Abstract
A new single-poly-type head with a single-turn thin-film coil is presented. A main pole was laid between two conductive layers of coils to reduce the leakage of magnetic flux from the main pole by means of the eddy current induced in the coils. A ferrite return path core, placed under the lower coil, brought a high read/write sensitivity by shortening the magnetic path in the head. Although only a single-turn coil was used, employment of this scheme with a Co-Cr/Fe-Ni-Nb double-layered medium at a writing current of 50 rnA (0.05 ATo-p) led to saturation of the medium. A high normalized output of 1000 nVp-p/μm·turn·m/s was obtained. The recording and reproducing sensitivity was much higher than that of our conventional inductive single-pole head.
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