摘要 |
A magnetic head having a sputter-deposited glass film of the gap forming area of the magnetic core, said glass film being made of borosilicate glass having the composition consisting of 65-85 mol % of SiO2, 8-30 mol % of B2O3 and containing 2-15 mol % of alkali metal oxide Na2O and K2O and 0.1-5 mol % of Al2O3, with the molar ratio of boron oxide to alkali metal oxides being defined by the following formula: <IMAGE> The magnetic head provides sharpness of the recording leakage flux, thus giving excellent electromagnetic conversion characteristics. |