| 摘要 |
A magnetic head has a slider made of a glass-ceramic substrate which has, as its predominant crystal phase, a mixed crystal of lithium disilicate (Li<SMALLCAPS>2</SMALLCAPS>O.2SiO<SMALLCAPS>2</SMALLCAPS>) and either or both of alpha-quartz (alpha-SiO<SMALLCAPS>2</SMALLCAPS>) and alpha-cristobalite (alpha-SiO<SMALLCAPS>2</SMALLCAPS>), the alpha-quartz has a globular grain structure each globular crystal grain being made of aggregated particles and having a grain diameter within a range from 0.1 mum to 3.0 mum, the alpha-cristobalite has a globular grain structure each globular grain having a grain diamter within a range from 0.1 mum to 1.0 mum, and surface roughness (Ra) of the glass-ceramic substrate after polishing is within a range from 5 Å to 50 Å.
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