Laminated hard disk head for high density magnetic recording

Hard disk heads with a novel core structure have been developed for high-density magnetic recording by using magnetic alloy thin films as a core material. Sendust alloy films have been sandwiched between two nonmagnetic substrates for the sliders. This structure brings about good manufacturability, low head inductance, and good off-track characteristics. Read/write characteristics were evaluated for the structured heads with various narrow track widths. The laminated head inductance is about 40% of that for a metal-in-gap head. Normalized output voltage is 167 nVp-p/μμ-turn-m/sec. D₇₀ recording density is 47 KFCI. At 17.5 KFCI, the difference between effective track width and optical track width is 1.4 μm. Thus, the laminated head shows great potential for achieving high-areal-density recording