単磁極ヘッド用Fe-Co膜及びFe-Co/Ni-Cr多層膜の磁気特性

概要

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We investigated Fe_<70>Co_<30> soft magnetic films and [Fe_<70>Co<30>/Ni_<80>Cr_<20>]_n multilayered films with Ni_<80>Cr_<20> underlayers for use in single-pole-tip (SPT) head applications. Fe-Co films with a NrCr underlayer show a low hard-axis coercivity (H_<ch>) of 6 Oe. The NrCr underlayer decreases the crystal grain size of Fe-Co film from 30 to 15 nm. The [Fe-Co/Ni-Cr] multilayered films with a Ni-Cr underlayer showed a large Hch of 30 Oe and large remanent flux density OR) of 2.3 T. Annealing the films in a magnetic field caused improvements of H-h to 2 Oe and of Bt to less than 0.2 T. X-ray diffraction results showed that reduction of crystal strain causes the improvement of these magnetic properties. We also fabricated SPT heads multilayered Fe-Co/Ni-Cr films. In comparison with the single-layer-pole head, the multilayered-pole head showed good suppression of pole-induced erasure both by improved soft magnetic properties and by stabilizing the domain structure with magnetostatic coupling at the pole edge.
社団法人日本磁気学会の論文
2004-12-01