Tdk Corporation

Ken Fujii

Nobuyuki Kobayashi

Hisayoshi Watanabe

Hitoshi Hatate

Masachika Hashino

Tatsuhiro Nojima

Shuji Okame

Takayuki Nishizawa

Atsuyoshi Tsunoda

Makoto Fukui

A magnetoresistive device includes an MR element including a metal layer, and an insulating portion made of magnesium oxide and in contact with the MR element. A method of manufacturing the magnetoresistive device includes the step of removing an unwanted magnesium oxide film that is formed by the magnesium oxide in the process of forming the insulating portion. In this step, the unwanted magnesium oxide film is wet etched by using an etchant containing an aqueous ammonia solution.

Method of etching a magnesium oxide film

A method for manufacturing a pattern multilayer body that has a plurality of pattern layers, and where a pattern is formed in each pattern layer, includes a step of forming an overlay pattern within an overlay pattern formation region, and in the step of forming the overlay pattern, a photoresist film is formed, and after a photoresist film is exposed via a main mask, a resist pattern is formed by exposing a sub mask(s). The main mask has a pattern light-shielding part that is commonly used for forming a pattern in each pattern layer, and each main light-shielding part for forming each overlay pattern; and a sub mask has an opening part that is exposable to an unexposed region(s) within an overlay pattern formation region other than an unexposed region(s) on the photoresist film, which has been light-shielded by the main light-shielding part for forming a corresponding overlay pattern.

Manufacturing method for pattern multilayer body and mask set

Method for manufacturing a magnetic head includes providing a stopper layer on an upper surface of a main magnetic pole layer applying a magnetic flux to a recording medium via a first insulation layer, providing a second insulation layer on the upper surface of the first insulation layer to cover at least an entire surface of the stopper layer, covering an upper surface portion of the second insulation layer with a mask layer, forming a height difference portion by removing at least a first insulation layer portion not covered by the mask layer by etching to at least partially remove at least a stopper layer portion in a film thickness direction, and subsequently by removing the mask layer, forming a electrode film in the height difference portion, and forming a plating film, which is a magnetic shield for the main magnetic pole layer, on an upper surface of the electrode.

Manufacturing method of magnet head able to reduce electrode film for plating

There is provided a digital recording and reproducing apparatus which is capable of determining whether or not recording data was rewritten, reliably and in a short time period without increasing manufacturing costs thereof. A digital recording and reproducing apparatus is configured to be capable of having a removable external memory mounted therein, for recording recording data in the external memory and reproducing a sound based on the recording data recorded in the external memory. An identification data-generating block generates identification data for use in determining whether or not the recording data was rewritten. An internal memory can record the identification data. A control block records the identification data in the external memory as part of the recording data and at the same time records the identification data in the internal memory such that the identification data is recorded in FAT data concerning the recording data in a manner correlated to a title of a file to be recorded therein. When the control block reads in the recording data from the external memory, if the identification data corresponding to the title of the file in the FAT data concerning the recording data read in from the external memory exists in the internal memory, the control block compares the existing identification data and the identification data recorded in the recording data read in with each other, and carries out predetermined processing if the compared identification data are different from each other.

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Tokyo, Japan

Ken Fujii