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| Number | Title | Issue Date |
| 8124255 | Magnetic recording medium and magnetic recording and reproducing apparatus A highly reliable magnetic recording medium is provided which has a recording layer formed in a concavo-convex pattern and wherein the recording layer is unlikely to cause a change in magnetic properties. The magnetic recording medium includes a substrate, a recordi... | 02/28/2012 |
| 8039133 | Magnetic recording medium and method for manufacturing the same A magnetic recording medium, and method of manufacturing the same, is provided with excellent recording performance by employing a granular magnetic layer having a specified composition. A magnetic recording medium according to the present invention comprises a nonm... | 10/18/2011 |
| 7998607 | Partially-oxidized cap layer for hard disk drive magnetic media A perpendicular recording magnetic media with a partially-oxidized cap layer combines a second oxide layer with a first cap layer to form the singular, partially-oxidized cap. The oxidized portion and the non-oxidized portion of the partially-oxidized layer are sput... | 08/16/2011 |
| 7879469 | Ferrite magnet powder, sintered magnet, bond magnet, and magnetic recording medium A ferrite magnet powder is represented by the composition formula AFe2+a(1-x)MaxFe3+bO27, wherein A represents at least one element selected from the group consisting of Sr, Ba, and Pb; and M represen... | 02/01/2011 |
| 7879470 | Apparatus, system, and method for the selection of perpendicular media segregant materials A method for improving magnetic grain segregation in perpendicular recording media includes providing a substrate comprising a rigid support structure, depositing a soft underlayer on top of the substrate depositing an intermediate layer on top of the soft underlaye... | 02/01/2011 |
| 7875373 | Perpendicular magnetic recording medium and magnetic storage apparatus using the same Embodiments in accordance with the present invention help to obtain a perpendicular magnetic recording medium having a granular structure, excellent recording/reproducing properties, and excellent durability. According to one embodiment, a recording layer includes a... | 01/25/2011 |
| 7781082 | Magnetic material A magnetic material is provided that has an iron oxide phase whose principal phase is a crystal of a structure which has the same space group as ε-Fe2O3 crystal and in which Al is substituted for a portion of the Fe sites of the ε-Fe2 | 08/24/2010 |
| 7781081 | Magnetic recording medium, manufacturing method for the magnetic recording medium, and magnetic read/write apparatus A magnetic recording medium 62 wherein a substrate 11, undercoating layers 13 and 14 formed on the substrate 11, and a magnetic recording layer 15, which include the magnetic crystal grain and the grain boundary field which ... | 08/24/2010 |
| 7651795 | Perpendicular magnetic recording medium and manufacturing of the same Embodiments of the embodiment are directed to reducing the inter-granular exchange coupling of an oxide granular medium and obtaining a high media S/N value, resulting in an areal recording density greater than 23 gigabits per square centimeter or more being achieve... | 01/26/2010 |
| 7625646 | Perpendicular magnetic recording medium and method of manufacturing it Disclosed are a perpendicular magnetic recording medium with lower medium noise, insusceptible to thermal fluctuation and high recording resolution and a method of manufacturing it. As the step of forming a metal layer at the time of forming a recording layer on a n... | 12/01/2009 |
| 7601445 | Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus To make possible high density recording by making the structure of the perpendicular magnetic recording layer finer. A perpendicular magnetic recording medium 10 includes at least a nonmagnetic under layer 2, a perpendicular magnetic layer 3, an... | 10/13/2009 |
| 7482071 | Perpendicular magnetic recording disk with improved recording layer having high oxygen content A perpendicular magnetic recording disk has an improved recording layer of a granular CoPtCr-based ferromagnetic alloy with inter-granular material made up of one or more oxides of Cr and one or more oxides of one or more of a segregant of Si, Ta, Ti, B, Nb or Hf, w... | 01/27/2009 |
| 7429427 | Granular magnetic recording media with improved grain segregation and corrosion resistance Disclosed are granular magnetic recording media with improved grain segregation and corrosion resistance, comprising a non-magnetic substrate and at least one granular magnetic recording layer formed over the surface, comprised of at least one ferromagnetic material... | 09/30/2008 |
| 7348591 | Switch element, memory element and magnetoresistive effect element A switch element includes a substrate; a plurality of carbon nanotubes provided upright on the substrate; magnetic particles arranged at tip ends of the carbon nanotubes respectively; and a plurality of conductive layers formed between base ends of the carbon nanotu... | 03/25/2008 |
| 7311983 | Perpendicular magnetic recording medium and a method for manufacturing the same A perpendicular magnetic recording medium has a magnetic recording layer and laminated magnetic layers composed of different materials. In a first magnetic layer of the magnetic recording layer, ferromagnetic grains are surrounded by a nonmagnetic grain boundary reg... | 12/25/2007 |
| 7241471 | Magnetic recording medium and method of fabricating the same 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 pr... | 07/10/2007 |
| 7241518 | Magnetic recording medium and method of manufacturing a magnetic recording medium It is a magnetic recording medium for which favorable values for all of reproduced output, noise level and error rate can be obtained, and which is also superior in terms of storage stability. A magnetic recording medium (10), which has a configuration in whi... | 07/10/2007 |
| 7241519 | Magnetic recording medium with columar magnetic layer Provided is a magnetic recording medium capable of achieving higher density recording. The magnetic recording medium comprises a magnetic layer formed on a non-magnetic base through vacuum oblique evaporation. The magnetic layer includes a plurality of columns in wh... | 07/10/2007 |
| 7236327 | Information storage medium and apparatus adopting the same An information storage medium and an apparatus adopting the information storage medium. The information storage medium includes: a substrate; a lower magnetic layer formed on the substrate; and an upper magnetic layer, the upper magnetic layer includes an alumina la... | 06/26/2007 |
| 7192664 | Magnetic alloy containing TiOfor perpendicular magnetic recording application The SMNR of a granular perpendicular recording medium is significantly enhanced by incorporating TiO2 at the grain boundaries of the magnetic alloy layer. Embodiments include granular perpendicular recording media comprising CoPt alloys containing 0.1 to ... | 03/20/2007 |
| 7160636 | Ferrite thin film, method of manufacturing the same and electromagnetic noise suppressor using the same 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 aniso... | 01/09/2007 |
| 7149045 | Longitudinal media with soft underlayer and perpendicular write head A magnetic recording device including a longitudinal magnetic recording medium. The longitudinal magnetic recording medium includes a magnetically soft underlayer disposed under a longitudinal recording layer. A perpendicular write head is utilized to write data to ... | 12/12/2006 |
| 7144642 | Permanent magnet and method for preparation thereof A ferrite magnet obtained by adding a ferrite having a hexagonal W-type magnetoplumbite structure to a ferrite having a hexagonal M-type magnetoplumbite structure, in which a portion of Sr, Ba, Pb or Ca is replaced with at least one element that is selected from the... | 12/05/2006 |
| 7141316 | Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus Disclosed is a perpendicular magnetic recording medium in which an undercoating layer having crystal grains and a grain boundary material containing a carbide or boride is formed below a perpendicular magnetic recording layer, and another undercoating layer containi... | 11/28/2006 |
| 7132176 | Perpendicular magnetic recording medium and magnetic recording/reproduction apparatus A perpendicular magnetic recording medium includes a magnetic recording layer stacked on a substrate and having a first perpendicular magnetic recording layer containing cobalt, and a second perpendicular magnetic recording layer mainly containing a crystalline allo... | 11/07/2006 |
| 7112375 | Seed layer structure for improved crystallographic orientation of a hard magnetic material A seed layer structure for improved crystallographic orientation of grains in a hard magnetic material is disclosed. The seed layer structure is comprised of alternating layers of a metal and a dielectric. Hard magnetic materials deposited on the seed layer structur... | 09/26/2006 |
| 7081268 | In-situ post-deposition oxidation treatment for improved magnetic recording media A method of manufacturing a magnetic recording medium comprises sequential steps of: (a) providing an apparatus for manufacturing the medium; (b) supplying the apparatus with a substrate for the medium; ... | 07/25/2006 |
| 7035138 | Magnetic random access memory having perpendicular magnetic films switched by magnetic fields from a plurality of directions A magnetization reversal method is a method of applying an external magnetic field to a magnetoresistive film, in which the magnetoresistive film has a structure wherein a nonmagnetic film is placed between magnetic films with an easy axis of magnetization along a p... | 04/25/2006 |
| 6696172 | Recording medium and method for manufacturing the same A magnetic recording medium has at least a non-magnetic under-layer, a magnetic layer, a protective layer and a liquid lubricant layer sequentially laminated on a non-magnetic substrate. The magnetic layer includes ferromagnetic grains and non-magnetic gr... | 02/24/2004 |
| 5503943 | Magnetic recording medium A metal thin film magnetic recording medium having improved S/N and reduced noise is disclosed, which has a ferromagnetic metal thin film composed mainly of Co on a non-magnetic support, characterized in that the crystallite size as determined from the th... | 04/02/1996 |
| 5496620 | Magnetic recording medium A medium in which a magnetic layer is composed mainly of Co and oxygen and has a principal axis of magnetic anisotropy rising unidirectionally at 20° to 80° to a nonmagnetic substrate surface, the coercive force Hs on the surface side of the magnetic la... | 03/05/1996 |
| 5496631 | Perpendicular magnetic film, multilayered film for perpendicular magnetic film and process for producing perpendicular magnetic film Disclosed herein is a perpendicular magnetic film comprising a spinel thin film which is formed on a substrate, which contains Fe as the main ingredient and further contains Co and Ni, and which has a coercive force of less than 3000 Oe, the plane (400) t... | 03/05/1996 |
| 5492774 | Perpendicular magnetic recording medium and process for production of the same A perpendicular magnetic recording medium having a magnetic layer comprised of a metal magnetic thin film on a nonmagnetic support. The half-value width of the switching field distribution obtained from a remanent magnetization curve in the intrinsic easy... | 02/20/1996 |
| 5492775 | Barium ferrite thin film for longitudinal recording A high-density recording media comprising longitudinally oriented polycrystalline barium ferrite exhibits large coercivity, corrosion resistance, high hardness and durability. Films are prepared by on-axis sputtering at ambient temperatures from stoichiom... | 02/20/1996 |
| 5244751 | Perpendicular magnetic recording medium, its fabrication method and read-write machine using it There is disclosed a perpendicular magnetic recording medium having a magnetic layer comprising magnetic metal corpuscles and their oxide formed on a nonmagnetic substrate, and having perpendicular magnetic recording read-write characteristics improved by... | 09/14/1993 |
| 5094897 | Magnetic recording medium comprising a glass substrate and a gamma Fe23 magnetic thin film with specified X-ray diffraction and surface roughness A magnetic recording disk comprising a rigid substrate and a magnetic layer of the continuous thin film type is durable and exhibits good electromagnetic properties when the magnetic layer predominantly composed of γ-Fe2 O3 has spec... | 03/10/1992 |
| 5094898 | Magnetic recording medium comprising a glass substrate of controlled surface roughness and a magnetic thin film layer of gamma Fe2 O3 A magnetic recording disk comprising a rigid substrate and a magnetic layer of the continuous thin film type predominantly composed of γ-Fe2 O3 shows high durability, especially CSS durability when the magnetic layer has specific pe... | 03/10/1992 |
| 5073449 | Magnetic recording medium and method for producing the same A magnetic recording medium comprising a substrate and a ferromagnetic metal layer, wherein the ferromagnetic metal layer includes hydrated amorphous cobalt oxide, a X-ray photoelectron spectra which is characterized in that, in the Co2p spectr... | 12/17/1991 |
| 5068152 | Magnetic recording medium A magnetic recording medium comprising a non-magnetic substrate and a magnetic layer composed of a ferromagnetic material having a face-centered cubic structure and at least one of a carbon, silicon, a hydrocarbon compound and an organosilicone compound, ... | 11/26/1991 |
| 5062938 | High coercivity low noise cobalt alloy magnetic recording medium and its manufacturing process A cobalt alloy disk for horizontal magnetic recording has both high coercivity and low noise at high recording density. The magnetic layer in the disk contains, in addition to the cobalt alloy material, an oxide of one or more "impurity" elements which ha... | 11/05/1991 |
