Soft Magnetic Materials with B_s = 2.4 T for a High-Performance Writer

概要

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To realize higher areal density in hard disk drives (HDDs), it is necessary to develop soft magnetic materials with high saturation magnetic flux density (B_s) as pole tip materials for write heads. We have developed soft magnetic FeCoAIO films with a B_s of 〜2.4 T, which is close to the limit of B_s in thermal equilibrium ferromagnetic alloys. Uniaxial anisotropy is obtained in the as-made films without an applied field during sputtering. The films have sufficient magnetic thermal stability and corrosion resistance to withstand magnetic head fabrication processes. For write heads with pole tips composed of FeCoAIO films, the overwrite (O/W) is about -45 dB. Accordingly, it is established that ultrahigh B_s FeCoAIO films are effective for improving write performance.
社団法人日本磁気学会の論文
2003-03-01