Cobalt-titanium substituted barium ferrite films for magneto-optical memory

DOI PDF 被引用文献6件
  • H. Nakamura
    Research and Development Center, Ricoh Company, Ltd., 4686 Nippa-cho, Kohoku-ku, Yokohama 223, Japan
  • F. Ohmi
    Research and Development Center, Ricoh Company, Ltd., 4686 Nippa-cho, Kohoku-ku, Yokohama 223, Japan
  • Y. Kaneko
    Research and Development Center, Ricoh Company, Ltd., 4686 Nippa-cho, Kohoku-ku, Yokohama 223, Japan
  • Y. Sawada
    Research and Development Center, Ricoh Company, Ltd., 4686 Nippa-cho, Kohoku-ku, Yokohama 223, Japan
  • A. Watada
    Research and Development Center, Ricoh Company, Ltd., 4686 Nippa-cho, Kohoku-ku, Yokohama 223, Japan
  • H. Machida
    Research and Development Center, Ricoh Company, Ltd., 4686 Nippa-cho, Kohoku-ku, Yokohama 223, Japan

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<jats:p>We have studied Faraday rotation and magnetic properties of Co-Ti substituted barium ferrite films with perpendicular anisotropy, which were prepared by targets-facing-type sputtering method on (111) oriented GGG substrates. Faraday rotation (θF) of 500–830 nm was measured by using the Faraday modulation method. It was found that θF increased proportionally to the content of cobalt in the wavelength range 700–830 nm. In the BaFe10.42Co0.78Ti0.8O19 film, Faraday rotation and magnetic properties were as follows: θF=0.75 deg/μm at 780 nm, anisotropy field: Hk=5.2 kOe, coercive force: Hc=800 Oe, Curie temperature: TC=380 °C. Thermomagnetic recording was achieved on this film by using a 780-nm laser diode. As a result, 2.0-μm bit patterns were observed by Faraday effect.</jats:p>

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