Volume8
Issue number8
DOIs
Publication statusPublished - 1997 Dec
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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