Development of half-metallic ultra-thin Fe 3 O 4 film for new spin-transport devices

H. Takahashi, S. Soeya, J. Hayakawa, H. Hoshiya, Kenchi Ito, C. Yamamoto, A. Kida, H. Asano, M. Matsui

Research output: Chapter in Book/Report/Conference proceedingConference contribution


TMR, GMR and MRAM devices are currently active areas of research. The MR ratio is related to the spin polarization (P) of electrons in the ferromagnetic electrodes. The most attractive materials for high P are the so-called half-metallic ferromagnets. The application requires a high Curie temperature (T C ), so this limits the half-metallic material to Fe 3 O 4 (T C =858 K). To apply the Fe 3 O 4 film to devices, a low-temperature preparation and thinning technique are required. We fabricated a high-quality Fe 3 O 4 film while satisfying both the low-thermal preparation and film thinness requirements. This maybe the first successful report of obtaining a high-quality Fe 3 C 4 film under the crucial conditions of low substrate temperature (523 K) with an ultrathin film thickness (100 Å). The film was deposited onto a MgO[100] substrate using rf-sputtering. The saturation magnetization was measured using a VSM. The crystallographic microstructure was analyzed using XRD. The resistivity and Verwey point (T v ) were measured by a standard four terminal method.

Original languageEnglish
Title of host publicationINTERMAG Europe 2002 - IEEE International Magnetics Conference
EditorsJ. Fidler, B. Hillebrands, C. Ross, D. Weller, L. Folks, E. Hill, M. Vazquez Villalabeitia, J. A. Bain, Jo De Boeck, R. Wood
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)0780373650, 9780780373655
Publication statusPublished - 2002 Jan 1
Event2002 IEEE International Magnetics Conference, INTERMAG Europe 2002 - Amsterdam, Netherlands
Duration: 2002 Apr 282002 May 2

Publication series

NameINTERMAG Europe 2002 - IEEE International Magnetics Conference


Other2002 IEEE International Magnetics Conference, INTERMAG Europe 2002

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering
  • Surfaces, Coatings and Films

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