Applying Superposed Diverse Coating Or Coating A Coated Base Patents (Class 427/131)
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Publication number: 20090130492Abstract: Information storage devices and methods of manufacturing the same are provided. An information storage device includes a magnetic layer formed on an underlayer. The underlayer has at least one first region and at least one second region. The first and second regions have different crystallinity characteristics. The magnetic layer has at least one third region formed on the at least one first region and at least one fourth region formed on the at least one second region. The third and fourth regions have different magnetic anisotropic energy constants.Type: ApplicationFiled: May 6, 2008Publication date: May 21, 2009Inventors: Sung-chul Lee, Sun-ae Seo, Young-jin Cho, Chang-won Lee
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Publication number: 20090122449Abstract: A magnetic write head includes a main pole, a return yoke forming a magnetic path with the main pole, a side shield formed at both sides of the main pole, and a shield gap layer formed between the side shield and the return yoke. The side shield and the return yoke have portions connected to each, and are separated from each other by the shield gap layer in an area except for the portions which contact. A first gap layer formed of a nonmagnetic insulation material is formed between both sides of the main pole and the side shield. A gap is formed between an end portion of the main pole and an end portion of the return yoke and a second gap layer is formed in the gap with a nonmagnetic insulation material.Type: ApplicationFiled: July 8, 2008Publication date: May 14, 2009Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Yong-su KIM, Kook-hyun SUNWOO, Kyoung-won NA
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Publication number: 20090117355Abstract: The present invention provides a ferromagnetic/antiferromagnetic coupling film structure and a fabrication method thereof. The structure includes an antiferromagnetic layer of cobalt oxide having a thickness of 2 to 15 monolayers and formed on a substrate at a temperature ranging from 700K to 900K; and a ferromagnetic layer of cobalt having a thickness of at least one monolayer for being formed on the antiferromagnetic layer of cobalt oxide.Type: ApplicationFiled: July 31, 2008Publication date: May 7, 2009Inventors: Jyh-Shen Tsay, Chi-Wei Lee, Gung Chern
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Publication number: 20090117409Abstract: A perpendicular magnetic recording medium and a method of manufacturing the same are provided. The perpendicular magnetic recording medium includes a substrate, and a recording layer comprising a plurality of independent first magnetic body regions and a plurality of second magnetic body regions formed on the substrate, the second magnetic body regions separating the first magnetic body regions from each other, and being formed by implanting dopant into a region in which the first magnetic body regions are to be separated. Each of the first magnetic body regions has an L10 structure and the dopant has an ionic or molecular shape.Type: ApplicationFiled: May 9, 2008Publication date: May 7, 2009Applicant: Samsung Electronics Co., Ltd.Inventors: Hoo-san LEE, Hoon-sang Oh
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Publication number: 20090115405Abstract: An integrated angular magnetic sensor apparatus for determining a magnetic field angle within two axes of a plane is formed on a substrate onto which two anisotropic magneto-resistive sensing elements and at least one magneto-resistive sensing element are fabricated. The two anisotropic magneto-resistive sensing elements are oriented such that the output voltages of a first and second of the anisotropic magneto-resistive sensing elements are a function of a first and second trigonometric function (a sine function) of the magnetic field angle to a reference axis. The at least one magneto-resistive sensing element on the substrate and having a fixed reference magnetization oriented with respect to the reference axis such that an output voltage of the at least one magneto-resistive sensing element provides a quadrant indicator for the magnetic field angle with respect to the reference axis. The quadrant indicator is a trigonometric function such as a sine or cosine function.Type: ApplicationFiled: November 1, 2007Publication date: May 7, 2009Inventors: Yimin Guo, Grace Gorman
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Publication number: 20090104346Abstract: A longitudinal magnetic recording medium comprising at least four magnetic layers including a substrate, a CoCrTa magnetic intermediate layer on the substrate, wherein the CoCrTa magnetic intermediate layer comprises Cr <16 at % and Ta <6 at %, a first CoCrPtB magnetic layer on the CoCrTa layer, wherein the first CoCrPtB magnetic layer comprises Cr: 10-14%, Pt: 4-8 at %, B: 6-10%, a second CoCrPtB magnetic layer on the first CoCrPtB magnetic layer, and a third CoCrPtB magnetic layer on the second CoCrPtB layer, wherein the third CoCrPtB magnetic layer comprises Cr: 12-16 at %, Pt: 12-16 at %, B: 10-14 at % and has <10 at % Cr than that in the second CoCrPtB magnetic layer is disclosed.Type: ApplicationFiled: November 13, 2008Publication date: April 23, 2009Applicant: Seagate Technology LLCInventors: Li-Lien Lee, Michael Z. Wu, Shanghsien S. Rou
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Patent number: 7514118Abstract: A method of plating on a glass substrate allowing an electroless plating film with good adhesiveness to be formed by chemically bonding a silane coupling agent in a state of simple adhesion or hydrogen bond to the surface of the glass substrate through dehydration condensation reaction, and a method of manufacturing a magnetic recording medium using the plating method. In the plating method, electroless plating is performed on a glass substrate after sequentially conducting at least the adhesion layer formation that forms an adhesion layer using a silane coupling agent solution, catalyst layer formation, a catalyst activation, and a drying that chemically bonds the silane coupling agent in the adhesion layer to the surface of the glass substrate.Type: GrantFiled: November 29, 2005Date of Patent: April 7, 2009Assignee: Fuji Electric Device Technology Co., Ltd.Inventors: Akira Iso, Youichi Tei
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Publication number: 20090086372Abstract: Embodiments of the present invention help to provide a discrete track medium for realizing a high track density in a low price by adopting a configuration, in which filling of a non-magnetic material into a guard band portion and smoothing processing of a medium surface are not required. According to one embodiment, a perpendicular magnetic recording medium, on the non-magnetic substrate, includes at least: a soft magnetic underlayer; a first recording layer including a crystal grain having a magnetic property and a non-magnetic grain boundary having an oxide, as a main component, surrounding the crystal grain; a second recording layer containing a ferromagnetic metal as a main component and not containing an oxide; and at least one non-magnetic layer provided between the first recording layer and the second recording layer.Type: ApplicationFiled: September 26, 2008Publication date: April 2, 2009Inventors: Takayuki Ichihara, Masayoshi Shimizu
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Publication number: 20090081483Abstract: A magnetic disk 10 for use in perpendicular magnetic recording, which includes an underlayer 18, a size-reduction promoting layer 20 (nonmagnetic granular layer) of a granular structure, and a magnetic recording layer 22 having a ferromagnetic layer 32 of a granular structure. The size-reduction promoting layer 20 has an inorganic oxide matrix and nonmagnetic metal crystal grains and is disposed between the underlayer 18 and the ferromagnetic layer 32, thereby reducing the size of magnetic crystal grains in the ferromagnetic layer 32.Type: ApplicationFiled: March 20, 2006Publication date: March 26, 2009Applicant: HOYA CORPORATIONInventors: Yoshiaki Sonobe, Teiichiro Umezawa, Kong Kim, Masaki Uemura
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Patent number: 7504135Abstract: A method of fabricating a diffusion barrier using a gas cluster ion beam apparatus is disclosed. The method includes generating a metal-organic gas that includes a metal-organic compound that includes an element of cobalt (Co) or cobalt and iron (CoFe). The metal-organic gas is combined with a carrier gas that is supplied to the gas cluster ion beam apparatus (GCIB). The GCIB processes the carrier gas to form a beam of gas cluster ions that include the metal-organic compound. The beam irradiates an interface surface of a target material (e.g. an IrMn, PtMn, or MnFe antiferromagnetic layer) and at least a portion of the Co or CoFe remains in contact with the interface surface to form a barrier that prevents a diffusion of manganese (Mn).Type: GrantFiled: February 3, 2005Date of Patent: March 17, 2009Assignee: Samsung Electronics Co., LtdInventor: Janice H. Nickel
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Patent number: 7504007Abstract: A thin soft magnetic film combines a high magnetization with an insulating character. The film is formed by nitriding Fe-rich ferromagnetic nanograins immersed in an amorphous substrate. A selective oxidation of the amorphous substrate is then performed. The result is a thin, insulating, soft magnetic film of high magnetization. Many types of integrated circuits can be made which include a component using a membrane incorporating the above-mentioned thin film.Type: GrantFiled: July 25, 2005Date of Patent: March 17, 2009Assignees: STMicroelectronics S.A., Commissariat a L'Energie AtomiqueInventors: Guillaume Bouche, Pascal Ancey, Bernard Viala, Sandrine Couderc
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Publication number: 20090068347Abstract: A method of forming a micromagnetic device including providing a substrate and forming a magnetic core layer over the substrate from a magnetic alloy. The magnetic alloy includes iron, cobalt and phosphorous. A content of the cobalt is in a range of 1.8 to 4.5 atomic percent. A content of the phosphorus is in a range of 20.1 to 30 atomic percent. A content of the iron is substantially a remaining proportion of the magnetic alloy.Type: ApplicationFiled: September 10, 2007Publication date: March 12, 2009Inventors: Ashraf W. Lotfi, Trifon M. Liakopoulos, Robert W. Filas
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Patent number: 7500303Abstract: A read head for a disk drive and a method of fabricating the read head with overlaid lead pads that contact the top surface of the sensor between the hardbias structures to define the electrically active region of the sensor are described. The invention deposits the GMR and lead layers before milling away the unwanted material. A photoresist mask with a hole defining the active area of the sensor is preferably patterned over a layer of DLC that is formed into a mask. A selected portion of the exposed lead material is then removed using the DLC as a mask defining the active region of the sensor. A photoresist mask pad is patterned to define the full sensor width. The excess sensor and lead material exposed around the mask is milled away. The layers for the hardbias structure are deposited.Type: GrantFiled: May 19, 2006Date of Patent: March 10, 2009Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Tsung Yuan Chen, Kuok San Ho, Mustafa Michael Pinarbasi
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Patent number: 7494686Abstract: A method for manufacturing a magnet patch tape to facilitate blood circulation in a restricted area of a human body is provided. The patch tape shows a number of stripes of anisotropic magnet field with 2 to 5 mm width and spaced 1 to 3 mm apart from each other when viewed through a magnetic field viewer.Type: GrantFiled: December 6, 2005Date of Patent: February 24, 2009Inventors: Jung Suk Suh, Kelly Lucas, Yong Ki Chong
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Perpendicular magnetic recording medium, method of manufacturing same, and magnetic recording device
Patent number: 7494726Abstract: A perpendicular medium is disclosed in which an isolation structure of an underlayer is formed using a simple method as in a conventional manufacturing process for a medium of continuous films. The method suppresses dispersion of alignment and reduced magnetic cluster size in a magnetic recording layer. The perpendicular medium exhibits high recording density owing to thin film thickness of the underlayer. A perpendicular magnetic recording medium includes at least an underlayer and a magnetic recording layer sequentially laminated on a nonmagnetic substrate. The underlayer consists of crystal grains and an amorphous grain boundary, and the crystal grain has a shape holding a relation (an area of a bottom region at an initial stage of growth)>(an area of a top region).Type: GrantFiled: July 1, 2005Date of Patent: February 24, 2009Assignee: Fuji Electric Device Technology Co., Ltd.Inventors: Sadayuki Watanabe, Yasushi Sakai -
Publication number: 20090045162Abstract: A thin film magnetic head has a configuration in which a main magnetic pole film having a magnetic pole end portion on a medium opposing surface (ABS) side facing a magnetic disk, a write shield film facing the magnetic pole end portion so as to form a recording gap film on the medium opposing surface side, and a thin film coil wound around at least a part of the write shield film are laminated. Further, the thin film magnetic head has an upper yoke magnetic pole film whose size is larger than that of the main magnetic pole film at a part more distant from the ABS than the recording gap film, and this upper yoke magnetic pole film is bonded to the side of the main magnetic pole film close to the thin film coil. In the upper yoke magnetic pole film, an end portion on the ABS side is retracted in a direction apart from the ABS in accordance with an increase in film thickness which is measured from the surface of the main magnetic pole film.Type: ApplicationFiled: October 16, 2008Publication date: February 19, 2009Applicants: Headway Technologies, Inc., SAE Magnetics (H.K) Ltd.Inventors: Yoshitaka SASAKI, Hiroyuki Itoh, Takehiro Kamigama, Tatsushi Shimizu
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Publication number: 20090047547Abstract: A method for fabricating a patterned disk of a hard disk drive. The method includes forming a layer of magnetic material over a substrate and then forming a sacrificial flash layer over the layer of magnetic material. A co-polymer material is formed over the sacrificial flash layer and then a plurality of magnetic dots separated by a non-magnetic material are formed in the magnetic layer. The flash layer is preferably a FePt material with a non-magnetic Ag or Cu based alloy. Such material not only provides good adhesion between the co-polymer and magnetic layers but also diffuses into the grains of the magnetic material. The diffusion of the non-magnetic flash layer between the grains of the magnetic material reduces magnetic cross-talk and improves the signal to noise ratio of the disk.Type: ApplicationFiled: August 13, 2007Publication date: February 19, 2009Applicant: Samsung Electronics Co., Ltd.Inventors: Sooyoul Hong, Carl(Xiao) Dong Che, Hyung Lee
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Method of manufacturing a magnetic recording medium and the magnetic recording medium formed thereby
Patent number: 7491418Abstract: A method of manufacturing a magnetic recording medium that exhibits high performance and high reliability includes forming a liquid lubricant layer capable of high coverage while retaining a film thickness of 1 nm to 2 nm. The magnetic recording medium includes an underlayer, a magnetic layer, a protective layer, and a liquid lubricant layer sequentially laminated or formed on a substrate. The liquid lubricant layer is formed by coating a liquid lubricant diluted with a solvent on the protective layer to a thickness of at least the surface roughness to form a thick film liquid lubricant layer, pressing a slide member against the surface of the liquid lubricant layer while rotating the medium to adhere the liquid lubricant onto the protective layer, and reducing the thickness of the liquid lubricant layer with a solvent that can dissolve the liquid lubricant to the medium surface.Type: GrantFiled: March 8, 2005Date of Patent: February 17, 2009Assignee: Fuji Electric Device Technology Co., Ltd.Inventor: Makoto Isozaki -
Publication number: 20090042062Abstract: A magnetic recording medium having a substrate, an interlayer and a magnetic layer, the interlayer having at least a first intermediary layer, a second intermediary layer and a third intermediary layer, wherein the first intermediary layer or the third intermediary layer is non-magnetic or magnetic and the second intermediary layer has a hexagonal close pack crystal structure and a property of providing RKKY coupling between the first intermediary layer and the third intermediary layer when the first intermediary layer and the second intermediary layer are magnetic layers is disclosed.Type: ApplicationFiled: July 1, 2008Publication date: February 12, 2009Applicant: SEAGATE TECHNOLOGY LLCInventors: Erol Girt, Alex Rou, John Wang
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Publication number: 20090021868Abstract: A laminated write pole layer for a PMR write head is disclosed in which a plurality of “n” magnetic layers and “n?1” non-magnetic spacers are formed in an alternating fashion on a substrate. The non-magnetic spacers promote exchange decoupling or antiferromagnetic coupling between adjacent magnetic layers. Writability is improved when the trailing magnetic layer has a thickness greater than the thickness of other magnetic layers and preferably >25% of the total thickness of the magnetic layers. The thicknesses of the other magnetic layers may be equal or may become progressively smaller with increasing distance from the trailing magnetic layer. In another embodiment, the non-magnetic spacer between the trailing magnetic layer and the nearest magnetic layer is replaced by a magnetic spacer made of a soft magnetic material to promote magnetic coupling and effectively increase the thickness of the trailing magnetic layer.Type: ApplicationFiled: July 19, 2007Publication date: January 22, 2009Inventors: Kenichi Takano, Lijie Guan, Yuchen Zhou, Joe Smyth, Moris Dovek
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Thin-film magnetic head, method of manufacturing the same, head Gimbal assembly, and hard disk drive
Publication number: 20090017198Abstract: A thin-film magnetic head has a laminated construction comprising a main pole layer having a magnetic pole tip on a side of the medium-opposing surface opposing a recording medium, a write shield layer opposing the magnetic pole tip forming a recording gap layer, on the side of the medium-opposing surface, and a thin-film coil wound around at least a portion of the write shield layer. The thin-film magnetic head has an upper yoke pole layer having a larger size than the portion of the main pole layer which is more distant from the medium-opposing surface than the recording gap layer, wherein the upper yoke pole layer is joined to the side of the main pole layer which is near the thin-film coil.Type: ApplicationFiled: September 10, 2008Publication date: January 15, 2009Applicant: Headway Technologies, Inc.Inventors: Yoshitaka Sasaki, Lijie Guan, Hiroyuki Ito, Dong Hong Li -
Publication number: 20090017518Abstract: A magnetic particle and fabrication method thereof. The magnetic particle comprises a polymer core, a magnetic material layer covering the polymer core, and a silicon containing layer covering the magnetic material layer. In addition, the magnetic particle may further comprise a coupling agent on the silicon containing layer, and an active molecule connected to the coupling agent. The magnetic particles provide controllable size, uniform diameter distribution, high magnetization, improved storage stability, and modified surface for targeting biomolecules for biomaterial separation and environmental analysis.Type: ApplicationFiled: July 11, 2007Publication date: January 15, 2009Inventors: Kun Chan Wu, Hui-Ju Cho, Pei-Shin Jiang, Hsiang Yuan Huang, Wen-Hsun Kuo, Chi-Min Chau
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Patent number: 7476414Abstract: There are provided a magnetoresistance effect element, a magnetic head, a magnetic head assembly and a magnetic recording system, which have high sensitivity and high reliability. The magnetoresistance effect element has two ferromagnetic layers, a non-magnetic layer provided between the ferromagnetic layers, and a layer containing an oxide or nitride as a principal component, wherein the layer containing the oxide or nitride as the principal component contains a magnetic transition metal element which does not bond to oxygen and nitrogen and which is at least one of Co, Fe and Ni.Type: GrantFiled: December 2, 2004Date of Patent: January 13, 2009Assignee: Kabushiki Kaisha ToshibaInventors: Hideaki Fukuzawa, Katsuhiko Koi, Hiromi Fuke, Hiroshi Tomita, Hitoshi Iwasaki, Masashi Sahashi
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Patent number: 7476413Abstract: Techniques for attaining high performance magnetic memory devices are provided. In one aspect, a magnetic memory device comprising one or more free magnetic layers is provided. The one or more free magnetic layers comprise a low magnetization material adapted to have a saturation magnetization of less than or equal to about 600 electromagnetic units per cubic centimeter. The device may be configured such that a ratio of mean switching field associated with an array of non-interacting magnetic memory devices and a standard deviation of the switching field is greater than or equal to about 20. The magnetic memory device may comprise a magnetic random access memory (MRAM) device. A method of producing a magnetic memory device is also provided.Type: GrantFiled: April 19, 2005Date of Patent: January 13, 2009Assignee: International Business Machines CorporationInventor: David W. Abraham
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Publication number: 20090011283Abstract: A perpendicular magnetic recording medium of the embodiments of the invention comprises a substrate, a hcp soft underlayer (SUL), and a magnetic layer, wherein the hcp SUL is adapted to create a [0002] growth orientation in the magnetic layer and to enhance a magnetic head field during writing of data to the magnetic layer; further wherein the perpendicular magnetic recording medium does not contain an interlayer (IL) that is different from the hcp SUL and provides a [0002] growth orientation in the magnetic layer.Type: ApplicationFiled: March 1, 2007Publication date: January 8, 2009Applicant: SEAGATE TECHNOLOGY LLCInventors: Erol Girt, Raj N. Thangaraj
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Publication number: 20090004510Abstract: A substrate for perpendicular magnetic recording medium 2 is provided with a soft magnetic substrate coat 5. On this soft magnetic substrate coat 5, an anticorrosion coat 5 is formed. The anticorrosion coat 6 is preferably formed so as to completely cover the entire soft magnetic substrate coat 5.Type: ApplicationFiled: August 25, 2005Publication date: January 1, 2009Applicant: SHOWA DENKO K.K.Inventor: Masahiro Ohmori
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Publication number: 20080316648Abstract: A disk for a hard disk drive. The disk includes a first magnetic layer and a second magnetic layer. An intermediate layer consisting of cobalt and titanium is located between the first and second intermediate layers. The intermediate layer creates a finer grain size and larger crystalline anisotropy in the second magnetic layer, characteristics that are desirable when used with a perpendicular recording head.Type: ApplicationFiled: June 19, 2007Publication date: December 25, 2008Applicant: Samsung Electronics Co., Ltd.Inventors: Sooyoul Hong, Carl (Xiao) Dong Che
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Publication number: 20080318087Abstract: Provided is a magnetic recording medium which causes a reduction of transition noises and has a high productivity, and a method of manufacture thereof. The method of manufacturing a magnetic recording medium, comprising: fixing a polymerization initiator on a support by microcontact printing, forming a grafted polymer pattern by bringing a compound having a polymerizable unsaturated bond into contact with the polymerization initiator fixed on the support followed by graft polymerization of the compound, and forming a magnetic region by coating, onto the pattern, an alloy-particle-containing liquid which contains alloy particles capable of forming a CuAu pattern or Cu3Au pattern ferromagnetic ordered alloy, and further subjecting the resultant to annealing processing, thereby forming a plurality of magnetic regions physically independent of each other.Type: ApplicationFiled: June 13, 2008Publication date: December 25, 2008Applicant: FUJIFILM CORPORATIONInventors: Yasushi HATTORI, Koichi Kawamura
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Publication number: 20080305366Abstract: A magnetic recording tape configured for increased surface lubricity includes an elongated substrate and a magnetic side disposed on the substrate. The magnetic side includes a magnetic recording layer defining an exposed magnetic recording surface opposite the substrate, and a support layer deposited on the substrate between the substrate and the magnetic recording layer. The support layer includes nano-particles configured to release lubrication to the exposed magnetic recording surface. In this regard, the support layer configures the exposed magnetic recording surface to have a surface lubrication to total lubrication ratio (SL ratio) of greater than about 5%.Type: ApplicationFiled: June 8, 2007Publication date: December 11, 2008Inventors: Meng C. Hsieh, Matthew N. Fraley, Timo E. Mahonen, Larold L. Olson
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Publication number: 20080286612Abstract: There is provided a tunneling magnetic sensing element having an insulating barrier layer composed of Ti—O, a high rate of resistance change (?R/R) compared with the known art, and an interlayer coupling magnetic field Hin lower than that in the known art while low RA is maintained and the coercivity of a free magnetic layer is maintained at a low level comparable to the known art; and a method for producing the tunneling magnetic sensing element. An insulating barrier layer is composed of Ti—O. A free magnetic layer is formed on the insulating barrier layer and has a laminated structure of an enhancing sublayer composed of a CoFe alloy, a Pt sublayer, and a soft magnetic sublayer composed of a NiFe alloy, stacked in that order from the bottom.Type: ApplicationFiled: August 3, 2007Publication date: November 20, 2008Inventors: Masahiko Ishizone, Masamichi Saito, Kazumasa Nishimura, Yosuke Ide, Ryo Nakabayashi, Naoya Hasegawa
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Patent number: 7449255Abstract: A magnetic recording medium for communication with a transducer moving relative to the recording medium along a line of relative transducer motion. The magnetic recording medium has a substrate with a substrate surface, and a seed layer on the substrate surface. The magnetic recording medium also has a soft magnetic underlayer on the seed layer. The soft magnetic underlayer includes a magnetic material having a magnetic moment larger than 1.7 teslas. The soft magnetic underlayer has a texture that provides a magnetic easy axis that has an easy axis alignment parallel to the line of relative transducer motion. A magnetic storage layer is on the soft magnetic underlayer.Type: GrantFiled: August 28, 2003Date of Patent: November 11, 2008Assignee: Seagate Technology LLCInventors: Yukiko Kubota, Duane Clifford Karns, Kurt Warren Wierman
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Publication number: 20080268293Abstract: According to an aspect of an embodiment, a magnetic recording medium includes a soft under layer, a seed layer containing an alloy, placed over the soft under layer, a ruthenium containing layer containing crystalline Ru, directly placed on the seed layer, and a recording layer placed over the ruthenium containing layer. The alloy contains metal atoms bonded to one another with a minimum distance of adjacent atoms. The difference between the minimum distance of the atoms in the alloy and that of the atoms in the crystalline Ru is 2% or less.Type: ApplicationFiled: March 31, 2008Publication date: October 30, 2008Applicant: FUJITSU LIMITEDInventor: Antony Ajan
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Publication number: 20080268288Abstract: Devices based on spinodally decomposed periodic structures and their fabrication techniques.Type: ApplicationFiled: May 10, 2006Publication date: October 30, 2008Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA, a corporation of CaliforniaInventor: Sungho Jin
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Publication number: 20080261081Abstract: Provided is a perpendicular magnetic recording medium and a method of manufacturing the same. The perpendicular magnetic recording medium includes a substrate, a buffer layer formed on the substrate, a soft magnetic underlayer formed on the buffer layer, and a recording layer formed on the soft magnetic underlayer.Type: ApplicationFiled: April 23, 2008Publication date: October 23, 2008Applicant: Samsung Electronics Co., Ltd.Inventors: Hoo-san Lee, Sung-dong Suh, Tae-sang Park, Hoon-sang Ho
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Publication number: 20080260942Abstract: A grain diameter controlling crystalline layer comprising crystalline grains of a metal selected from the group consisting essentially of Cu, Ni, Rh and Pt was formed on a substrate. Then, deposited atom layer of at least one element selected from the group consisting of oxygen and carbon was formed on the surface of the grain diameter control layer. A magnetic recording layer was deposited on the atoms deposited grain diameter controlling crystalline layer. Then a magnetic recording medium in which the magnetic crystalline grains has small grain diameter and small grain diameter distribution, and the magnetic recording medium shows increased signal to noise ratio at high recording density.Type: ApplicationFiled: October 19, 2007Publication date: October 23, 2008Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tomoyuki MAEDA, Akira KIKITSU, Soichi OIKAWA, Takeshi IWASAKI
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Publication number: 20080260943Abstract: The conventional free layer in a CPP GMR or TMR read head has been replaced by a tri-layer laminate comprising Co rich CoFe, moderately Fe rich NiFe, and heavily Fe rich NiFe. The result is an improved device that has a higher MR ratio than prior art devices, while still maintaining free layer softness and acceptable magnetostriction. A process for manufacturing the device is described.Type: ApplicationFiled: June 19, 2008Publication date: October 23, 2008Inventors: Hui-Chuan Wang, Min Li, Tong Zhao, Kunliang Zhang, Chyu-Jiuh Torng
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Patent number: 7438946Abstract: A ferrite film is formed by regularly arranging constituents such as magnetized grains or one analogous to that. In the ferrite film, the constituents have at least one of the uniaxial anisotropy and the multiaxial anisotropy. The ferrite film has the magnetic anisotropy or the magnetic isotropy. The ferrite film is formed by the use of the plating method in the presence of a magnetic field. Furthermore, an electromagnetic noise suppressor includes the ferrite film.Type: GrantFiled: December 6, 2006Date of Patent: October 21, 2008Assignee: NEC TOKIN CorporationInventors: Koichi Kondo, Okikuni Takahata, Tatsuya Chiba, Hiroshi Ono, Shigeyoshi Yoshida, Masanori Abe, Masahiro Yamaguchi
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Patent number: 7431961Abstract: In this invention, we replace low resistivity NiFe with high-resistivity FeNi for the FL2 portion of a composite free layer in a CIP GMR sensor in order to minimize current shunting effects while still retaining both magnetic softness and low magnetostriction. A process for manufacturing the device is also described.Type: GrantFiled: December 10, 2004Date of Patent: October 7, 2008Assignee: Headway Technologies, Inc.Inventors: Tong Zhao, Hui-Chuan Wang, Yun-Fei Li, Chyu-Jiuh Torng
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Publication number: 20080241600Abstract: The present invention provides a magnetic recording medium wherein a fine non-magnetic inorganic powder, the dispersibility of which is improved, is used to improve the surface smoothness of a lower non-magnetic layer, thereby giving an excellent surface smoothness of an upper magnetic layer and electromagnetic conversion property; and a production process thereof. A magnetic recording medium comprising at least a non-magnetic support, a lower non-magnetic layer on one surface of the non-magnetic support, and an upper magnetic layer on the lower non-magnetic layer, wherein the upper magnetic layer contains at least a ferromagnetic powder, and a binder resin material, and the lower non-magnetic layer contains at least carbon black, iron oxide, and a binder resin material, and the iron oxide has an average major axis length of 30 to 100 nm, and a specific surface area based on the BET method of 80 to 120 m2/g, and the iron oxide contains moisture in an amount per unit specific surface area of 0.13 to 0.Type: ApplicationFiled: March 27, 2008Publication date: October 2, 2008Applicant: TDK CorporationInventors: Hiroyuki Tanaka, Tsutomu Ide, Osamu Inoue
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Publication number: 20080236481Abstract: Lubricant coatings are applied as lubricant vapor to magnetic disks in a lubricant vapor flow path between the disks and a reservoir for liquid lubricant that is heated to the vapor. The flow path includes a vapor chamber between the reservoir and an apertured diffuser. Plural piezoelectric crystals selectively, at different times, monitor the flow rate of lubricant vapor flowing in the vapor chamber, a result achieved by selectively positioning a shutter that is selectively opened and closed between the vapor flowing in the vapor chamber and the crystals. Temperature variations of the crystals are compensated by a feedback arrangement for maintaining the crystal temperature constant.Type: ApplicationFiled: March 29, 2007Publication date: October 2, 2008Applicant: INTEVAC CORPORATIONInventors: Carl PETERSEN, Kenneth D. AMES
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Publication number: 20080220157Abstract: A perpendicular magnetic recording medium is disclosed in which each magnetic crystal grain in the magnetic recording layer has a multilayer structure and has a configuration like a truncated cone shape, in which the crystal grain of the final layer deposited in the film surface side at the final stage is smaller than the diameter of the crystal grain in the initial layer deposited on the substrate side at the initial stage. The invention improves S/N (signal output to noise ratio) by enhancing signal output and reducing noises. The medium is produced by a simple manufacturing method suitable for mass production, and provides a medium of high recording density by improving recording resolution.Type: ApplicationFiled: May 20, 2008Publication date: September 11, 2008Applicant: Fuji Electric Device Technology Co., Ltd.Inventors: Shunji Takenoiri, Yasushi Sakai
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Publication number: 20080218906Abstract: A magnetic recording medium is disclosed in which there is no degradation of magnetic characteristics at the time of manufacture, such as is seen in proposed discrete-track media or patterned media. The medium can be manufactured by a simple method and results in excellent productivity. Magnetic recording media have a substrate, and, provided thereon in order from the substrate side, are a soft magnetic layer, a crystal orientation control layer, and a magnetic recording layer. The area of at least a portion of the crystal orientation control layer is provided with a depressed portion. Portions of the magnetic layer formed on this depressed portion have a non-granular structure, whereas portions of the magnetic formed on the crystal orientation control layer outside the depressed portion have a granular structure.Type: ApplicationFiled: March 4, 2008Publication date: September 11, 2008Applicant: FUJI ELECTRIC DEVICE TECHNOLOGY CO., LTD.Inventor: Shinji UCHIDA
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Patent number: 7422912Abstract: In one embodiment, a memory device includes a plurality of magnetic data cells and a magnetic reference cell extending uninterrupted along more than one of the plurality of data cells.Type: GrantFiled: December 23, 2004Date of Patent: September 9, 2008Assignee: Samsung Electronics Co., Ltd.Inventors: Thomas C. Anthony, Judy Bloomquist, legal representative, Manoj K. Bhattacharyya, Darrel R. Bloomquist
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Publication number: 20080204937Abstract: This magnetic recording medium comprising at least a non-magnetic underlayer on a non-magnetic substrate, a first recording magnetic layer on the non-magnetic underlayer, a second recording magnetic layer on the first recording magnetic layer, and a third recording magnetic layer on the second recording magnetic layer. The first recording magnetic layer, the second recording magnetic layer and the third recording magnetic layer are made of a CoCrPtB alloy. The second recording magnetic layer has a smaller Cr content and a greater B content than the first recording magnetic layer, and the third recording magnetic layer has a smaller Cr content and a greater B content than the first recording magnetic layer and a smaller Pt content than the second recording magnetic layer. The magnetic recording medium according to the present invention can obtain high output medium characteristic with low noise and excellent written performance.Type: ApplicationFiled: December 18, 2007Publication date: August 28, 2008Applicant: Fujitsu limitedInventors: Yuuki Yoshida, Jun Taguchi, Kazuhisa Shida, Noriyuki Asakura, Akira Kikuchi
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Publication number: 20080206601Abstract: A perpendicular magnetic recording medium includes a substrate, a first underlayer formed over the substrate and formed of ruthenium or a ruthenium alloy with crystal grains growing approximately perpendicular to the substrate and isolated from one another in an in-plane direction by a first air gap, a recording layer placed over the first underlayer and formed of magnetic crystal grains growing approximately perpendicular to the substrate and isolated one another in the in-plane direction by a second air gap, and a grain size dispersion preventing layer inserted between the recording layer and the first underlayer, the grain size dispersion preventing layer including crystal grains of a cobalt-based alloy growing approximately perpendicular to the substrate and an oxide isolating the crystal grains of the cobalt-based alloy from one another in the in-plane direction.Type: ApplicationFiled: February 8, 2008Publication date: August 28, 2008Applicant: FUJITSU LIMITEDInventor: Ryoichi Mukai
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Publication number: 20080182015Abstract: Magnetic tunnel junctions are constructed from a MgO or Mg—ZnO tunnel barrier and amorphous magnetic layers in proximity with, and on respective sides of, the tunnel barrier. The amorphous magnetic layer preferably includes Co and at least one additional element selected to make the layer amorphous, such as boron. Magnetic tunnel junctions formed from the amorphous magnetic layers and the tunnel barrier have tunneling magnetoresistance values of up to 200% or more.Type: ApplicationFiled: October 30, 2007Publication date: July 31, 2008Applicant: International Business Machines CorporationInventor: Stuart Stephen Papworth Parkin
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Publication number: 20080171234Abstract: According to an aspect of an embodiment, a recording medium comprises: a recording layer having a surface uneven, for recording information; a fixed lubricant layer disposed on the recording layer, the fixed lubricant layer being arranged so as to cover the surface and having a flat surface; and a fluid lubricant layer laminated on the fixed lubricant layer, the fluid lubricant layer having fluidity.Type: ApplicationFiled: December 19, 2007Publication date: July 17, 2008Applicant: Fujitsu LimitedInventor: Takahiro Imamura
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Publication number: 20080166596Abstract: A Re-based alloy material comprises >50 at. % Re and at least one alloying material selected from grain size refinement elements X which have an atomic radius larger or smaller than that of Re and a solid solubility <˜6 at. % in hcp Re at room or higher temperatures, and lattice matching elements Y which have an atomic radius larger or smaller than that of Re and form a solid solution in hcp Re at room or higher temperatures. The alloy material may further comprise at least one material selected from the group consisting of oxides, nitrides, and carbides. Targets comprising the Re-based alloy material are useful in sputter deposition of improved interlayers for obtaining optimally structured granular perpendicular magnetic recording layers.Type: ApplicationFiled: October 23, 2007Publication date: July 10, 2008Applicant: HERAEUS INC.Inventors: Anirban DAS, Michael Gene Racine, Makoto Imakawa, Steven Roger Kennedy, Rikhit Arora
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Publication number: 20080166597Abstract: A magnetic recording medium is provided which is capable of higher recording density and has a higher coercive force and a lower noise. A production method of the magnetic recording medium, and a magnetic recording and reproducing apparatus are also provided. The magnetic recording medium comprises at least a nonmagnetic undercoat layer, a nonmagnetic intermediate layer, a magnetic layer, and a protective layer, which are laminated in this order on a nonmagnetic substrate, and at least one of the layers of the nonmagnetic undercoat layer is made of a WV alloy or a MoV alloy.Type: ApplicationFiled: October 25, 2005Publication date: July 10, 2008Applicant: SHOWA DENKO K.K.Inventor: Hiroshi Osawa
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Publication number: 20080157910Abstract: On-die inductively coupled wires and a method of making on-die inductively coupled wires are described. The on-die inductively coupled wires include a first wire to carry a first current, a surface area bounded by a second wire, and, an amorphous soft magnetic layer to couple magnetic flux induced by the first current through the surface area.Type: ApplicationFiled: December 29, 2006Publication date: July 3, 2008Inventors: Chang-Min Park, Arnel M. Fajardo