Patent ID: 6201663
Filing Date: 2001-03-13
Classification: C03C

Abstract:
A magnetic head having a slider comprising a glass-ceramic substrate which has as its predominant crystal phase a mixed crystal of lithium disilicate (Li2O.2SiO2) and either or both of .alpha.-quartz (.alpha.-SiO2) and .alpha.-cristobalite (.alpha.-SiO2), said .alpha.-quartz having a globular grain structure each globular crystal grain being made of aggregated particles and having a grain diameter within a range from 0.1 .mu.m to 3.0 .mu.m, said .alpha.-cristobalite having a globular grain structure each globular grain having a grain diameter within a range from 0.1 .mu.m to 1.0 .mu.m, and surface roughness (Ra) of said glass-ceramic substrate after polishing being within a range from 5 .ANG. to 50 .ANG..