发明名称 |
Magnetic head having first and second protective films with different coefficients of linear expansion |
摘要 |
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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申请公布号 |
US7460335(B2) |
申请公布日期 |
2008.12.02 |
申请号 |
US20060415572 |
申请日期 |
2006.05.01 |
申请人 |
HITACHI GLOBAL TECHNOLOGIES JAPAN, LTD. |
发明人 |
MARUYAMA YOHJI;IWAKURA TADAYUKI;KAWABE TAKASHI;MORIJIRI MAKOTO;FUKUI HIROSHI |
分类号 |
G11B5/31;G11B5/60;G11B5/39 |
主分类号 |
G11B5/31 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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