Thin-film magnetic head having adjusted magnetostriction
AssigneeAlps Electric Co., Ltd.
InventorTsutomu Takeya
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Abstract
A magnetic head is provided that has a smaller amount of change in asymmetry with respect to the MR height, and has an improved resolution for a reproduction signal. In a magnetic head including a magnetoresistive device as a read device for reading magnetic recording information recorded on a magnetic recording medium, the magnetostriction constant of a soft magnetic substance forming the magnetoresistive device is 0 or below. Since the magnetostriction constant of the magnetoresistive device is 0 or below, the amount of change in asymmetry with respect to the MR height is reduced. Therefore, even when the MR height is slightly changed, the asymmetry does not vary significantly.
Claims12
A magnetic head comprising a magnetoresistive reading device for reproducing a magnetic signal recorded on a magnetic recording medium while contacting said recording medium, said magnetoresistive reading device having a height h in a direction perpendicular to a track width direction of the magnetic recording medium and formed of a soft magnetic substance having a magnetostriction constant of 0 or below, and
- wherein the reproduced magnetic signal is characterized by a negligible asymmetry in its waveform, and said negligible asymmetry does not vary significantly when the magnetoresistive reading device height h is slightly altered.
A magnetic head including two or more magnetoresistive devices as reading devices, for reproducing a magnetic signal recorded on a magnetic recording medium while contacting said recording medium, having each a corresponding height h in a direction perpendicular to a track width direction of the magnetic recording medium and formed of a soft magnetic substance having a magnetostriction constant of 0 or below, and
- wherein the reproduced magnetic signal is characterized by a negligible asymmetry in its waveform, and said negligible asymmetry does not vary significantly when the corresponding magnetoresistive reading devices heights h are slightly altered.
Dependencies are inferred from the claim text.