Interparticle Interaction and Magnetic Anisotropy in Metal Evaporated Tape.

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  • Tateno Y.
    Magnetic Media R&D Department Recording Media Company, Sony Corporation

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  • 蒸着テープにおける粒子間相互作用と磁気異方性
  • ジョウチャク テープ ニ オケル リュウシ カン ソウゴ サヨウ ト ジキ イホウセイ

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Interparticle interactions in metal evaporated tape were studied. Due to magnetic interaction fields in the media, two kinds of normalized remanence curves, DC De-magnetization remanence (DCD) and Isothermal Remanent Magnetization (IRM) curves, are not always consistent. In this paper, a new analysis method is considered. The difference between the remanence curves is interpreted as a magnetic interaction field, δH, which is defined as the difference between two kinds of remanence coercivities, Hr and Ha, which are obtained from the DCD and IRM curves, respectively. Parameter δH was confirmed to be useful for evaluating the interparticle interaction in the media. Also, the magnetic anisotropy energy derived from the interparticle interaction, which is estimated from the angular dependence of δH, is useful in discussing the thermal stability of the media’s recorded pattern.

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