High-performance write head design and materials

Ikuya Tagawa, Shoji Ikeda, Yuji Uehara

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The rapid increase in areal recording density means that a stronger writing field without side erasure is required. However, the increase in the data transfer rate makes write head optimization difficult. Moreover, it has become very important to minimize the write pole size tolerance because of the reduction in write track width. We have designed a new head throat shape with a deep gap depth that is formed with SiO2 thin film. Our head has an advantage in gap depth tolerance as well as in write track width tolerance. We also developed soft magnetic FeCoAlO films with a saturation magnetic flux density (Bs) of 2.4 T for improving the overwrite (O/W) performance without worsening the side erasure characteristics. It was found that the O/W becomes less than -30 dB when the writing field is larger than the dynamic coercivity HcO of the medium. The side erasure was characterized by investigating the maximum tolerance field against di-bit signal degradation on the adjoining track.

Original languageEnglish
Pages (from-to)164-173
Number of pages10
JournalFujitsu Scientific and Technical Journal
Issue number2
Publication statusPublished - 2001 Dec


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