Patents by Inventor Yohji Maruyama
Yohji Maruyama 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: 8189293Abstract: According to one embodiment, a perpendicular magnetic recording head includes a shield having a groove and a main magnetic pole positioned in the groove of the shield. The groove includes a bottom side near a leading edge of the shield and inclined sides extending from the bottom side toward a trailing edge of the shield and from an ABS side of the head to a recessed side of the shield opposite the ABS. The shield is coupled to a non-magnetic layer at the recessed side, a cross-sectional area of the groove is less at a position nearer to the substrate than a position farther from the substrate, a cross-sectional area of the groove is less at a position nearer to the ABS side of the shield than a position farther from the ABS side of the shield, and a portion of the sides of the groove have curved surfaces.Type: GrantFiled: April 28, 2011Date of Patent: May 29, 2012Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Yasuhiro Wakabayashi, Kazue Kudo, Shouji Tokutake, Hiromi Shiina, Yohji Maruyama
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Publication number: 20120120528Abstract: A slider comprising a contact sensor element configured to respond to a change in resistance due to a change in temperature, and a shield structure. The shield structure comprises a lower thermal conductivity than the contact sensor element and a greater hardness than the contact sensor element.Type: ApplicationFiled: November 16, 2010Publication date: May 17, 2012Inventors: Masaru Furukawa, Yuki Shimizu, Junguo Xu, Yohji Maruyama, Takayoshi Ohtsu, Toshiya Shiramatsu
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Patent number: 8064161Abstract: Embodiments of the present invention help to provide a perpendicular magnetic recording head capable of writing a signal in a track having a small width. According to one embodiment, a perpendicular magnetic recording head includes an auxiliary pole, a main pole, a yoke, a coil, a first soft magnetic film and a second soft magnetic film. The yoke is in contact with the main pole. The coil is wound around a magnetic circuit composed of the auxiliary and main poles and the yoke. The first soft magnetic film is provided on both sides of the main pole with a non-magnetic film provided between the first soft magnetic film and the main pole. The second soft magnetic film is provided on the trailing side of the main pole with the non-magnetic film provided between the second soft magnetic film and the main pole. The first and second soft magnetic films are two types of plated magnetic films. One type of the plated magnetic films have respective thicknesses of 0.Type: GrantFiled: August 28, 2008Date of Patent: November 22, 2011Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Kazue Kudo, Hiromi Shiina, Gen Oikawa, Yohji Maruyama, Noriyuki Saiki
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Publication number: 20110249359Abstract: A magnetic head, according to one embodiment, includes a main magnetic pole having a protruding portion such that a distance from a first side of a trailing edge of the main magnetic pole to a leading edge of the main magnetic pole is different from a distance from a second side of the trailing edge of the main magnetic pole to the leading edge of the main magnetic pole, an auxiliary magnetic pole, and a coil wound around a magnetic circuit, the magnetic circuit including the main magnetic pole and the auxiliary magnetic pole. In another embodiment, a disk drive system includes a magnetic storage medium, at least one magnetic head as described previously for writing to the magnetic medium, a slider for supporting the magnetic head, and a control unit coupled to the magnetic head for controlling operation of the magnetic head. Additional systems and heads are also presented.Type: ApplicationFiled: April 8, 2010Publication date: October 13, 2011Inventors: Masafumi Mochizuki, Yohji Maruyama, Etoh Kimitoshi
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Patent number: 7995311Abstract: Embodiments of the present invention provide a magnetic shield composed of size-controlled small crystal grains and provide a more after-write read noise free thin film magnetic head. According to one embodiment of the present invention, an upper magnetic shield uses a multi-layered magnetic film formed by alternately stacking a face-centered cubic (fcc) crystalline magnetic thin layer and a body-centered cubic (bcc) crystalline magnetic thin layer by plating. The plating bath is such that the temperature is 30±1° C., pH is about 2.0?1.0 to 2.0+0.5, metal ion concentrations are about 5 to 25 (g/l) for Ni2+ and 5 to 15 (g/l) for Fe2+, saccharin sodium concentration is about 1.5±1.0 (g/l), sodium chloride concentration is about 25±5 (g/l), and boric acid concentration is about 25±5 (g/l). Each layer's crystal structure is different from that of its upper and lower layers, which results in size-controlled small crystal grains since the epitaxial growth is broken.Type: GrantFiled: June 19, 2007Date of Patent: August 9, 2011Assignee: Hitachi Global Storage Technologies Netherlands BVInventors: Kazue Kudo, Gen Oikawa, Yohji Maruyama, Noriyuki Saiki, Hiromi Shiina
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Publication number: 20110141616Abstract: In one embodiment, a magnetic recording head includes a main magnetic pole adapted for generating a magnetic field for recording information on a magnetic disk, a magnetic shield member adapted for suppressing spreading of a magnetic field output from the main magnetic pole through a non-magnetic insulation member, a side top gap, a side bottom gap, and a trailing gap. The side top gap is less than two times the trailing gap, the side bottom gap is larger than the side top gap, and the magnetic shield member is positioned on a sliding surface of the magnetic recording head and includes a trailing portion positioned adjacent the trailing gap in the trailing direction and at least one side portion positioned adjacent the side bottom gap in the cross-track direction. Other heads and systems are also presented according to various embodiments.Type: ApplicationFiled: December 10, 2010Publication date: June 16, 2011Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Ikuya Tagawa, Masafumi Mochizuki, Yohji Maruyama
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Publication number: 20110141615Abstract: According to one embodiment, a magnetic head for perpendicular recording includes a main pole, a first soft magnetic film disposed on a trailing side of the main pole, and a first nonmagnetic film interposed between the main pole and the first soft magnetic film. A thickness of the main pole is increased in a depth direction from an air bearing surface using an inclination, and a thickness of the first nonmagnetic film increases in the depth direction from the air bearing surface. In another embodiment, an angle from a horizontal plane of an upper surface of the first nonmagnetic film is greater than an angle from a horizontal plane of a lower surface of the first nonmagnetic film in contact with the main pole. Other heads, methods, and systems are described according to more embodiments.Type: ApplicationFiled: December 10, 2010Publication date: June 16, 2011Applicant: Hitachi Global Storage Technologies Netherlands B. V.Inventors: Kazue Kudo, Hiromi Shiina, Yohji Maruyama, Shouji Tokutake, Tetsuya Okai
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Publication number: 20110116192Abstract: A head-slider. The head-slider includes a slider, and a thin-film magnetic-recording head. The thin-film magnetic-recording head includes: a read element; a write element; a non-magnetic insulating protective layer disposed around both read and write elements; a resist disposed at a position further away from an air-bearing surface than the read element; and, a hard-material member including a material selected from the group consisting of silicon carbide and tungsten, which is disposed at a position further away from the air-bearing surface than the read element and the write element. Both an end of the resist and an end of the hard-material member overlap the write element when viewed in a stacking direction. A ratio of a distance from the air-bearing surface to a deepest end of the hard-material member to a distance from the air-bearing surface to a deepest end of the resist is at least 0.9.Type: ApplicationFiled: December 18, 2009Publication date: May 19, 2011Inventors: Shigeo FUJITA, Masahiko Soga, Hideaki Tanaka, Yuji Ueda, Tomohiro Okada, Takayoshi Ohtsu, Wataru Kimura, Yohji Maruyama
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Publication number: 20110090602Abstract: A head-gimbal assembly. The head-gimbal assembly includes a suspension, a head-slider coupled to the suspension, a magnetic-recording assistance element on the head-slider for applying an electromagnetic wave to a magnetic-recording disk, and a transmission line on the suspension for transmitting signals to the magnetic-recording assistance element. The transmission line includes an electrically conductive line for transmitting the signals, an upper shield placed above the electrically conductive line along the electrically conductive line, a lower shield placed below the electrically conductive line along the electrically conductive line, and a plurality of columns arranged at each of a right side and a left side of the electrically conductive line along the electrically conductive line for connecting the upper shield and the lower shield. The plurality of columns arranged at the right and left sides includes, respectively, a right linear array of columns and a left linear array of columns.Type: ApplicationFiled: September 22, 2009Publication date: April 21, 2011Inventors: Nobumasa NISHIYAMA, Yohji Maruyama
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Patent number: 7920359Abstract: Embodiments of the present invention achieve a high linear recording density and a high track recording density to thereby improve the areal recording density in a perpendicular magnetic recording apparatus having a magnetic head that includes a trailing shield and side shields around a main magnetic pole piece.Type: GrantFiled: January 31, 2008Date of Patent: April 5, 2011Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Yohji Maruyama, Nelson Cheng, Hideki Zaitsu, Hisao Okamoto
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Publication number: 20110002063Abstract: According to one embodiment, a perpendicular magnetic recording head includes a main magnetic pole having a trailing side and two lateral sides, a magnetic shield near the trailing side and both lateral sides of the main magnetic pole, the magnetic shield comprising: a first soft magnetic film with a relatively high saturation flux density positioned facing depthwise from a floating surface side thereof, a second soft magnetic film with a relatively low saturation flux density, and a first non-magnetic film. The head also includes a non-magnetic film interposed between the magnetic shield and the main magnetic pole, a first magnetic film magnetically coupled to the magnetic shield and the main magnetic pole on a side opposite a floating surface side thereof, and a coil surrounding a magnetic circuit, the magnetic circuit comprising the main magnetic pole and the first magnetic film. Other systems and methods are also described.Type: ApplicationFiled: June 30, 2010Publication date: January 6, 2011Inventors: Yohji Maruyama, Tadayuki Iwakura, Tetsuya Okai, Hiromi Shiina, Kazue Kudo
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Patent number: 7842408Abstract: Embodiments of the present invention provide a magnetic disk drive capable of allowing higher data transfer rates and higher recording densities. According to one embodiment, an upper magnetic core and lower magnetic core comprise a multi-layered magnetic film formed by alternately stacking a face-centered cubic (fcc) crystalline magnetic thin layer and a body-centered cubic (bcc) crystalline magnetic thin layer by plating. The plating bath is such that the temperature is about 30±1° C., pH is about 2.0?1.0 to 2.0+0.5, metal ion concentrations are about 5 to 25 (g/l) for Ni2+ and 5 to 15 (g/l) for Fe2+, saccharin sodium concentration is about 1.5±1.0 (g/l), sodium chloride concentration is about 25±5 (g/l), and boric acid concentration is about 25±5 (g/l). Since each layer's crystal structure is different from that of its adjacent lower layer, epitaxial growth is broken within each layer.Type: GrantFiled: June 19, 2007Date of Patent: November 30, 2010Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Kazue Kudo, Gen Oikawa, Yohji Maruyama, Noriyuki Saiki, Hiromi Shiina
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Publication number: 20100157476Abstract: A perpendicular magnetic recording head according to one embodiment includes a main pole; first magnetic films arranged on both sides of the main pole in a track width direction via nonmagnetic films; and a second magnetic film arranged on a trailing side of the main pole via a nonmagnetic film; wherein the depths of the first magnetic films from an air bearing surface are smaller than the depth of the second magnetic film from the air bearing surface at least at a periphery of the main pole.Type: ApplicationFiled: December 15, 2009Publication date: June 24, 2010Inventors: Kazue Kudo, Hiromi Shiina, Yohji Maruyama, Tetsuya Okai, Gen Oikawa, Shouji Tokutake
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Patent number: 7460335Abstract: A magnetic head comprises a retrieving unit for converting magnetic information output from a recording medium into an electric signal, a writing unit having the function of electromagnetic conversion for writing the magnetic information in the recording medium in response to the electric signal, and a first protective film formed on the retrieving unit. A second protective film is formed on the first protective film. The coefficient of linear expansion of the second protective film is reduced in comparison with that of the first protective film. Furthermore, the first protective film is an alumina film; in contrast, the second protective film is a film made of an alumina film containing silicon oxide therein.Type: GrantFiled: May 1, 2006Date of Patent: December 2, 2008Assignee: Hitachi Global Technologies Japan, Ltd.Inventors: Yohji Maruyama, Tadayuki Iwakura, Takashi Kawabe, Makoto Morijiri, Hiroshi Fukui
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Patent number: 7443625Abstract: In the present invention, by making the width of the write element larger than the track pitch and securing a write magnetic field strong enough to reverse the magnetization of the magnetic layer, and further by writing while shifting a write head comprising the write element, a magnetic disk drive, of which the track width is narrower than the write element width, and the storage capacity is large, is realized.Type: GrantFiled: April 17, 2006Date of Patent: October 28, 2008Assignee: Hitachi Global Storage Technologies Japan Ltd.Inventors: Takehiko Hamaguchi, Atsushi Nakamura, Yasutaka Nishida, Hisashi Takano, Yohji Maruyama, Hiroshi Ide, Hideki Sawaguchi, Futoshi Tomiyama
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Publication number: 20080180861Abstract: Embodiments of the present invention achieve a high linear recording density and a high track recording density to thereby improve the areal recording density in a perpendicular magnetic recording apparatus having a magnetic head that includes a trailing shield and side shields around a main magnetic pole piece.Type: ApplicationFiled: January 31, 2008Publication date: July 31, 2008Inventors: Yohji Maruyama, Nelson Cheng, Hideki Zaitsu, Hisao Okamoto
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Publication number: 20080075977Abstract: Embodiments of the present invention provide a magnetic disk drive capable of allowing higher data transfer rates and higher recording densities. According to one embodiment, an upper magnetic core and lower magnetic core comprise a multi-layered magnetic film formed by alternately stacking a face-centered cubic (fcc) crystalline magnetic thin layer and a body-centered cubic (bcc) crystalline magnetic thin layer by plating. The plating bath is such that the temperature is about 30±1° C., pH is about 2.0?1.0 to 2.0+0.5, metal ion concentrations are about 5 to 25 (g/l) for Ni2+ and 5 to 15 (g/l) for Fe2+, saccharin sodium concentration is about 1.5±1.0 (g/l), sodium chloride concentration is about 25±5 (g/l), and boric acid concentration is about 25±5 (g/l). Since each layer's crystal structure is different from that of its adjacent lower layer, epitaxial growth is broken within each layer.Type: ApplicationFiled: June 19, 2007Publication date: March 27, 2008Applicant: Hitachi Global Storage Netherlands B.V.Inventors: Kazue Kudo, Gen Oikawa, Yohji Maruyama, Noriyuki Saiki, Hiromi Shiina
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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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Publication number: 20080002308Abstract: Embodiments of the present invention provide a magnetic shield composed of size-controlled small crystal grains and provide a more after-write read noise free thin film magnetic head. According to one embodiment of the present invention, an upper magnetic shield uses a multi-layered magnetic film formed by alternately stacking a face-centered cubic (fcc) crystalline magnetic thin layer and a body-centered cubic (bcc) crystalline magnetic thin layer by plating. The plating bath is such that the temperature is 30±1° C., pH is about 2.0-1.0 to 2.0+0.5, metal ion concentrations are about 5 to 25 (g/l) for Ni2+ and 5 to 15 (g/l) for Fe2+, saccharin sodium concentration is about 1.5±1.0 (g/l), sodium chloride concentration is about 25±5 (g/l), and boric acid concentration is about 25±5 (g/l). Each layer's crystal structure is different from that of its upper and lower layers, which results in size-controlled small crystal grains since the epitaxial growth is broken.Type: ApplicationFiled: June 19, 2007Publication date: January 3, 2008Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Kazue Kudo, Gen Oikawa, Yohji Maruyama, Noriyuki Saiki, Hiromi Shiina
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Patent number: 7110218Abstract: In a convention inductive head, since a large magnetic field is leaked from the end of the magnetic pole end of an upper magnetic core, at recording the recording magnetic field is applied to a recording media in a region larger than a desired track width, thereby damaging the adjacent information. In an inductive head according to the present invention, in order to efficiently carry a magnetic flux to a magnetic pole tip layer, the top surface of the rear end of the magnetic pole tip layer is etched away so as to connect the rear end of the magnetic pole tip layer to the front end of an upper magnetic core having a width larger than that of the rear end of the magnetic pole tip layer. It is possible to realize a recording head having a large recording magnetic field.Type: GrantFiled: March 4, 2004Date of Patent: September 19, 2006Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Shunichi Narumi, Hiroyuki Hoshiya, Yohji Maruyama