| 摘要 |
PURPOSE:To stably form an operating gap with narrow width suitable for high recording density, by providing an oxide layer and a joint glass layer by laminating them specified on the gap forming plane of a ferrite core, and heating and pressurizing the gap forming planes after butting them. CONSTITUTION:On the ground gap forming planes of the ferrite cores 101 and 102, aluminum oxide layers 103 and 104 whose respective layer thickness is set at 0.02-0.08mum are provided, and on each of them, silicon oxide layers 105 and 106, and the joint glass layer 107 are provided by laminating them. Next, the gap forming planes on which multiple layer films are provided are heated and pressurized after butting them. Thus, the aluminum oxide layer can prevent the expansion of the gap width by preventing the diffusion of a glass component, and also, relax stress between each layer based on the difference of coefficients of thermal expansion. Therefore, it is possible to form the operating gap with narrow width suitable for the high recording density stably.
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