WD MEDIA (SINGAPORE) PTE. LTD. Patent applications |
Patent application number | Title | Published |
20140044992 | PERPENDICULAR MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING PERPENDICULAR MAGNETIC RECORDING MEDIUM - A perpendicular magnetic recording medium | 02-13-2014 |
20130216865 | MAGNETIC RECORDING MEDIUM AND MANUFACTURING METHOD OF THE SAME - A magnetic recording medium enabling excellent magnetic recording reproduction characteristics to be exhibited with the spacing loss reduced. The magnetic recording medium has a magnetic recording layer of a granular structure having nonmagnetic boundary portions between pillar-shaped magnetic particles on a nonmagnetic substrate, and an exchange coupling layer provided on the magnetic recording layer to add an action of exchange coupling the magnetic particles. Ion irradiation on the entire surface of the exchange coupling layer after layering the exchange coupling layer on the magnetic recording layer is performed | 08-22-2013 |
20130040167 | PERPENDICULAR MAGNETIC RECORDING MEDIUM AND ITS MANUFACTURING METHOD - It is aimed to provide a perpendicular magnetic recording medium capable of dealing with an ultra-higher recording density than before and its manufacturing method. | 02-14-2013 |
20120276417 | LUBRICANT FOR MAGNETIC DISK AND MAGNETIC DISK - A lubricant for a magnetic disk that is excellent in heat resistance and is suitably used in a magnetic disk to be mounted on a magnetic recording device of a thermally assisted magnetic recording system and a magnetic disk provided with a lubricant layer containing this lubricant. The lubricant for a magnetic disk contains a compound where perfluoropolyether groups each having a perfluoropolyether main chain in its structure and a phosphazene ring at an end are linked to each other through a linking group. The linking group is an aliphatic group or a phosphazene ring. In a magnetic disk having at least a magnetic recording layer, a protective layer, and a lubricant layer on a substrate, the lubricant layer contains the lubricant for a magnetic disk. | 11-01-2012 |
20120225217 | METHOD OF PRODUCING A MAGNETIC RECORDING DISC - A method of manufacturing a magnetic disk in which at least a magnetic layer, a carbon protective layer, and a lubrication layer are sequentially formed on a substrate is provided. The method comprises forming a film of a lubricant composition on the protective layer, the lubricant comprising a lubricant compound having a perfluoropolyether main chain in the molecular structure and an aromatic group or a phosphazene ring. The method further comprises forming the lubrication layer, and subjecting the magnetic disk to ultraviolet irradiation under a nitrogen gas or an inert gas atmosphere having an oxygen concentration of 5 volume % or less by adjusting an atmospheric temperature to a range of 50 to 180° C. | 09-06-2012 |
20120207919 | Method of Manufacturing a Perpendicular Magnetic Disc - A method of manufacturing a perpendicular magnetic disk comprises forming, on a base, a film of a first ground layer made of Ru or a Ru alloy at a first pressure, forming, on the first ground layer, a film of a second ground layer made of Ru or a Ru alloy at a second pressure higher than a first pressure, forming, on the second ground layer, a film of a third ground layer having Ru or a Ru alloy as a main component and an oxide as an accessory component at a third pressure higher than the first pressure and lower than the second pressure, and forming, on a layer above the third ground layer, a film of a granular magnetic layer in which a non-magnetic substance having an oxide is segregated around magnetic particles having an CoCrPt alloy grown in a columnar shape to form a grain boundary. | 08-16-2012 |
20120194936 | EVALUATION METHOD OF PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MANUFACTURING METHOD OF PERPENDICULAR MAGNETIC RECORDING MEDIUM - A characteristic evaluation method of a perpendicular magnetic recording medium suitable for obtaining a perpendicular magnetic recording medium which can respond to much higher recording density is provided. | 08-02-2012 |
20120189872 | Perpendicular Magnetic Recording Disc - A perpendicular magnetic disk is provided. The disk includes, on a base and in the order from bottom, a first granular magnetic layer group including a plurality of magnetic layers each having a granular structure, a non-magnetic layer having Ru or a Ru alloy as a main component, a second granular magnetic layer group including a plurality of magnetic layers each having the granular structure, and an auxiliary recording layer having a CoCrPtRu alloy as a main component. Layers closer to a front surface among the plurality of magnetic layers included in the first granular magnetic layer group having an equal or smaller content of Pt. Layers closer to the front surface among the plurality of magnetic layers included in the second granular magnetic layer group having an equal or smaller content of Pt and having an equal or larger content of an oxide. | 07-26-2012 |
20120175243 | Method of producing a perpendicular magnetic recording medium - To provide a method for manufacturing a perpendicular magnetic recording medium which has improved electromagnetic conversion characteristics, and thus making it possible to achieve the much higher recording density. | 07-12-2012 |
20120171369 | METHOD FOR PRODUCING A PERPENDICULAR MAGNETIC RECORDING MEDIUM - To provide a method for manufacturing a perpendicular magnetic recording medium, which is capable of coping with the much higher recording density. | 07-05-2012 |
20120170152 | MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM MANUFACTURING METHOD - [Problem] An object is to provide a magnetic recording medium with improved HDI characteristics, such as impact resistance, and its manufacturing method. | 07-05-2012 |
20120164488 | PERPENDICULAR MAGNETIC RECORDING MEDIA AND METHODS FOR PRODUCING THE SAME - [Problem] An object is to provide a perpendicular magnetic recording medium that can realize both improvement in crystal orientation and refinement of crystal grain size and can achieve a higher recording density and a higher SN ratio, and a method of manufacturing the same. | 06-28-2012 |
20120162808 | Perpendicular magnetic recording media and magnetic disc apparatus - [Problem] A perpendicular magnetic recording medium and a magnetic disk device that are suitable for a shingle recording type are provided. | 06-28-2012 |
20120156523 | Perpendicular Magnetic Recording Medium And Method Of Manufacturing Same | 06-21-2012 |
20120148875 | LUBRICANT FOR MAGNETIC DISC, MAGNETIC DISC AND METHOD OF PRODUCING THE SAME - A magnetic disk with which further reduction of magnetic spacing can be realized and which has high reliability under such circumstances of a lower floating amount of a magnetic head involved in the recent rapid increase in recording density and of extremely severe environmental resistance involved in diversification in use applications is provided. | 06-14-2012 |
20120141835 | Perpendicular Magnetic Recording Disk - [Problem] A perpendicular magnetic disk with an improved SNR and increased recording density by further advancing microfabrication and uniformalization of particle diameters and improving crystal orientation regarding a preliminary ground layer made of a Ni-base alloy is provided. | 06-07-2012 |
20120141833 | Perpendicular Magnetic Recording Disc - [Problem] A perpendicular magnetic disk with an improved SNR and an increased recording density by further improving crystal orientation of a preliminary ground layer formed of an Ni-base alloy is provided. | 06-07-2012 |
20120140359 | Perpendicular Magnetic Recording Media | 06-07-2012 |
20120129009 | Perpendicular Magnetic Recording Disc | 05-24-2012 |
20120127601 | LUBRICANT COMPOUND FOR MAGNETIC DISK AND MAGNETIC DISK - A lubricant compound for a magnetic disk is provided which can realize further reduction of the magnetic spacing and moreover, has high reliability under a lower floating amount of the magnetic head involved with the recent rapid increase in the recording density and under extremely severe environmental resistance involved with diversification of the applications. | 05-24-2012 |
20120127599 | MAGNETIC DISK AND MANUFACTURING METHOD THEREOF - A magnetic disk is provided which is excellent in durability of the magnetic disk or particularly in LUL durability and CFT characteristics and has high reliability under a decreased floating amount of the magnetic head accompanying the recent rapid increase in a recording density and extremely severe environmental resistance accompanying diversification of the applications. | 05-24-2012 |
20120077060 | EVALUATION METHOD OF MAGNETIC DISK, MANUFACTURING METHOD OF MAGNETIC DISK, AND MAGNETIC DISK - An evaluation method that can easily evaluate properties of a carbon protective film and a lubricant on a magnetic-disk surface or particularly, an evaluation method of a magnetic disk in which the properties of the magnetic-disk surface can be evaluated accurately so that a strict demand for interactions between the magnetic-disk surface and a head can be met is provided. In a state in which an element portion of the magnetic head provided with the head element portion that projects by thermal expansion is projected, after being brought into contact with a predetermined radial position on the surface of the rotating magnetic disk, the head is further made to perform seeking in a state in which the element portion is projected by a specified amount, whereby the properties of the carbon film or the lubricant formed on the magnetic-disk surface is evaluated. | 03-29-2012 |
20120075740 | Thermally Assisted Magnetic Recording Disk, Manufacturing Method Thereof, And Magnetic Recording Method - The invention provides a magnetic disk that solves (1) a problem of cross-talk that cannot be solved even by an existing thermally assisted recording method or a discrete method (DTM or the like), (2) a problem of surface flatness, which an existing embedding type DTM or the like has, and (3) a problem of a difference in thermal expansion coefficient between materials when a thermally assisted method is applied to the DTM, and that (4) does not necessitate a special medium structure, and is excellent in a surface flatness and economically and functionally high in realizability. A DTM manufactured by ion implantation is excellent in the surface flatness, and can solve the cross-talk problem by conducting the thermally assisted recording at a temperature between a Curie temperature (Tcn) of a portion where ions are implanted (non-recording region) and a Curie temperature (Tcr) of a portion where ions are not implanted (recording region). | 03-29-2012 |
20120070692 | Perpendicular Magnetic Disc - [Problem] To make a film thinner while keeping a function as an auxiliary recording layer, and improve an SNR and an overwrite characteristic. | 03-22-2012 |
20120069466 | APPARATUS OF MAGNETIC DISC - An object of the present invention is to further improve a recording density in a magnetic disk apparatus using a shingle write system. | 03-22-2012 |
20120066896 | METHOD OF PRODUCING A PERPENDICULAR MAGNETIC DISC - An object of the invention is to achieve thinning while maintaining a function required for an auxiliary recording layer, thereby achieving improvement of SNR. | 03-22-2012 |
20110311841 | MAGNETIC DISK AND METHOD FOR MANUFACTURING SAME - Provided are a magnetic disk comprising a granular magnetic recording layer which causes less noise even with a recording capacity thereof of 250 G or more bits per square inch; and a method for manufacturing the same. The magnetic disk according to the present invention comprises: a granular magnetic recording layer ( | 12-22-2011 |
20110299194 | METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM, AND MAGNETIC RECORDING MEDIUM - [Problem] The concentration distribution in a perpendicular direction of ions implanted in a magnetic recording layer of a perpendicular magnetic recording medium is made a suitable one corresponding to a layer implanted with ions. | 12-08-2011 |
20110268990 | PERPENDICULAR MAGNETIC DISC - An object of the present invention is to achieve thinning of an auxiliary recording layer while maintaining the function thereof to improve SNR. | 11-03-2011 |
20110244119 | PERPENDICULAR MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING THE SAME - A vertical magnetic recording disc ( | 10-06-2011 |
20110223446 | PERPENDICULAR MAGNETIC RECORDING MEDIUM - An object of the present invention is to provide a perpendicular magnetic recording medium the SNR of which is further improved while a high coercive force Hc is secured so that a higher recoding density can be achieved. | 09-15-2011 |
20110212346 | PERPENDICULAR MAGNETIC RECORDING MEDIUM AND PROCESS FOR MANUFACTURE THEREOF - An object of the present invention is to provide a perpendicular magnetic recording medium the SNR of which is improved by reducing noise thought to be due to an auxiliary recording layer so that a higher recording density can be achieved, and a method of manufacturing the same. | 09-01-2011 |
20110206947 | METHOD OF PRODUCING A PERPENDICULAR MAGNETIC RECORDING MEDIUM - By improving sliding durability while ensuring a high SNR, an improvement in reliability and a further increase in recording density are to be achieved. | 08-25-2011 |
20110171495 | PERPENDICULAR MAGNETIC RECORDING MEDIUM - An object is to provide a perpendicular magnetic recording medium including a ground layer that prevents corrosion, while achieving a primary object of promoting finer magnetic particles of a magnetic recording layer and isolation of these magnetic particles. | 07-14-2011 |
20110111262 | METHOD FOR MANUFACTURING PERPENDICULAR MAGNETIC RECORDING MEDIUM AND PERPENDICULAR MAGNETIC RECORDING MEDIUM - An object of the present invention is to provide a method of manufacturing a perpendicular magnetic recording medium ( | 05-12-2011 |
20110102944 | METHOD OF PRODUCING A PERPENDICULAR MAGNETIC RECORDING MEDIUM AND PERPENDICULAR MAGNETIC RECORDING MEDIUM - An object of the present invention is to provide a perpendicular magnetic recording medium including a suitable lubricating layer with sufficient durability, moisture resistance, and contamination resistance and also maintaining an R/W characteristic. In a typical structure of the present invention, a method of manufacturing a perpendicular magnetic recording medium | 05-05-2011 |
20110097604 | PERPENDICULAR MAGNETIC RECORDING MEDIUM - An object of the present invention is to provide a perpendicular magnetic recording medium capable of reducing noise in an electromagnetic transducing characteristic in a configuration including a magnetic recording layer of a granular structure containing Co and an auxiliary recording layer. The perpendicular magnetic recording medium of the present invention includes: on a non-magnetic substrate, a first magnetic recording layer | 04-28-2011 |
20110097603 | PERPENDICULAR MAGNETIC RECORDING MEDIUM AND PROCESS FOR MANUFACTURE THEREOF - An object of the present invention is to provide a perpendicular magnetic recording medium in which each space between crystal grains of a first magnetic recording layer is so designed as to allow the layer to also have a function as a continuous layer, and a method of manufacturing a perpendicular magnetic recording medium. In a perpendicular magnetic recording medium | 04-28-2011 |
20110097600 | VERTICAL MAGNETIC RECORDING MEDIUM AND METHOD FOR MAKING VERTICAL MAGNETIC RECORDING MEDIUM - An object of the present invention is to provide a perpendicular magnetic recording medium | 04-28-2011 |
20110039125 | MAGNETIC RECORDING MEDIUM AND METHOD FOR MANUFACTURING MAGNETIC RECORDING MEDIUM - A method for manufacturing a magnetic recording medium for perpendicular magnetic recording includes the steps of forming a first magnetic layer which has magnetic crystal grains exhibiting perpendicular magnetic anisotropy and nonmagnetic substances for magnetically separating the magnetic crystal grains from each other at grain boundaries of the magnetic crystal grains, forming a second magnetic layer which has magnetic grains exchange-coupled to the magnetic crystal grains, a grain boundary width of the magnetic grains being smaller than a grain boundary width of the magnetic crystal grains, and forming separation regions which magnetically separate tracks from each other in regions between the tracks of the magnetic recording medium in at least the second magnetic layer. The separation regions are disposed substantially only in the second magnetic layer of the first magnetic layer and the second magnetic layer. | 02-17-2011 |