Flattop-Type Writer Using Soft Magnetic Films with High Resistivity

概要

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To improve write performance at high frequency, a flattop-type head consisting of a flat upper yoke and sputtered soft magnetic films is proposed. The sputtered FeCoAIO films used as yoke materials are magnetically soft, and have a resistivity ρ of〜 100 μΩcm, a saturation magnetic flux density B_s of 〜 1.8 T, and an anisotropy field H_k of〜 25 Oe. All of these values for the FeAIO films are higher than those of conventional plated NiFe yoke materials. The yoke thickness and length are 2 μm and 18 μm, respectively. A flattop-type head containing an FeAIO yoke at a high writing frequency of more than 540 Mfrps has an O/W of around -30 dB and shows good NLTS (≦ 15%). Consequently, the improvement of the write performance at high frequency is confirmed when plated 45-50 NiFe films are replaced by sputtered FeAIO films as yoke materials.
社団法人日本磁気学会の論文
2003-03-01