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Thin film magnetic head with a magnetic gap spacer of a thermally decomposed polymer
| Details |
Inventors: Maruyama, Takao;
Assignee: NEC Corporation (JP)
Primary Examiner: Wolff; John H.
Assistant Examiner:
Attorney, Agent or Firm: Laff, Whitesel, Conte & Saret
A thin film magnetic head comprises a magnetic gap spacer layer interposed between two soft magnetic members at least one of which is formed in a thin film form. The magnetic gap spacer layer is made of a thermally decomposed polymer of a metallic compound represented by the formula, M(OR1)m(R2)n-m, where M is a metallic element selected from metals and metalloids which are elements intermediate in properties between the typical metals and non-metals, R1 being one selected from hydrogen and an alkyle group, R2 being an alkyle group, n being a valence of the metallic element, and m being an integer equal to or less than n. Typical ones of the metallic compound are tetraisopropyl titanate, tetranormalbutyl titanate, tetraalkoxysilane, organosilanol, and aluminum isopropylate. The metallic compound is solved in an organic solvent and is coated on a surface to be formed with the magnetic gap spacer. The coating is heat-treated at a lower temperature to thereby form the polymer. The polymer serves as an adhesive layer for adhering the two magnetic members. |
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DETAILED DESCRIPTION Therefore, an object of this invention is to provide a thin film magnetic head which is easily produced without degradation of the electromagnetic transducing characteristic by using an adhesive material for a gap spacer forming material.
As described above, a thin film magnetic head for magnetically recording and/or reading information on a magnetic recording medium comprises a first magnetic member of a soft magnetic material having a specific surface, a gap spacer layer overlying on and covering the specific surface of the first magnetic member, and a second magnetic member of a soft magnetic thin film, the second magnetic member having an opposite face spaced apart from the specific surface by the gap spacer layer, each of the first and second magnetic members and the gap spacer layer having a side surface facing the magnetic recording medium and lying in the same plane.
A thin film magnetic head according to this invention is characterized in that the gap spacer layer consists essentially of a thermally decomposed polymer of a metallic compound represented by the following formula; M(OR1)m(R2)n-m (1), where M denotes a metallic element selected from metals and metalloids which are elements intermediate in properties between the typical metals and non-metals, R1 indicating one selected from hydrogen and an alkyle group, R2 indicating an alkyle group, n being a valence of the metallic element, and m being an integer equal to or less than n.
In an aspect of this invention, the thin film magnetic head is an inductive type where the first and second magnetic members are connected to each other to form a magnetic headcore.
In another aspect of this invention, the thin film magnetic head is a magnetoresistive type wherein the first magnetic member is a shield plate and the second magnetic member is a magnetoresistive element.
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Metal Working 
