Compositional optimization of magnetite thin films prepared by rf sputtering from a composite target of wüstite and Ge

Seishi Abe, Shintaro Nakamura, Shigehiro Ohnuma

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This study investigated the compositional optimization of magnetite (Fe3O4) thin films containing a small amount of Ge to enhance magnetization. No substrate bias was applied during deposition. In a pure Ar atmosphere, the film structure changed from the phase mixture of magnetite and wüstite (Fe1 - xO) to the weak appearance of wüstite with increasing Ge content. The antiferromagnetic wüstite thus obtained was employed as a starting material to prepare single-phase magnetite, and a gas mixture of Ar and O2 was then applied. Single-phase magnetite thin films exhibit ferrimagnetic behavior with maximum magnetization of 0.42 T at 1196 kA m-1(15 kOe), which exceeds that of a composite target of ceramic magnetite with Ge chips. Simultaneously adding Ge to the iron-excess wüstite target therefore effectively enhanced magnetization.

Original languageEnglish
Pages (from-to)106-109
Number of pages4
JournalThin Solid Films
Volume520
Issue number1
DOIs
Publication statusPublished - 2011 Oct 31

Keywords

  • Field-cooled magnetization
  • Germanium
  • Magnetite
  • Magnetization loop
  • Sputtering
  • X-ray diffraction
  • Zero field-cooled magnetization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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