Magnetic Base Or Coating Patents (Class 427/127)
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Publication number: 20070297077Abstract: The present invention provides a method of manufacturing a master recording medium used for magnetic transfer and having a concavo-convex pattern formed on a surface of the recording medium, the method comprising: a surface treatment step of forming the concavo-convex pattern on a surface of a metal plate to fabricate a metal master disk; a monomolecular layer forming step of forming a monomolecular layer on a surface of the metal master disk, the surface having the concavo-convex pattern formed thereon; a metallic substrate forming step of dipping the metal master disk having the monomolecular layer formed thereon into a plating solution and forming the master recording medium by plating on the surface of the metal master disk, the surface having the monomolecular layer formed thereon; and an exfoliating step of exfoliating the master recording medium from the metal master disk.Type: ApplicationFiled: June 18, 2007Publication date: December 27, 2007Applicant: FUJIFILM CORPORATIONInventors: Yanlong CHE, Toshiya Takahashi
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Publication number: 20070281078Abstract: According to one embodiment, a patterned media includes a magnetic film processed into patterns for tracks, servo zones or data zones, and a nonmagnetic filling material filled between patterns of the magnetic film for the tracks, servo zones or data zones and including a base material and a barrier material formed of a metal that does not constitute the base material.Type: ApplicationFiled: May 30, 2007Publication date: December 6, 2007Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Akira Kikitsu, Yoshiyuki Kamata, Masatoshi Sakurai, Satoshi Shirotori
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Patent number: 7299537Abstract: An inductor comprises a substrate comprising a semiconductor material, a first dielectric layer over the substrate, a magnetic layer over the first dielectric layer, a second dielectric layer over the magnetic layer, and a conductor over the second dielectric layer.Type: GrantFiled: July 15, 2004Date of Patent: November 27, 2007Assignee: Intel CorporationInventor: Donald S. Gardner
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Patent number: 7301734Abstract: A GMR sensor having improved longitudinal biasing is provided as is a method of forming it. The improved biasing is provided by longitudinal biasing structures in which a soft magnetic layer is interposed between a hard magnetic biasing layer and the lateral edge of the GMR sensor element. The soft magnetic layer eliminates the need for a seed layer directly between the hard magnetic layer and the GMR element and provides improved coupling to the free layer of the GMR element and a substantial reduction in random domain variations.Type: GrantFiled: August 24, 2005Date of Patent: November 27, 2007Assignee: Headway Technologies, Inc.Inventors: Yimin Guo, Li-Yan Zhu
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Patent number: 7299535Abstract: Methods for forming data storage media and the media formed thereby are disclosed herein. In one embodiment, the method for forming a data storage media, comprises: injection molding a substrate comprising surface features, wherein said surface features have greater than about 90% of a surface feature replication of an original master; and disposing a data layer over at least one surface of said substrate; wherein said data storage media has an axial displacement peak of less than about 500? under shock or vibration excitation.Type: GrantFiled: January 14, 2004Date of Patent: November 27, 2007Assignee: General Electric CompanyInventors: Thomas P. Feist, Wit C. Bushko, Herbert S. Cole, John E. Davis, Thomas B. Gorczyca, Joseph T. Woods
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Patent number: 7296478Abstract: In a master carrier for magnetic transfer which comprises a support that has a transfer-recording pattern arrayed in the track direction thereof in accordance with the information to be transferred to a magnetic recording medium, and a magnetic layer formed on the transfer-recording pattern of the support, the in-plane distance L (mm) between the hill and the valley of the warped master carrier, the vertical-direction distance H (?m) between the two, and the thickness d (mm) of the master carrier are so defined that they satisfy a relation of 0.05?H·d3/L?0.6.Type: GrantFiled: March 3, 2006Date of Patent: November 20, 2007Assignee: Fujifilm CorporationInventors: Masakazu Nishikawa, Naoto Fujiwara
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Patent number: 7296339Abstract: A method and system for manufacturing a perpendicular magnetic recording head is disclosed. The method and system include providing a chemical mechanical planarization (CMP) uniformity structure having an aperture therein and forming a perpendicular magnetic recording pole within the aperture. The CMP uniformity structure may include a CMP barrier layer. The method and system further include fabricating an insulator after formation of the perpendicular magnetic recording pole and performing a CMP to remove a portion of the insulator, expose a portion of the perpendicular magnetic recording pole and planarize an exposed surface of the perpendicular magnetic recording head.Type: GrantFiled: September 8, 2004Date of Patent: November 20, 2007Assignee: Western Digital (Fremont), LLCInventors: Danning Yang, Yingjian Chen, Brant Nease, Kyusik Sin
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Patent number: 7297362Abstract: A magnetic recording medium and a manufacturing method for making it are disclosed. The method facilitates preventing the lubricant deposited on the end face of the magnetic recording medium from migrating onto the major surfaces thereof. The lubricant deposited on an end face of a magnetic disk, which may migrate onto the major surfaces of the magnetic disk, is wiped off by the rotating magnetic disk with the lubricant deposited thereon, by spraying a solvent onto a wiping tape while feeding the wiping tape, and by pressing the wet wiping tape containing the solvent to the end face of the magnetic disk with a pad while the feeding of the wiping tape is discontinued. Alternatively, the lubricant deposited on the end face of a magnetic disk is solidified to deprive the lubricant of its fluidity by rotating the magnetic disk with the lubricant deposited thereon while irradiating it with ultraviolet radiation from a UV lamp through a slit opened in a shield on the lamp to the end face of the magnetic disk.Type: GrantFiled: April 23, 2004Date of Patent: November 20, 2007Assignee: Fuji Electric Device Technology Co., Ltd.Inventor: Makoto Isozaki
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Publication number: 20070264423Abstract: A manufacturing method of a TMR element having a tunnel barrier layer sandwiched between lower and upper ferromagnetic layers. A fabricating process of the tunnel barrier layer includes a step of depositing a first metallic material film on the lower ferromagnetic layer, a step of oxidizing the deposited first metallic material film using an oxygen gas with a first pressure, a step of depositing a second metallic material film of the same material as that of the first metallic film or of metallic material containing primarily the same material as that of the first metallic film, on the oxidized first metallic film, and a step of oxidizing the deposited second metallic material film using an oxygen gas with a second pressure that is lower than the first pressure.Type: ApplicationFiled: April 30, 2007Publication date: November 15, 2007Applicant: TDK CORPORATIONInventors: Satoshi MIURA, Takumi UESUGI
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Publication number: 20070259210Abstract: A structure has a substrate and a layer containing a magnetic material dispersed in a nonmagnetic material, the magnetic material being comprised of first crystal particles having an easy magnetization axis crytsllographically oriented in the direction of the normal line of the substrate and forming columns perpendicular to the substrate and second crystal particles having a crystallographic orientation in a direction different from the direction of the crystallographic orientation in the first crystal particles, and the ratio of the second crystal particles to the entire crystal particles in the columns ranging from 10% to 50% by weight.Type: ApplicationFiled: April 26, 2007Publication date: November 8, 2007Applicant: CANON KABUSHIKI KAISHAInventors: Shigeru Ichihara, Toru Den
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Patent number: 7290324Abstract: A magnetic head including a media heating device. Following the fabrication of the heating device, a sacrificial layer of material is deposited to protect the heating device during subsequent process steps. Thereafter, write head components, such as write head induction coils and/or a P1 pole pedestal are fabricated above the heating device, and the sacrificial layer is substantially consumed in protecting the heating device during the aggressive etching and milling steps used to create those components. Further components, including a second magnetic pole are thereafter fabricated to complete the fabrication of the write head portion of the magnetic head. The sacrificial layer may be comprised of alumina, or a material such as NiFe that can act as a seed layer for a subsequent head components such as the P1 pole pedestal.Type: GrantFiled: September 19, 2005Date of Patent: November 6, 2007Assignee: Hitachi Global Storage Technologies Netherlands, B.V.Inventors: Robert E. Fontana, Jr., Jeffrey S. Lille
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Patent number: 7288281Abstract: Fe rich CoFe can be used in AP1 to enhance CPP GMR. However, this is found to degrade the electro-migration performance of the device. This problem has been solved by using an AP1 that is a laminate of several CoFe(25%) layers, separated from one another by copper layers. Ultra-thin layers of iron-rich CoFe are then inserted at all the copper-CoFe interfaces.Type: GrantFiled: September 2, 2004Date of Patent: October 30, 2007Assignee: Headway Technologies, Inc.Inventors: Min Li, Kunliang Zhang, Cheng T. Horng, Chyu Jiuh Torng, Yu-Hsia Chen, Ru-Ying Tong
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Patent number: 7284316Abstract: A method for forming a hard bias structure in a magnetoresistive sensor is disclosed. A magnetoresistive sensor having a soft magnetic bias layer, spacer layer, and a magnetoresistive layer, is formed over a substrate having a gap layer. A mask is formed over a portion of the magnetoresistive sensor structure to define a central region. The masked structure is ion milled to remove portions not shielded by the mask, to form the central region with sloped sides, and to expose a region of the gap layer laterally adjacent the sloped sides. A first underlayer is deposited onto at least the sloped sides at a high deposition angle. A second underlayer is deposited to at least partially overlap the first underlayer, and at a first lower deposition angle. A hard bias layer is deposited over at least a portion of the second underlayer, and at a second lower deposition angle.Type: GrantFiled: November 17, 2004Date of Patent: October 23, 2007Assignee: Western Digital (Fremont), LLCInventors: Yiming Huai, Jinqiu Zhang, Jing Zhang
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Patent number: 7281317Abstract: A manufacturing method of a flying magnetic head slider includes a step of providing a substrate with a plurality of inductive write head elements formed thereon, each head element having a pair of magnetic poles facing to each other via a magnetic gap, and with a protection layer covering the plurality of inductive write head elements, a step of cutting the substrate to separate into a plurality of bar members, each of the bar members having aligned inductive write head elements, a step of processing the protection layer of each bar member so that a distance from an end edge of the pair of magnetic poles to an edge of a bottom surface of the bar member becomes in a range of 1 to 15 ?m, a step of lapping each bottom surface of the bar member, and cutting each bar member to separate into a plurality of individual magnetic head sliders.Type: GrantFiled: July 8, 2004Date of Patent: October 16, 2007Assignee: SAE Magnetics (H.K.) Ltd.Inventors: Morihiro Ohno, Osamu Fukuroi, Ryuji Fujii
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Publication number: 20070231603Abstract: A magnetic field generating method and a permanent magnetic circuit for, using magnetic field heat treatment, imparting axisymmetric anisotropy in a direction parallel to the substrate to a soft magnetic body, particularly a soft magnetic backing layer for a perpendicular two-layered magnetic recording medium used in perpendicular magnetic recording. In a rare earth permanent magnetic circuit that exhibits hardly any demagnetization at high temperature, a plurality of magnet side faces 95 orthogonal to pole faces 94 are disposed with space therebetween. A magnetic field that is substantially antiparallel to magnetization 91 is generated in the space, and an unprocessed sample is inserted. Further, the permanent magnetic circuit with the unprocessed sample inserted therein is placed in a heat treatment furnace, and the unprocessed sample is rotated 96 as desired.Type: ApplicationFiled: March 30, 2007Publication date: October 4, 2007Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventor: Ken OHASHI
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Publication number: 20070231471Abstract: A method for manufacturing a magnetic recording medium is provided which has high recording density and which is less likely to cause problems of a magnetic tape such as inappropriate contact with a head, unstable running, and damage. A back-coat layer containing plate-like inorganic pigment (plate-like inorganic pigment-containing layer) is formed over a non-magnetic support to produce an intermediate product having the support and the back-coat layer. Then, the intermediate product is subjected to calendering between at least one pair of metal rolls.Type: ApplicationFiled: March 26, 2007Publication date: October 4, 2007Applicant: TDK CORPORATIONInventors: Katsuhiko Yamazaki, Tsutomu Ide
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Publication number: 20070229998Abstract: A master for magnetic transfer is made which comprises a substrate which has on a surface thereof a convex area and a concave area corresponding to servo information and which is constituted of a soft magnetic, and a ferromagnetic which is provided in the concave portion of the substrate, which has a coercive force larger than the external magnetic field for reversing the direction of magnetization of the vertical recording medium, and which has magnetization in a direction opposite to the direction of the external magnetic field.Type: ApplicationFiled: August 21, 2006Publication date: October 4, 2007Inventors: Sumio Kuroda, Takeshi Morikawa
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Patent number: 7273534Abstract: In an optical disk substrate film-formation apparatus which prepared an optical disk by forming a thin film on a substrate, the optical disk substrate is held by a holder section. A contact support surface is provided to the holder section which closely contacts at least a portion of the surface of the optical disk substrate rear to the surface where the think film is formed.Type: GrantFiled: July 22, 2004Date of Patent: September 25, 2007Assignee: Ricoh Company, Ltd.Inventors: Kazunori Ito, Katsunari Hanaoka, Hiroshi Deguchi, Nobuaki Onagi, Hiroko Tashiro, Kiyoto Shibata, Yasutomo Aman, Hiroshi Miura, Wataru Ohtani, Hajime Yuzurihara, Masaru Shinkai
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Patent number: 7272883Abstract: In one illustrative example disclosed, a method for use in making a magnetic head involves forming a thermal-assist heater for the magnetic head; forming a plurality of coil layers of a write coil using a damascene process; and simultaneously forming an electrical connection to the thermal-assist heater in the same damascene process used to form the write coil. Advantageously, fabrication steps are reduced using a parallel process that provides for relatively small dimensions and reduces the possibility of electrical shorting. The method may be alternatively used to form an electrical connection to any other suitable electrical device for the magnetic head, such as an electrical lapping guide (ELG) or other component.Type: GrantFiled: August 29, 2003Date of Patent: September 25, 2007Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Quang Van Le, Jeffrey Scott Lille
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Patent number: 7269889Abstract: As a protective film of an element and a slider in a magnetic head, a film is provided which is excellent in adhesiveness to a film forming surface and which shows sufficient corrosion-resistance property with a thinner thickness. To provided this film, according to the present invention, a DLC film as a protective film is formed onto an element portion end surface and a surface of a slider of a magnetic head core. A film deposition step is conducted plural times to obtain the DLC film with a predetermined thickness when the DLC film is formed using an electric discharge.Type: GrantFiled: September 10, 2002Date of Patent: September 18, 2007Assignee: TDK CorporationInventors: Kunihiro Ueda, Kentaro Nagai, Hiroki Nakazawa
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Patent number: 7266880Abstract: A method for fabricating a multi-track thin-film magnetoresistive tape head with precisely-aligned read/write track-pairs fabricated on a monolithic substrate wafer is provided. The wafer is fabricated using modified standard thin-film processes for fabricating direct access storage device heads and modified substrate lapping procedures. Gap-to-gap separation within each read/write track-pair is reduced to nearly the thickness of the substrate wafer. Fabricating on both sides of the wafer, may enable hundreds or thousands of head elements to be aligned in one step of the fabrication process while reducing the number of pieces in the completed head assembly.Type: GrantFiled: September 26, 2003Date of Patent: September 11, 2007Assignee: International Business Machines CorporationInventors: Robert Glenn Biskeborn, James Howard Eaton
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Patent number: 7266881Abstract: A hermetically sealed mobile hard disk drive that combines high storage capacity and performance with low power consumption and portable operation, including an integrated base substrate. One embodiment is a method for fabricating an integrated base substrate with a plurality of spiral conductors, MR stripes, and interconnect conductors fabricated by a semiconductor process, and upon which electronic integrated circuits are later assembled. Various embodiments of the invention can support a single or dual rotor spindle assembly, a multi-arm actuator assembly, and a housing to form a hermetically sealed chamber with the integrated base substrate. Various embodiments of the invention can be filled with low viscosity gas at ambient pressure or a lower than ambient pressure.Type: GrantFiled: June 10, 2005Date of Patent: September 11, 2007Inventor: James Bryant Money
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Publication number: 20070207291Abstract: A recording medium cartridge and producing method thereof, such that slidability of resin-fabricated members of different materials against one another can be assured even in conditions in which impacts are successively applied. The recording medium cartridge is provided with a recording medium T and a plurality of resin-fabricated components. A mixture C of perfluoropolyethylene and polytetrafluoroethylene is interposed at boundary surfaces at which the resin-fabricated components of different material slide against one another and/or at boundary surfaces at which the resin-fabricated components of different material slide against one another.Type: ApplicationFiled: March 2, 2007Publication date: September 6, 2007Applicant: FUJIFILM CorporationInventor: Kazuo Hiraguchi
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Publication number: 20070196565Abstract: Provided is a method for manufacturing a magnetic recording medium that has a concavo-convex patterned recording layer, sufficient flatness, and excellent recording/reproducing properties. A filling material is deposited over a workpiece including a substrate; a recording layer formed over the substrate in a predetermined concavo-convex pattern of which convex portions are recording elements; and a detection material formed over the recording elements. Process gas is irradiated to the surface to remove a portion of the filling material and the detection material to flatten the surface. An element contained in the detection material removed and flying off is detected on the basis of its atomic mass number. The irradiation of the process gas is then stopped according to the detection result. The detection material contains an element selected from the group consisting of aluminum, yttrium, zirconium, niobium, rhodium, silver, terbium, tantalum, gold, bismuth, titanium, indium, and tungsten.Type: ApplicationFiled: February 22, 2007Publication date: August 23, 2007Applicant: TDK CORPORATIONInventors: Takahiro Suwa, Kazuya Shimakawa
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Publication number: 20070178229Abstract: A method of fabricating a film of magnetic nanocomposite particles including depositing isolated clusters of magnetic nanoparticles onto a substrate surface and coating the isolated clusters of magnetic nanoparticles with an insulator coating. The isolated clusters of magnetic nanoparticles have a dimension in the range between 1 and 300 nanometers and are separated from each other by a distance in the range between 1 and 50 nanometers. By employing PVD, ablation, and CVD techniques the range of useful film thicknesses is extended to 10-1000 nm, suitable for use in wafer based processing. The described methods for depositing the magnetic nanocomposite thin films are compatible with conventional IC wafer and Integrated Passive Device fabrication.Type: ApplicationFiled: January 29, 2007Publication date: August 2, 2007Inventors: Albert S. Bergendahl, Paul C. Castrucci, Daniel J. Fleming, T. D. Xiao
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Patent number: 7249407Abstract: A method of manufacturing a magnetic head is provided which can improve controlling a thickness of a gap layer. A coil base layer having at least a surface layer formed of one or two or more alloys selected from Au, Ru, and Rh is formed on a contact layer. Thereby, since a surface of the coil base layer is not oxidized due to air exposure, the contact layer is not oxidized. As such, the coil base layer protects the contact layer, so that it is not necessary to perform an etching process for removing an oxide layer, as in the related art. Therefore, it is possible to further improve controlling a thickness of a gap layer without cutting the gap layer by the etching process, as compared with the related art.Type: GrantFiled: February 1, 2006Date of Patent: July 31, 2007Assignee: Alps Electric Co., Ltd.Inventor: Kiyoshi Kobayashi
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Publication number: 20070172704Abstract: A patterned medium and a method of manufacturing the same are provided. The patterned medium includes a data region having a plurality of recording dots arrayed along a plurality of tracks; and a non-data region comprising a part of the patterned medium other than the data region, the non-data region having a plurality of pattern marks. The method includes depositing an aluminum layer on a base substrate; depositing a photo-resist on the aluminum layer; forming a pattern on the photo-resist using a lithography process; forming a fine pattern by forming a plurality of cavities on a portion of the aluminum layer which is exposed through the photo-resist; removing the photo-resist; forming a mold pattern; imprinting the mold pattern on a media substrate to form cavities on the media substrate; and filling the cavities with a recording material.Type: ApplicationFiled: January 12, 2007Publication date: July 26, 2007Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Byung-kyu Lee, No-yeol Park, Jin-seung Sohn, Seong-yong Yoon
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Publication number: 20070172584Abstract: A method of manufacturing a patterned magnetic recording medium includes coating a magnetic film with a resist which is decomposed by exposure to electromagnetic radiation or an electron beam to have a low molecular weight, forming a pattern on the resist by an imprinting method, transferring the pattern to the magnetic film by using the resist having the pattern formed thereon as a mask, and removing the resist by exposing the resist to the electromagnetic radiation or the electron beam.Type: ApplicationFiled: January 25, 2007Publication date: July 26, 2007Applicant: Kabushiki Kaisha ToshibaInventors: Naoko Kihara, Satoshi Shirotori, Yoshiyuki Kamata, Masatoshi Sakurai
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Patent number: 7246424Abstract: A magnetic device having a magnetic feature, the magnetic feature including a magnetic portion comprising a magnetic material, a region of non-magnetic material adjacent to the magnetic portion, and a stop layer disposed above the region of non-magnetic material, defining a planar upper boundary of the magnetic portion.Type: GrantFiled: April 13, 2004Date of Patent: July 24, 2007Assignee: Seagate Technology LLCInventors: Picheng Huang, Paul E. Anderson, Laura C. Stearns, Song S. Xue
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Publication number: 20070166571Abstract: An aspect of the present invention provides a magnetic recording medium comprising following layers in this order on at least one surface of a nonmagnetic support: a nonmagnetic layer including a nonmagnetic powder and a binder; and a magnetic layer including a magnetic powder and a binder, wherein the nonmagnetic support has an enthalpy relaxation (?H) equal to or more than 0.5 J/g and equal to or less than 2.0 J/g. According to the aspect of the present invention, a magnetic recording medium is provided that is superior in electromagnetic conversion (e.g., with a high S/N ratio for surface recording density) and running durability (e.g., with a small number of dropouts and a low error rate).Type: ApplicationFiled: January 5, 2007Publication date: July 19, 2007Applicant: FUJIFILM CorporationInventors: Katsuhiko Meguro, Masatoshi Takahashi
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Patent number: 7241471Abstract: A method of fabricating a low-noise, high-output and large-capacity magnetic recording medium compatible with the AIT3 format in which a metal magnetic film is formed by the vacuum evaporation process under supply of oxygen is disclosed. In the vacuum evaporation process, the running speed of a non-magnetic support is controlled within a range from 150 to 200 m/min, and on thus continuously fast-running, non-magnetic support, a Co magnetic thin film is formed under supply of oxygen so as to achieve a coercive force Hc of the Co magnetic thin film of 100 to 115 kA/m, and a squareness ratio of 0.79 or larger.Type: GrantFiled: July 6, 2004Date of Patent: July 10, 2007Assignee: Sony CorporationInventors: Yasumi Sato, Jota Ito
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Patent number: 7237321Abstract: A method is described which uses a CMP resistant metal layer to replace the upper dielectric layer in the track width definition phase of a TMR or CPP spin valve magnetic head. The metal which is selected to be resistant to the CMP process can be rhodium (Rh), platinum (Pt), chromium (Cr), vanadium (V), etc. The additional CMP resistance of the refill layer structure provides a much larger processing window which results in higher yields. A CPP head according to the invention has a metal layer according to the invention above the hard bias structures on the sides of the sensor which define the track width.Type: GrantFiled: July 30, 2004Date of Patent: July 3, 2007Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Marie-Claire Cyrille, Frederick Hayes Dill, Jui-Lung Li
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Patent number: 7237322Abstract: A method for making a tunnel valve head with a flux guide. The tunnel valve sensor is created by forming a tunnel valve at a first shield layer. The tunnel valve includes a free layer distal to the first shield layer, a first insulation layer deposited over the first shield layer and around the tunnel valve, a flux guide formed over the first insulation layer and coupling to the tunnel valve at the free layer, a second insulation layer formed over the flux guide and a second shield layer formed over the second insulation layer. The flux guide and the free layer are physically isolated by the first and second insulation layers to prevent current shunts therefrom. The structure achieves physical connection between the flux guide and the free layer and insulates the flux guide from the shields.Type: GrantFiled: October 29, 2004Date of Patent: July 3, 2007Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventor: Hardayal Singh Gill
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Patent number: 7236324Abstract: An apparatus, system, and method are disclosed for utilizing a “shadow mask” approach to fabricate servo patterns on high density patterned media. The apparatus may include a deposition mask having a plurality of apertures generated by a conventional lithographic process. Material may be deposited onto a substrate through the deposition mask apertures from at least one deposition source oriented at unique deposition angles. In this manner, each aperture may correspond to multiple deposition locations. Apertures may be precisely dimensioned and positioned to create servo pattern features from the resulting deposition locations. The deposition mask may also include a plurality of bit pattern apertures adapted to direct a material to a plurality of deposition locations on the substrate, the deposition locations forming a bit pattern concurrent with formation of a servo pattern.Type: GrantFiled: October 18, 2005Date of Patent: June 26, 2007Assignee: Hitachi Global Storage TechnologiesInventors: Thomas Robert Albrecht, Zvonimir Z. Bandic
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Patent number: 7225528Abstract: A method for manufacturing a magnetic recording medium that has a sufficiently flat surface and includes a recording layer having a concavo-convex pattern that provides favorable accuracy of recording and reproduction. The manufacturing method includes the steps of: forming a lower non-magnetic film over a recording layer having a concavo-convex pattern; and forming an upper non-magnetic film on the lower non-magnetic film to fill concave portions 34 of the concavo-convex pattern. A bias power is applied to an object to be processed at least in the step of forming the upper non-magnetic film, and no bias power or a smaller bias power than the bias power applied in the step of forming the upper non-magnetic film is applied in the formation of the lower non-magnetic film.Type: GrantFiled: October 26, 2004Date of Patent: June 5, 2007Assignee: TDK CorporationInventors: Takahiro Suwa, Mitsuru Takai, Kazuhiro Hattori, Shuichi Okawa
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Patent number: 7223439Abstract: A magnetic recording medium and a method for manufacturing the same are provided, which provide high surface recording density and high recording/reading performance. The magnetic recording medium is manufactured by forming an intermediate protective layer between a continuous recording layer and a first mask layer, dividing the continuous recording layer to form divided recording elements, and then removing the first mask layer while leaving the intermediate protective layer on the top of the divided recording elements. Further, gaps between the divided recording elements are filled with a non-magnetic material before removing the first mask layer.Type: GrantFiled: March 22, 2004Date of Patent: May 29, 2007Assignee: TDK CorporationInventors: Takahiro Suwa, Mitsuru Takai, Kazuhiro Hattori
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Patent number: 7223438Abstract: A direct-write method for fabricating magnetic nanostructures, including hard magnetic nanostructures of barium hexaferrite, BaFe, based on nanolithographic printing and a sol-gel process. This method utilizes a conventional atomic force microscope tip, coated with a magnetic material precursor solution, to generate patterns that can be post-treated at elevated temperature to generate magnetic features consisting of barium ferrite in its hexagonal magnetoplumbite (M-type) structure. Features ranging from several hundred nm down to below 100 nm were generated and studied using AFM, magnetic force microscopy, and X-ray photoelectron spectroscopy. The approach offers a new way for patterning functional inorganic magnetic nanostructures with deliberate control over feature size and shape, as well as interfeature distance and location.Type: GrantFiled: September 17, 2003Date of Patent: May 29, 2007Assignee: Northwestern UniversityInventors: Chad A. Mirkin, Lei Fu, Xiaogang Liu, Vinayak P. Dravid
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Patent number: 7220370Abstract: A method of producing a fine metal component where a plated coating is deposited on a conductive film exposed at fine through-hole pattern portions in a mold to produce a fine metal component, wherein the conductive film is made using a conductive paste comprised of a metal powder in which the metal particles are magnetically linked together in a chain shape.Type: GrantFiled: August 21, 2002Date of Patent: May 22, 2007Assignee: Sumitomo Electric Industries, Ltd.Inventors: Jun Yorita, Shinji Inazawa, Masatoshi Majima, Hideki Kashihara, Toshihiro Sakamoto, Hideaki Toshioka
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Patent number: 7210217Abstract: A wire gap film is formed on a flat coplanar surface formed on a bottom pole by a bottom track pole and a thin film coil, first and second magnetic material films constituting a top pole are formed on a flat surface of the thin film coil, and the first and second magnetic material films, write gap film and bottom track pole are partially removed forming a top track pole and trim structure. The thin film coil is formed by first and second thin film coil halves having self-aligned coil windings and have a CVD formed first conductive film, and an electrolytic plating formed second conductive film. A thin insulating film is interposed between successive coil windings of the first and second thin film coil halves. Jumper wirings, formed with the top pole, connect innermost and outermost coil windings of the first and second thin film coil halves respectively.Type: GrantFiled: September 21, 2005Date of Patent: May 1, 2007Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.), Ltd.Inventors: Yoshitaka Sasaki, Takehiro Kamigama
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Patent number: 7210526Abstract: The present invention is a material and method that enables creation of an in situ pumping action within a matrix or otherwise porous media. This pumping action may be used to move materials, namely fluids, through the matrix or porous media to a gathering point. This pumping action may also be used as a vibrational source, using the movement of the matrix itself as the radiator of vibrational, typically acoustic, energy. This vibrational energy may be used for a variety of purposes.Type: GrantFiled: December 7, 2004Date of Patent: May 1, 2007Inventor: Charles Saron Knobloch
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Patent number: 7207099Abstract: A thin-film magnetic head comprises a read head and a write head. The read head and the write head are placed such that a top shield layer of the read head and a bottom pole layer of the write head are opposed to each other. A magnetism intercepting layer is provided between the top shield layer and the bottom pole layer. The magnetism intercepting layer is made of a nonmagnetic metal material that is capable of being formed through plating, such as platinum. The top shield layer, the magnetism intercepting layer and the bottom pole layer are consecutively formed through plating.Type: GrantFiled: February 15, 2005Date of Patent: April 24, 2007Assignee: TDK CorporationInventors: Atsushi Yamaguchi, Shigeru Shoji
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Patent number: 7205020Abstract: A magnetic recording medium has a non-magnetic under-layer, a magnetic layer, a protective film and a liquid lubricant layer sequentially laminated on a non-magnetic substrate. The magnetic layer has a multi-layer structure laminated with two or more magnetic layer components, each of the magnetic layer components having ferromagnetic grains and non-magnetic grain boundaries surrounding the grain. The resulting magnetic recording medium has a granular magnetic layer exhibiting very high Hc accompanying high density of magnetic recording, while decreasing the amount of platinum needed for attaining the high Hc, and reducing media noise accompanying the high recording density.Type: GrantFiled: January 14, 2004Date of Patent: April 17, 2007Assignee: Fuji Electric Co., Ltd.Inventors: Tadaaki Oikawa, Hiroyuki Uwazumi, Takahiro Shimizu, Naoki Takizawa
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Patent number: 7200918Abstract: Embodiments include a slider having a silicon body and at least one carbide pad structure embedded therein. At least one head structure for reading and/or writing data is located on the silicon body. The silicon body includes an air bearing surface on which the head is located. The air bearing surface also includes at least a portion of the carbide pad structure thereon. In one aspect, the metal carbide structure may be made from a material such as titanium carbide, zirconium carbide, vanadium carbide, tungsten carbide, or molybdenum carbide. In another aspect, the head may be located on the air bearing surface between carbide pad structures.Type: GrantFiled: June 20, 2003Date of Patent: April 10, 2007Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventor: Jeffrey S. Lille
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Patent number: 7198817Abstract: A process for producing a magnetic recording medium having at least one magnetic layer formed above a support is provided. The process includes a step of providing, on at least one side of the support, a smoothing coating layer having a thickness of 0.10 to 1 ?m, a surface roughness of at most 5 nm, a number of projections having a height of 20 nm or higher measured by atomic force microscopy (AFM) of at most 20 projections/900 ?m2, and an amount of residual solvent of less than 10 mg/m2, and a step of forming at least one magnetic layer on or above the smoothing coating layer without winding up.Type: GrantFiled: November 18, 2003Date of Patent: April 3, 2007Assignee: Fuji Photo Film Co., Ltd.Inventors: Masatoshi Takahashi, Mikio Tomaru, Hiroshi Hashimoto
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Patent number: 7185416Abstract: A slider comprises a slider section and a reproducing head section. The slider section has a first medium facing surface, an air inflow end, and a recording head. The reproducing head section has a second medium facing surface, an air outflow end, and a reproducing head. The slider section and the reproducing head section are fabricated separately, and bonded to each other so that the first medium facing surface and the second medium facing surface are continuous.Type: GrantFiled: February 11, 2005Date of Patent: March 6, 2007Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.Inventors: Yoshitaka Sasaki, Takehiro Kamigama
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Patent number: 7182974Abstract: A magnetic recording medium having a high coercive force and being capable of high-density writing/reading has a substrate, a soft magnetic layer, a non-magnetic intermediate layer, a magnetic layer, a protective layer, and a lubricating layer. The magnetic layer is characterized by stacking fault density and dispersion of particle diameters. The stacking fault density should preferably be no larger than 0.05, and the dispersion of particle diameters should preferably be no larger than 0.4. The magnetic recording medium has a coercive force larger than 4000 Oe, is highly stable to thermal decay, and has a recording density in excess of 50 Gbit/in2.Type: GrantFiled: February 10, 2004Date of Patent: February 27, 2007Assignee: Hitachi Global Storage Technologies Japan, Ltd.Inventors: Yoshio Takahashi, Kiwamu Tanahashi, Yuzuru Hosoe, Ichiro Tamai
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Patent number: 7178222Abstract: Insulating layers are formed on both sides of a multilayer film, and bias layers are formed in contact with at least portions of both end surfaces of a free magnetic layer. The bias layers are formed so as not to extend to the upper surface of the multilayer film. In this construction, a sensing current from electrode layers appropriately flows through the multilayer film, and a bias magnetic field can be supplied to the free magnetic layer from the bias layers through both side surfaces of the free magnetic layer. Furthermore, the magnetic domain structure of the free magnetic layer can be stabilized to permit an attempt to decrease instability of the reproduced waveform and Barkhausen noise.Type: GrantFiled: September 5, 2003Date of Patent: February 20, 2007Assignee: Alps Electric Co., Ltd.Inventor: Naoya Hasegawa
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Patent number: 7174621Abstract: A thin film magnetic head has coil layer formed in a space surrounded by a lower core layer, a protruding layer and a back gap layer. The top of these layers are planarized to a continuous flat surface. A lower magnetic pole layer, a gap layer, an upper magnetic pole layer and an upper core layer are formed on the flat surface and are precisely formed in a predetermined shape. The track width Tw can also be set to a predetermined dimension by the width of the upper magnetic pole layer at a surface facing the recording medium. Also, the magnetic path can be shortened to improve magnetic properties.Type: GrantFiled: January 27, 2005Date of Patent: February 13, 2007Assignee: Alps Electronic Co., Ltd.Inventors: Kiyoshi Sato, Toshinori Watanabe, Toshihiro Kuriyama
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Patent number: 7172786Abstract: The present invention discloses a method for the production of sub-micron structures on magnetic materials using electron beam lithography. A subtractive process is disclosed wherein a portion of a magnetic material layer is removed from the substrate using conventional lithography, and the remaining portion of the magnetic material layer is patterned by e-beam lithography. A additive process is also disclosed wherein a thin magnetic seed layer is deposited on the substrate, a portion of which is removed by conventional lithography and replaced with a non-magnetic conducting layer. The remaining portion of magnetic seed layer is patterned by e-beam lithography and the final magnetic structure produced by electroplating.Type: GrantFiled: May 14, 2004Date of Patent: February 6, 2007Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Alexander Adrian Girling Driskill-Smith, Hieu Lam, Kim Y. Lee
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Patent number: 7169468Abstract: A resin bonded rare earth magnet, compression molded from rare earth-transition alloy powder and thermosetting resin, having a magnet 1 comprising a mixture of thermosetting resin and rare earth-transition alloy powder with a particle size of between 20 and 300 microns, a filling material 3 with particle size between 0.1 and 15 microns which is used to fill in the depressions 2 on the surface of said magnet 1 and is then fixed with said thermosetting resin, and a corrosion inhibiting coat 4 made from synthetic resin applied to the surface of said magnet 1 which has been rendered smooth by the application of said filling material into the depressions on its surface.Type: GrantFiled: October 18, 1999Date of Patent: January 30, 2007Assignee: Minebea Co., LtdInventors: Toshihiko Miura, Masahito Kawasaki, Shunji Suzuki, Shuichi Nishida