Patents by Inventor Tatsuhiro Nojima
Tatsuhiro Nojima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 9087529Abstract: 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.Type: GrantFiled: March 18, 2013Date of Patent: July 21, 2015Assignee: TDK CorporationInventors: Tatsuhiro Nojima, Ken Fujii
-
Patent number: 8654479Abstract: A thin film magnetic recording head having a multilayer structure in which plural thin films are laminated and being a perpendicular recording type that applies a magnetic field perpendicularly to a magnetic recording medium and performs recording, includes a main magnetic pole exposed on an air bearing surface facing the magnetic recording medium and guiding a magnetic flux toward the magnetic recording medium, a thin film positioned beneath the main magnetic pole from a perspective of a lamination direction and configuring a sensor or a heater configured to determine a distance from the magnetic recording medium of the thin film magnetic recording head, and a light-absorbing portion positioned between the main magnetic pole and the thin film.Type: GrantFiled: June 28, 2012Date of Patent: February 18, 2014Assignee: TDK CorporationInventors: Masashi Sano, Hiromichi Umehara, Mutsumi Fujita, Isamu Toba, Tatsuhiro Nojima, Hitoshi Hatate, Hisayoshi Watanabe
-
Publication number: 20140002921Abstract: A thin film magnetic recording head having a multilayer structure in which plural thin films are laminated and being a perpendicular recording type that applies a magnetic field perpendicularly to a magnetic recording medium and performs recording, includes a main magnetic pole exposed on an air bearing surface facing the magnetic recording medium and guiding a magnetic flux toward the magnetic recording medium, a thin film positioned beneath the main magnetic pole from a perspective of a lamination direction and configuring a sensor or a heater configured to determine a distance from the magnetic recording medium of the thin film magnetic recording head, and a light-absorbing portion positioned between the main magnetic pole and the thin film.Type: ApplicationFiled: June 28, 2012Publication date: January 2, 2014Applicant: TDK CorporationInventors: Masashi SANO, Hiromichi Umehara, Mutsumi Fujita, Isamu Toba, Tatsuhiro Nojima, Hitoshi Hatate, Hisayoshi Watanabe
-
Patent number: 8559133Abstract: A perpendicular magnetic write head includes: a magnetic pole having an end face on an air bearing surface; and side shield layers each having an end face on the air bearing surface, and arranged on both sides, in a write track width direction, of the magnetic pole with a side gap in between. The end face of the magnetic pole has a geometry in which a width at a trailing edge is larger than a width at a leading edge. Relationship D1<D2, D1<D3, and D3?D2 are satisfied in the air bearing surface, where D1 is a gap length of the side gap at the trailing edge, D2 is a gap length of the side gap at the leading edge, and D3 is a gap length of the side gap at any position between the trailing edge and the leading edge.Type: GrantFiled: June 1, 2009Date of Patent: October 15, 2013Assignee: TDK CorporationInventors: Kei Hirata, Takeo Kagami, Tatsuhiro Nojima, Hisayoshi Watanabe, Michitaka Nishiyama
-
Patent number: 8472137Abstract: The present invention relates to a magnetic head, a manufacturing method therefor, a head assembly, and a magnetic recording/reproducing apparatus. According to the present invention, it includes a magnetic pole layer, a non-magnetic layer, a trailing gap layer, and a trailing shield layer. The magnetic pole layer has a pole tip exposed on a magnetic medium-facing surface. The non-magnetic layer is laid on the magnetic pole layer. The trailing shield layer is exposed on the magnetic medium-facing surface and laid over the magnetic pole layer and the non-magnetic layer with the trailing gap layer between. The magnetic pole layer and the non-magnetic layer have a continuous tapered face opposed to a lower side of the trailing shield layer. Moreover, the tapered face extends from a trailing edge of the pole tip at a constant inclination angle.Type: GrantFiled: July 28, 2010Date of Patent: June 25, 2013Assignee: TDK CorporationInventors: Kei Hirata, Kenkichi Anagawa, Michitaka Nishiyama, Hideyuki Yatsu, Shin Narushima, Hisayoshi Watanabe, Tatsuhiro Nojima
-
Patent number: 8373947Abstract: A magnetic head slider includes a magnetic recording part and/or a reproducing part. The magnetic head slider includes a resistance film having temperature dependence of electrical resistance, the resistance film being positioned in the vicinity of an air bearing surface or on the air bearing surface, separately from the magnetic recording part and the reproducing part. The magnetic head slider further includes a first protective film with a smaller milling rate than the resistance film, the first protective film contacting a lower surface of the resistance film in a lamination direction of the magnetic head slider and on the air bearing surface, and/or a second protective film with a smaller milling rate than the resistance film, the second protective film contacting an upper surface of the resistance film in the lamination direction of the magnetic head slider and on the air bearing surface.Type: GrantFiled: September 29, 2011Date of Patent: February 12, 2013Assignee: TDK CorporationInventors: Tatsuhiro Nojima, Masashi Sano, Yosuke Antoku, Mutsumi Fujita, Isamu Toba, Norio Takahashi, Hideyuki Ukita
-
Perpendicular magnetic head and magnetic recording system having non-magnetic region in shield layer
Patent number: 8305709Abstract: A perpendicular magnetic head for writing information on a magnetic recording medium comprises an ABS, a coil for generating a magnetic flux, a magnetic pole layer, a magnetic shield layer, and a gap layer disposed between the magnetic pole layer and the magnetic shield layer. Further the magnetic head has a non-magnetic region of a non-magnetic material. The non-magnetic region is disposed in the magnetic shield layer and positioned behind the ABS at a predetermined distance. The non-magnetic region is also disposed in the magnetic shield layer and has a predetermined width. With such a configuration, an undesirable concentration of the magnetic flux on the ABS is prevented.Type: GrantFiled: August 8, 2008Date of Patent: November 6, 2012Assignee: TDK CorporationInventors: Norikazu Ota, Tatsuhiro Nojima, Tsuyoshi Umehara -
Patent number: 8282843Abstract: A method of manufacturing a perpendicular magnetic head having a writing element that writes magnetic information to a recording medium includes forming a main magnetic pole part generating a magnetic field on a substrate; removing at least a part of the substrate and a material existing at a circumference of the main magnetic pole part to expose an entire circumference of the main magnetic pole part at a surface that becomes an opposing medium surface (ABS) opposite to the recording medium; forming a shield gap film that is made of a nonmagnetic material so as to cover the entire circumference of the main magnetic pole part at least at the surface that becomes the ABS; and forming a shield layer so as to cover an entire circumference of the shield gap film at least at the surface that becomes the ABS.Type: GrantFiled: November 10, 2009Date of Patent: October 9, 2012Assignee: TDK CorporationInventors: Tatsuhiro Nojima, Hisayoshi Watanabe, Masachika Hashino
-
Patent number: 8117737Abstract: A manufacturing method for a magnetic head includes the steps of: forming a structure on a lower shield, the structure including a lower gap, a main magnetic pole and first and second side gaps; forming first and second side shields; forming an upper gap; and forming an upper shield. In the step of forming the structure, an initial lower gap layer is formed on the lower shield, the initial lower gap layer including a pre-lower-gap portion, and two to-be-removed portions that are located on opposite sides of the pre-lower-gap portion. Then, a protrusion including the main magnetic pole and the first and second side gaps is formed on the pre-lower-gap portion. With the top surface of the protrusion covered with a mask, the initial lower gap layer is etched in part to thereby form the lower gap.Type: GrantFiled: November 30, 2009Date of Patent: February 21, 2012Assignee: TDK CorporationInventors: Hisayoshi Watanabe, Masachika Hashino, Michitoshi Tsuchiya, Koichi Otani, Tatsuhiro Nojima, Tsutomu Nishinaga, Hideyuki Ukita
-
Publication number: 20120026629Abstract: The present invention relates to a magnetic head, a manufacturing method therefor, a head assembly, and a magnetic recording/reproducing apparatus. According to the present invention, it includes a magnetic pole layer, a non-magnetic layer, a trailing gap layer, and a trailing shield layer. The magnetic pole layer has a pole tip exposed on a magnetic medium-facing surface. The non-magnetic layer is laid on the magnetic pole layer. The trailing shield layer is exposed on the magnetic medium-facing surface and laid over the magnetic pole layer and the non-magnetic layer with the trailing gap layer between. The magnetic pole layer and the non-magnetic layer have a continuous tapered face opposed to a lower side of the trailing shield layer. Moreover, the tapered face extends from a trailing edge of the pole tip at a constant inclination angle.Type: ApplicationFiled: July 28, 2010Publication date: February 2, 2012Applicant: TDK CORPORATIONInventors: Kei HIRATA, Kenkichi Anagawa, Michitaka Nishiyama, Hideyuki Yatsu, Shin Narushima, Hisayoshi Watanabe, Tatsuhiro Nojima
-
Patent number: 8102622Abstract: In a perpendicular magnetic write head manufacturing method a magnetic layer is formed on a substrate. On the magnetic layer, first and second nonmagnetic layers are formed with different materials. A mask pattern is formed on the second nonmagnetic layer, and the second nonmagnetic layer in a region not covered with the mask pattern is removed. Thereby, the patterned second nonmagnetic layer is formed while leaving the first nonmagnetic layer. The mask pattern is removed and a milling process is selectively performed on the first nonmagnetic layer and the magnetic layer with the patterned second nonmagnetic layer as a mask to remove all of the first nonmagnetic layer in an exposed region and to dig down the magnetic layer in the exposed region, thereby forming a main magnetic pole layer having an inclined part whose thickness decreases with distance from an edge position of the patterned second nonmagnetic layer.Type: GrantFiled: January 5, 2009Date of Patent: January 24, 2012Assignee: TDK CorporationInventors: Atsushi Yamaguchi, Michitaka Nishiyama, Shin Narushima, Hiromichi Umehara, Makoto Sato, Tatsuhiro Nojima
-
Publication number: 20110127234Abstract: A manufacturing method for a magnetic head includes the steps of; forming a structure on a lower shield, the structure including a lower gap, a main magnetic pole and first and second side gaps; forming first and second side shields; forming an upper gap; and forming an upper shield. In the step of forming the structure, an initial lower gap layer is formed on the lower shield, the initial lower gap layer including a pre-lower-gap portion, and two to-be-removed portions that are located on opposite sides of the pre-lower-gap portion. Then, a protrusion including the main magnetic pole and the first and second side gaps is formed on the pre-lower-gap portion. With the top surface of the protrusion covered with a mask, the initial lower gap layer is etched in part to thereby form the lower gap.Type: ApplicationFiled: November 30, 2009Publication date: June 2, 2011Applicant: TDK CORPORATIONInventors: Hisayoshi Watanabe, Masachika Hashino, Michitoshi Tsuchiya, Koichi Otani, Tatsuhiro Nojima, Tsutomu Nishinaga, Hideyuki Ukita
-
Publication number: 20110108520Abstract: A method of manufacturing a perpendicular magnetic head having a writing element that writes magnetic information to a recording medium includes forming a main magnetic pole part generating a magnetic field on a substrate; removing at least a part of the substrate and a material existing at a circumference of the main magnetic pole part to expose an entire circumference of the main magnetic pole part at a surface that becomes an opposing medium surface (ABS) opposite to the recording medium; forming a shield gap film that is made of a nonmagnetic material so as to cover the entire circumference of the main magnetic pole part at least at the surface that becomes the ABS; and forming a shield layer so as to cover an entire circumference of the shield gap film at least at the surface that becomes the ABS.Type: ApplicationFiled: November 10, 2009Publication date: May 12, 2011Applicant: TDK CORPORATIONInventors: Tatsuhiro Nojima, Hisayoshi Watanabe, Masachika Hashino
-
Publication number: 20100302680Abstract: A perpendicular magnetic write head includes: a magnetic pole having an end face on an air bearing surface; and side shield layers each having an end face on the air bearing surface, and arranged on both sides, in a write track width direction, of the magnetic pole with a side gap in between. The end face of the magnetic pole has a geometry in which a width at a trailing edge is larger than a width at a leading edge. Relationship D1<D2, D1<D3, and D3?D2 are satisfied in the air bearing surface, where D1 is a gap length of the side gap at the trailing edge, D2 is a gap length of the side gap at the leading edge, and D3 is a gap length of the side gap at any position between the trailing edge and the leading edge.Type: ApplicationFiled: June 1, 2009Publication date: December 2, 2010Applicant: TDK CORPORATIONInventors: Kei Hirata, Takeo Kagami, Tatsuhiro Nojima, Hisayoshi Watanabe, Michitaka Nishiyama
-
Publication number: 20100172054Abstract: In a perpendicular magnetic write head manufacturing method a magnetic layer is formed on a substrate. On the magnetic layer, first and second nonmagnetic layers are formed with different materials. A mask pattern is formed on the second nonmagnetic layer, and the second nonmagnetic layer in a region not covered with the mask pattern is removed Thereby, the patterned second nonmagnetic layer is formed while leaving the first nonmagnetic layer. The mask pattern is removed and a milling process is selectively performed on the first nonmagnetic layer and the magnetic layer with the patterned second nonmagnetic layer as a mask to remove all of the first nonmagnetic layer in an exposed region and to dig down the magnetic layer in the exposed region, thereby forming a main magnetic pole layer having an inclined part whose thickness decreases with distance from an edge position of the patterned second nonmagnetic layer.Type: ApplicationFiled: January 5, 2009Publication date: July 8, 2010Applicant: TDK CORPORATIONInventors: Atsushi Yamaguchi, Michitaka Nishiyama, Shin Narushima, Hiromichi Umehara, Makoto Sato, Tatsuhiro Nojima
-
Publication number: 20100033879Abstract: A perpendicular magnetic head for writing information on a magnetic recording medium comprises an ABS, a coil for generating a magnetic flux, a magnetic pole layer, a magnetic shield layer, and a gap layer disposed between the magnetic pole layer and the magnetic shield layer. Further the magnetic head has a non-magnetic region of a non-magnetic material. The non-magnetic region is disposed in the magnetic shield layer and positioned behind the ABS at a predetermined distance. The non-magnetic region is also disposed in the magnetic shield layer and has a predetermined width. With such a configuration, an undesirable concentration of the magnetic flux on the ABS is prevented.Type: ApplicationFiled: August 8, 2008Publication date: February 11, 2010Applicant: TDK CORPORATIONInventors: Norikazu OTA, Tatsuhiro NOJIMA, Tsuyoshi UMEHARA