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Method of fabricating magnetoresistive effect type magnetic head capable of preventing electrostatic damage
| Details |
Inventors: Takeura, Tooru;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Levy; Stuart S.
Assistant Examiner: Watkins; Kevin M.
Attorney, Agent or Firm: Kenyon & Kenyon
A novel magtnetoresistive head unit includes an upper shield film and a lower shield film electrically connected to electrodes connected with an external source which are shorted by a shorting circuit without the intermediary of an MR element. The current due to static electricity generated in the process of element formation is made to flow through the shorting circuit thereby to prevent the electrostatic breakdown of the MR element and the dielectric breakdown between the MR element and the shield films. After cutting out a slider from the substrate, the upper and lower shield films are shorted by the shorting circuit, thereby preventing the electrostatic breakdown of the magnetoresistive element and the dielectric breakdown between the magnetoresistive element and the shield films during the assembly and transportation. The electrostatic breakdown is also prevented in the processes from the formation of the magnetoresistive (MR) element to the mounting of the MR element on the apparatus, thereby making it possible to fabricate an MR head and a write-read separated magnetic head with a high yield. |
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DETAILED DESCRIPTION An object of the present invention is to eliminate the above-mentioned problems of the prior art and to provide a magnetoresistive head and a method of fabricating the same capable of preventing the electrostatic breakdown of the magnetoresistive element or the like also during the fabrication and transportation.
Another object of the invention is to provide a magnetoresistive head unit and a method of fabricating the same with high yield while preventing the electrostatic breakdown in the process before mounting on the magnetic disk apparatus or the like.
In order to achieve the above-mentioned objects, according to a first aspect of the present invention, there is provided a magnetoresistive head comprising a magnetoresistive element including a magnetoresistive film and a bias film, a pair of electrodes for detecting the resistance change of the magnetoresistive element due to the change of an external magnetic field, an upper shield film and a lower shield film for holding the magnetoresistive element and the two electrodes therebetween, and a shorting circuit for shorting the two electrodes without the intermediary of the magnetoresistive element.
According to a second aspect of the invention, there is provided a magnetoresistive magnetic head comprising a magnetoresistive element including a magnetoresistive film and a bias film, a pair of electrodes for detecting the resistance change of the magnetoresistive element due to the change of an external magnetic field, an upper shield film and a lower shield film for holding the magnetoresistive element and the two electrodes therebetween, and a shorting circuit for electrically shorting the upper shield film and the lower shield film without the intermediary of the magnetoresistive element, wherein one of the electrodes is electrically connected to the upper shield film, and the other electrode is electrically connected to the lower shield film.
According to a third aspect of the invention, there is provided a magnetoresistive head having the features of the first and second aspects described above, wherein the resistance value of the shorting circuit is not more than one tenth that of the magnetoresistive element
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Metal Working 
