Reproducing sensitivity of single pole type head with Co-Zr-Nb/SiO2 multilayered films.

Abstract

Effects of domain structures of main pole films on reproducing sensitivities are investigated for single pole type perpendicular magnetic recording heads. The reproducing sensitivity of the single pole head made of a Co-Zr-Nb single layer becomes unstable and decreases with the increase of the closure domain size when the track width narrows and the anisotropy field H_k decreases. On the contrary, for a narrow track main pole made of Co-Zr-Nb multilayered amorphous film with 50 Å thick SiO₂ interlayer, the closure domain cannot be observed clearly. Consequently, the reproducing sensitivity becomes larger than that of the single layer main pole and the reproduced voltage is very stable even for smaller H_k and narrower track.