ハードディスク用 MR ヘッドの電磁変換特性

抄録

A disk-drive head combining a shunt biased MR read element and a multi-turn inductive write element is designed for a 2.5″ hard disk drive and was used for these expriments. The MR element, which consists of Ni-Fe film, exists in the inductive write gap. The write core consists of Mn-Zn ferrite and Co-Zr-Nb-Ta amorphous film. It has a Shaped Rail Air Bearing Surface to obtain high reliability at low flying height, such as 0.15μm. Output of 0.54 mV_p-p in longitudinal recording and 0.35 mV_p-p in perpendicular recording were obtained for the MR-inductive combination head at 4.7 m/s media velocity, 0.15μm flying height and 10.0μm track width. Moreover, in spite of the fact that the MR element did not have center tap, it could decrease second harmonic distortion under -26 dB.