Patents by Inventor Moriaki Fuyama
Moriaki Fuyama 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).
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Patent number: 7333301Abstract: A thin-film magnetic head having little temperature rise in the element, good heat dissipation and a short magnetic path length (narrow coil pitch) and manufacturing method for same is provided. To form the coil of the thin-film magnetic head, a lower coil is first formed and after forming alumina and an inorganic compound containing alumina, a trench is formed for the upper coil by reactive ion etching. The lower coil allows uniform etching at this time and functions as a film to prevent loading effects occurring during reactive ion etching. This trench is then plated in copper and chemical mechanical planarization performed to form the upper layer coil as the dual-layer coil of the present invention. Heat from the coil is efficiently radiated towards the substrate by alumina and an inorganic compound containing alumina with good heat propagation.Type: GrantFiled: August 29, 2003Date of Patent: February 19, 2008Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Kimitoshi Etoh, Nobuo Yoshida, Moriaki Fuyama, Makoto Morijiri, Kenichi Meguro, Ichiro Oodake, Kazue Kudo, Yohji Maruyama, Katsuro Watanabe
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Patent number: 7310203Abstract: There is provided a thin film magnetic head, with letting a distance of a portion, where a width of a track portion in an upper magnetic pole changes, from a flying plane from a medium be Ly, and letting a distance of a portion, where a distance between right and left of a surface portion in a lower magnetic pole in a track width direction is wider than the width of the upper magnetic pole in the track width direction, from the flying plane from a medium be Tp, by creating a thin film magnetic head that is equipped with a recording head that has a relation of Tp?Ly, it becomes possible to reduce a needless leakage magnetic field in the track width direction with securing magnetic field strength.Type: GrantFiled: September 10, 2002Date of Patent: December 18, 2007Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Nobuo Yoshida, Ichiro Oodake, Moriaki Fuyama, Kazue Kudo, Kimitoshi Etoh, Shigekazu Ohtomo, Hiroshi Fukui
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Publication number: 20070153418Abstract: Disclosed are a thin-film magnetic recording head suitable for high density recording and its fabrication method elaborated to avoid corrosion of the main pole section of the head. A non-magnetic metal layer is formed on the top of the main pole.Type: ApplicationFiled: March 6, 2007Publication date: July 5, 2007Inventors: Hisashi Kimura, Moriaki Fuyama
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Patent number: 7203032Abstract: Disclosed are a thin-film magnetic recording head suitable for high density recording and its fabrication method elaborated to avoid corrosion of the main pole section of the head. A non-magnetic metal layer is formed on the top of the main pole.Type: GrantFiled: October 30, 2003Date of Patent: April 10, 2007Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Hisashi Kimura, Moriaki Fuyama
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Patent number: 7150819Abstract: A material for magnetic pole for attaining a writing head generating an intense recording magnetic field, and a structure and a manufacturing method therefor. The thin film magnetic head includes a magnetic pole layer having a plated magnetic layer containing Co, Ni and Fe formed on a plated underlayer of a sputtered magnetic layer containing Co, Ni and Fe. The CoNiFe magnetic layer having a composition: 40 wt %?Co?70 wt %, 10 wt %?Ni?25 wt % and 10 wt %?Fe?30 wt % and a peak intensity ratio in the X-ray diffraction of I(200)/I(111)?0.5 and I(110)/I(111)?1 (defining peak intensities for the face-centered cubic fcc (111) face, fcc (200) face and the body-centered cubic bcc (119) face as: I(111), I(200), I(110)).Type: GrantFiled: March 9, 2004Date of Patent: December 19, 2006Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Kazue Kudo, Yasuyuki Okada, Nobuo Yoshida, Moriaki Fuyama, Noriyuki Saiki, Gen Oikawa, Takashi Kawabe, Makoto Morijiri
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Patent number: 7142391Abstract: A lower magnetic pole front end portion is provided on a lower magnetic pole main layer, and then, an upper magnetic pole front end portion or an upper magnetic pole front end layer is formed on the flat surface so as to enhance the track width accuracy of thin film head. The height of the lower magnetic pole front end portion is increased so as to enhance the magnetic field intensity. A projection step portion having a width larger than that of the upper magnetic pole front end layer is provided on the lower magnetic pole front end portion. The unnecessary medium in-plane magnetic field can be thus reduced in the off-track position. The respective parts of the head are corrected, thereby realizing a high recording magnetic field intensity exceeding 716 kA/m (9000Oe).Type: GrantFiled: August 31, 2001Date of Patent: November 28, 2006Assignee: Hitachi Global Storage Tehcnologies Japan, Ltd.Inventors: Shigekazu Ohtomo, Moriaki Fuyama, Nobuo Yoshida, Hiroshi Fukui
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Patent number: 7142392Abstract: A thin film head having reading part and recording part having an upper magnetic pole front end layer and a lower magnetic pole having a lower magnetic main layer, a lower magnetic pole front end portion on the lower magnetic main layer, and a projection step portion on the lower magnetic pole front end portion. The upper magnetic pole front end layer has a magnetic pole expansion position and a length from an air bearing surface to the magnetic pole expansion position is less than a length from the air bearing surface to gap depth position of the lower magnetic pole front end portion.Type: GrantFiled: December 3, 2004Date of Patent: November 28, 2006Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Shigekazu Ohtomo, Moriaki Fuyama, Nobuo Yoshida, Hiroshi Fukui
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Publication number: 20050078412Abstract: A thin film head having reading part and recording part having an upper magnetic pole front end layer and a lower magnetic pole having a lower magnetic main layer, a lower magnetic pole front end portion on the lower magnetic main layer, and a projection step portion on the lower magnetic pole front end portion. The upper magnetic pole front end layer has a magnetic pole expansion position and a length from an air bearing surface to the magnetic pole expansion position is less than a length from the air bearing surface to gap depth position of the lower magnetic pole front end portion.Type: ApplicationFiled: December 3, 2004Publication date: April 14, 2005Inventors: Shigekazu Ohtomo, Moriaki Fuyama, Nobuo Yoshida, Hiroshi Fukui
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Publication number: 20050007698Abstract: A thin film magnetic head and a method of manufacture thereof, wherein the head includes a lower magnetic pole, an upper magnetic pole provided so as to face the lower magnetic pole, and a magnetic gap layer provided between the lower magnetic pole and the upper magnetic pole. The upper magnetic pole is formed by a sputtered first magnetic layer which is an underlayer and a plated second magnetic layer provided on the sputtered first magnetic layer.Type: ApplicationFiled: August 10, 2004Publication date: January 13, 2005Inventors: Kazue Kudo, Yasuyuki Okada, Moriaki Fuyama, Yohji Maruyama, Gen Oikawa
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Publication number: 20040257702Abstract: Disclosed are a thin-film magnetic recording head suitable for high density recording and its fabrication method elaborated to avoid corrosion of the main pole section of the head. A non-magnetic metal layer is formed on the top of the main pole.Type: ApplicationFiled: October 30, 2003Publication date: December 23, 2004Applicant: Hitachi., Ltd.Inventors: Hisashi Kimura, Moriaki Fuyama
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Publication number: 20040240121Abstract: A thin-film magnetic head having little temperature rise in the element, good heat dissipation and a short magnetic path length (narrow coil pitch) and manufacturing method for same is provided. To form the coil of the thin-film magnetic head, a lower coil is first formed and after forming alumina and an inorganic compound containing alumina, a trench is formed for the upper coil by reactive ion etching. The lower coil allows uniform etching at this time and functions as a film to prevent loading effects occurring during reactive ion etching. This trench is then plated in copper and chemical mechanical planarization performed to form the upper layer coil as the dual-layer coil of the present invention. Heat from the coil is efficiently radiated towards the substrate by alumina and an inorganic compound containing alumina with good heat propagation.Type: ApplicationFiled: August 29, 2003Publication date: December 2, 2004Inventors: Kimitoshi Etoh, Nobuo Yoshida, Moriaki Fuyama, Makoto Morijiri, Kenichi Meguro, Ichiro Oodake, Kazue Kudo, Yohji Maruyama, Katsuro Watanabe
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Patent number: 6795272Abstract: A thin film magnetic head includes a lower magnetic pole, an upper magnetic pole provided so as to face the lower magnetic pole, and a magnetic gap layer provided between the lower magnetic pole and the upper magnetic pole. The upper magnetic pole constitutes a first magnetic layer formed on a side facing the magnetic gap layer by means of sputtering and a second magnetic layer formed on the first magnetic layer by means of plating, in which the saturation magnetic flux density of the first magnetic layer is set higher than that of the second magnetic layer. The thin film magnetic head composed as above is capable of generating a stronger magnetic field owing to its stably-formed magnetic core, thereby recording on a high-coercivity medium and high-density recording are made possible.Type: GrantFiled: August 14, 2002Date of Patent: September 21, 2004Assignee: Hitachi, Ltd.Inventors: Kazue Kudo, Yasuyuki Okada, Moriaki Fuyama, Yohji Maruyama, Gen Oikawa
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Patent number: 6791795Abstract: A lower magnetic pole front end layer is formed on a lower magnetic pole main layer, and a lower magnetic pole projection layer, a recording gap layer and an upper magnetic pole front end layer each having substantially the same planar shape are formed on a planar surface of the lower magnetic pole front end layer. Trimming of a lower electrode is not necessary, and track width accuracy can be drastically improved because a resist frame is formed on the planar surface. A length of the upper magnetic pole front end layer from an air bearing surface to a head rear direction is greater than a length of the lower magnetic pole front end layer, and the rear end portion of the lower magnetic pole front end layer substantially defines a gap depth.Type: GrantFiled: August 16, 2002Date of Patent: September 14, 2004Assignee: Hitachi, Ltd.Inventors: Shigekazu Ohtomo, Moriaki Fuyama, Nobuo Yoshida, Hiroshi Fukui
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Publication number: 20040169959Abstract: A material for magnetic pole for attaining a writing head generating an intense recording magnetic field, and a structure and a manufacturing method therefor. The thin film magnetic head includes a magnetic pole layer having a plated magnetic layer containing Co, Ni and Fe formed on a plated underlayer of a sputtered magnetic layer containing Co, Ni and Fe. The CoNiFe magnetic layer having a composition: 40 wt %≦Co≦70 wt %, 10 wt %≦Ni≦25 wt % and 10 wt %≦Fe≦30 wt % and a peak intensity ratio in the X-ray diffraction of I(200)/I(111)≧0.5 and I(110)/I(111)≧1 (defining peak intensities for the face-centered cubic fcc (111) face, fcc (200) face and the body-centered cubic bcc (119) face as: I(111), I(200), I(110)).Type: ApplicationFiled: March 9, 2004Publication date: September 2, 2004Applicant: Hitachi, Ltd.Inventors: Kazue Kudo, Yasuyuki Okada, Nobuo Yoshida, Moriaki Fuyama, Noriyuki Saiki, Gen Oikawa, Takashi Kawabe, Makoto Morijiri
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Patent number: 6723449Abstract: A material for magnetic pole for attaining a writing head generating an intense recording magnetic field, and a structure and a manufacturing method therefor. The thin film magnetic head includes a magnetic pole layer having a plated magnetic layer containing Co, Ni and Fe formed on a plated underlayer of a sputtered magnetic layer containing Co, Ni and Fe. The CoNiFe magnetic layer having a composition: 40 wt %≦Co≦70 wt %, 10 wt %≦Ni≦25 wt % and 10 wt %≦Fe≦30 wt % and a peak intensity ratio in the X-ray diffraction of I(200)/I(111)≧0.5 and I(110)/I(111)≧1 (defining peak intensities for the face-centered cubic fcc (111) face, fcc (200) face and the body-centered cubic bcc (119) face as: I(111), I(200), I(110)).Type: GrantFiled: July 31, 2001Date of Patent: April 20, 2004Assignee: Hitachi, Ltd.Inventors: Kazue Kudo, Yasuyuki Okada, Nobuo Yoshida, Moriaki Fuyama, Noriyuki Saiki, Gen Oikawa, Takashi Kawabe, Makoto Morijiri
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Patent number: 6661606Abstract: A magnetic disk apparatus includes a magnetic disk for recording information and a magnetic head which has a reproducing head and a recording head. The reproducing head comprising a lower shield film, a magnetoresistive film, a pair of electrodes and an upper shield, and the recording head comprising an upper magnetic core, a lower magnetic core, and a coil disposed between said upper magnetic core and said lower magnetic core. The upper magnetic core and the lower magnetic core include an electroplated thin film with an average crystal grain size smaller than 500 Å, and the electroplated thin film is made of Ni—Fe alloy of which Ni is 38 to 60 wt % and Fe is 40 to 62 wt %.Type: GrantFiled: December 2, 2002Date of Patent: December 9, 2003Assignee: Hitachi, Ltd.Inventors: Masaaki Sano, Yoshiaki Kita, Shun-ichi Narumi, Takashi Kawabe, Moriaki Fuyama, Hisashi Takano, Hisano Yamamoto, Kenzo Masuda
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Patent number: 6633465Abstract: A magnetoresistive element includes a first antiferromagnetic film, a first magnetic film having a magnetization direction fixed by magnetic coupling with the first antiferromagnetic film, a second antiferromagnetic film, a second magnetic film having a magnetization direction fixed by magnetic coupling with the second antiferromagnetic film, a third magnetic film having a magnetization direction able to rotate in response to an applied magnetic field, a first nonmagnetic film disposed between the first magnetic film and the third magnetic film, and a second nonmagnetic film disposed between the second magnetic film and the third magnetic film. The third magnetic film is disposed between the first nonmagnetic film and the second nonmagnetic film, the first magnetic film is disposed between the first antiferromagnetic film and the first nonmagnetic film, and the second magnetic film is disposed between the second antiferromagnetic film and the second nonmagnetic film.Type: GrantFiled: April 25, 2001Date of Patent: October 14, 2003Assignee: Hitachi, Ltd.Inventors: Hiroyuki Hoshiya, Katsuya Mitsuoka, Masaaki Sano, Reiko Arai, Susumu Soeya, Hiroshi Fukui, Moriaki Fuyama, Fumio Sato
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Publication number: 20030123186Abstract: A slider having a thin film magnetic head. The thin film magnetic head has an upper magnetic core, a lower magnetic core and a coil disposed between the upper magnetic core and the lower magnetic core. The upper magnetic core and the lower magnetic core is an electroplated thin film with an average crystal grain size smaller than 500A.Type: ApplicationFiled: December 2, 2002Publication date: July 3, 2003Inventors: Masaaki Sano, Yoshiaki Kita, Shun-ichi Narumi, Takashi Kawabe, Moriaki Fuyama, Hisashi Takano, Hisano Yamamoto, Kenzo Masuda
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Publication number: 20030095357Abstract: A thin film magnetic head includes a lower magnetic pole, an upper magnetic pole provided so as to face the lower magnetic pole, and a magnetic gap layer provided between the lower magnetic pole and the upper magnetic pole. The upper magnetic pole constitutes a first magnetic layer formed on a side facing the magnetic gap layer by means of sputtering and a second magnetic layer formed on the first magnetic layer by means of plating, in which the saturation magnetic flux density of the first magnetic layer is set higher than that of the second magnetic layer. The thin film magnetic head composed as above is capable of generating a stronger magnetic field owing to its stably-formed magnetic core, thereby recording on a high-coercivity medium and high-density recording are made possible.Type: ApplicationFiled: August 14, 2002Publication date: May 22, 2003Inventors: Kazue Kudo, Yasuyuki Okada, Moriaki Fuyama, Yohji Maruyama, Gen Oikawa
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Patent number: 6563677Abstract: A magnetoresistive effect type reproducing head includes a lower magnetic shield made of magnetic material, an upper magnetic shield made of magnetic material, a magnetoresistive effect type element formed between the lower magnetic shield layer and the upper magnetic shield layer, a lower inter-layer insulating film formed between the magnetoresistive effect type element and the lower magnetic shield, and an upper inter-layer insulation film formed between the magnetoresistive effect type element and the upper magnetic shield. At least one of the lower and upper magnetic shields includes a first magnetic layer made of a first material having first electric resistivity and a second magnetic layer made of a second material having second electric resistivity higher than the first electric resistivity.Type: GrantFiled: January 8, 2002Date of Patent: May 13, 2003Assignee: Hitachi, Ltd.Inventors: Shun-ichi Narumi, Hiroshi Fukui, Katsumi Hoshino, Katsuo Watanabe, Kazue Kudo, Moriaki Fuyama