A Study on Glass-bonding for Magnetic Recording Head Ferrite Core

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Abstract
A narrow gap of the ferrite core is formed by pouring molten glass. Mutually diffused elements distribution of the glass and ferrite during forming were estimated by XMA and the relations between diffusion depth and bonding conditions were clarified. Also, the reluctance of the diffusion layer was investigated. The glass flow depth into the narrow gap was investigated under the temperature c onditions without diffusion. The results obtained are as follow. (1) The glass elements diffusion is dominated at the Mn-Zn ferrite grain boundaries. Under working temperature condition, no diffusion at interface is detected by XMA. (2) The reluctance of the diffusion layer can be estimated by the following method. A core with a diffusion layer in the magnetic path is made. Core reluctance is measured by vector-impedance meter in steps every time when the diffusion layer is polished off little by little. At the diffusion layer nearest the matrix ferrite, permeability is decreased to 10-2 times the original value. (3) Equation of motion for conventional viscous fluid can be applied for glass flow characteristics.

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