Abstract
The anisotropic magneto-resistance (MR) ratio and magnetic anisotropy field H k have been examined for (Ni 0.82 Fe 0.18 ) 100-x Co x and Ni 82 Fe 18-x Co x evaporated films, both as-prepared and after annealing at 320°C for two hours, to evaluate their usefulness as MR head materials. The MR ratio of the (Ni 0.82 Fe 0.18 ) 100-x Co x is almost constant regardless of changes in the Co concentration. The MR ratio for the Ni 82 Fe 18-x Co x films increases as the Co concentration increases, and after annealing the MR ratio rises up to 5% in the range of Co concentrations above 6 at%. The H k increases as the Co concentration is increased, and is not changed by annealing. The increase in the MR ratio for Ni 82 Fe 18-x Co x films due to annealing is related to inhomogeneous strain and lattice defects. For Ni 82 Fe 12 Co 6 film, an MR ratio of 5.1% and an H k of 7.0 Oe were obtained, making such film suitable for application in MR heads.
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