Magnetic head having first and second protective films with...

Dynamic magnetic information storage or retrieval – Fluid bearing head support – Disk record

Reexamination Certificate

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C360S236500

Reexamination Certificate

active

07460335

ABSTRACT:
A magnetic head comprises a retrieving unit for converting magnetic information output from a recording medium into an electric signal, a writing unit having the function of electromagnetic conversion for writing the magnetic information in the recording medium in response to the electric signal, and a first protective film formed on the retrieving unit. A second protective film is formed on the first protective film. The coefficient of linear expansion of the second protective film is reduced in comparison with that of the first protective film. Furthermore, the first protective film is an alumina film; in contrast, the second protective film is a film made of an alumina film containing silicon oxide therein.

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Japan Patent Office (JPO) office action dated Feb. 19, 2008 for JPO application JP2002-355786.

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