| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 428829000 | Differing compositions in plurality of magnetic layers (e.g., layer compositions having differing elemental components, different proportions of elements, etc.) | 17 |
| 20080241599 | CARBONIC ACID ESTER AND MAGNETIC RECORDING MEDIUM - A carbonic acid ester is provided that is represented by the formula below and has a melting point of no greater than 0° C. | 10-02-2008 |
| 20080261080 | LONGITUDINAL MAGNETIC RECORDING MEDIUM - A magnetic recording medium includes as formed on a non-magnetic substrate, a seed layer, an underlayer of a bcc structure-having Cr alloy, an interlayer of an hcp structure-having Ru alloy, a lower recording layer of a Co—Cr—Pt—B base alloy, an upper recording layer having the same alloying base components as those of the lower recording layer, a larger B atom concentration and having a larger Co atom concentration to Cr atom concentration ratio, and a protective layer. The lower recording layer includes a first and a second lower recording layer. When the B atom concentration in the first lower recording layer is B1 and that of the second lower recording layer is B2, then B1| 10-23-2008 | |
| 20090042063 | MAGNETIC RECORDING MEDIUM - A magnetic recording medium comprising a nonmagnetic substrate, and a soft magnetic layer and a ferromagnetic layer formed in this order on the nonmagnetic layer, in which the ferromagnetic layer has a thickness of from 3 to 150 nm, contains spherical, ellipsoidal or plate-form ferromagnetic particles and a binder, and has an axis of easy magnetization substantially in the vertical direction, and the soft magnetic layer contains spherical or ellipsoidal Fe—Co-containing soft magnetic particles having a saturation magnetization of from 170 to 220 Am | 02-12-2009 |
| 20090258253 | Magnetic recording medium for high density recording and magnetic storage device using same - In one embodiment, a magnetic recording medium comprises an underlying film, a magnetic film and a protective film formed in this order on a substrate. The magnetic film is a cobalt-base alloy film containing chromium and has a plurality of magnetic layers stacked without interposition of any non-magnetic layer. The plural magnetic layers comprise first, second and third magnetic layers. The first magnetic layer is disposed between the underlying film and the second magnetic layer. The second magnetic layer is disposed between the first magnetic layer and the third magnetic layer. The third magnetic layer is disposed between the second magnetic layer and the protective film. The concentration of chromium contained in the first magnetic layer is lower than that of chromium contained in the second magnetic layer. The thickness of the first magnetic layer is smaller than that of the second magnetic layer. The magnetic layers which overlie the first magnetic layer further contain platinum and boron. The concentration of chromium contained in the third magnetic layer is lower than that of chromium contained in the second magnetic layer. | 10-15-2009 |
| 20100009218 | RUTHENIUM (Ru)/RUTHENIUM OXIDE (RuOx) DOPING OF GRAIN BOUNDARIES OF GRANULAR RECORDING MEDIA FOR ENHANCED CORROSION RESISTANCE/GREATER ADHESION - The invention relates to a perpendicular magnetic recording medium comprising a substrate and a granular magnetic layer comprising ruthenium or ruthenium oxide in the grain boundaries. | 01-14-2010 |
| 20100021768 | MAGNETIC RECORDING MEDIUM, MAGNETIC RECORDING MEDIUM MANUFACTURING METHOD, AND MAGNETIC DISK - [PROBLEMS] To improve the track density by reducing the track edge noise and sharpening the boundaries of a recording magnetic field by blocking the recording magnetic field spreading outside the recording region in magnetic recording. | 01-28-2010 |
| 20100159283 | MAGNETIC STORAGE MEDIUM, MANUFACTURING METHOD OF MAGNETIC STORAGE MEDIUM, AND INFORMATION STORAGE DEVICE - A magnetic storage medium includes a substrate, a first magnetic layer film that is deposited on the substrate, and a second magnetic layer film that is a cap layer of the first magnetic layer film. The first magnetic layer film contains a high magnetic anisotropic material and a low-temperature diffusion material which is added to the high magnetic anisotropic material, the low-temperature diffusion material starting diffusion by thermal treatment at a lower temperature than that of the high magnetic anisotropic material. The second magnetic layer film includes a material for promoting diffusion of the low-temperature diffusion material. | 06-24-2010 |
| 20110177360 | METHOD OF PRODUCING PERPENDICULAR MAGNETIC RECORDING MEDIUM - A method of producing a perpendicular magnetic recording medium with a magnetic recording layer formed from ferromagnetic crystal grains and oxide-including non-magnetic crystal grain boundaries and provided on a non-magnetic substrate. The method is initiated by forming the magnetic recording layer by a reactive sputtering method using rare gas containing 2% by volume to 10% by volume (both inclusively) of oxygen gas at an initial stage of film formation. The method continues by successively forming the magnetic recording layer by reactive sputtering while reducing the concentration of the oxygen gas. The method may further include forming an undercoat layer of Ru or a Ru-alloy under the magnetic recording layer. In this manner, a granular magnetic layer having high characteristic coercive force (Hc) can be formed, while reducing the amount of expensive Pt or Ru required. | 07-21-2011 |
| 20110268993 | SILICON/GOLD SEED STRUCTURE FOR CRYSTALLINE ALIGNMENT IN A FILM STACK - A silicon/gold (Si/Au) bilayer seed structure is located in a film stack between an amorphous or crystalline lower layer and an upper layer with a well-defined crystalline structure. The seed structure includes a Si layer on the generally flat surface of the lower layer and a Au layer on the Si layer. The Si/Au interface initiates the growth of the Au layer with a face-centered-cubic (fcc) crystalline structure with the (111) plane oriented in-plane. The upper layer grown on the Au layer has a fcc or hexagonal-close-packed (hcp) crystalline structure. If the upper layer is a fcc material its [111] direction is oriented substantially perpendicular to the (111) plane of the Au layer and if the upper layer is a hcp material, its c-axis is oriented substantially perpendicular to the (111) plane of the Au layer. | 11-03-2011 |
| 20120141834 | REDUCED SPACING RECORDING APPARATUS - Aspects include recording media with enhanced areal density through reduction of head media spacing, head keeper spacing, or head to soft underlayer spacing. Such aspects comprise replacing currently non-magnetic components of devices, such as interlayers and overcoats with components and compositions comprising magnetic materials. Other aspects relate to magnetic seed layers deposited within a recording medium. Preferably, these aspects, embodied as methods, systems and/or components thereof reduce effective magnetic spacing without sacrificing physical spacing. | 06-07-2012 |
| 20120225325 | MAGNETIC RECORDING MEDIUM - Surface flatness of magnetic recording medium to which a magnetic recording layer made of L1 | 09-06-2012 |
| 20130143073 | Perpendicular Magnetic Recording Layer with Regions Having Different Magnetic Anisotropy Constants - An apparatus having a recording layer of a magnetic material with a concentration of implanted ions that increases in relation to a thickness direction of the recording layer to provide the recording layer with a continuously varied perpendicular magnetic anisotropy constant. | 06-06-2013 |
| 20130209835 | MULTIPLE LAYER FEPT STRUCTURE - A method involves depositing a seed layer comprising at least A1 phase FePt. A main layer of A1 phase FePt is deposited over the seed layer. The main layer includes FePt of a different stoichiometry than the seed layer. The seed and main layers are annealed to convert the A1 phase FePt to L10 phase FePt. The annealing involves heating the substrate prior to depositing at least part of the A1 phase FePt of the main or seed layers. | 08-15-2013 |
| 20140178714 | Method and Manufacture Process for Exchange Decoupled First Magnetic Layer - A perpendicular magnetic recording medium having a dual-layer magnetic film is disclosed. The bottom layer is completely exchange decoupled, and the top layer contains a certain amount of exchange coupling optimized for recording performance. Preferably, the bottom magnetic layer contains stable oxide material (for example, TiO | 06-26-2014 |
| 20140377590 | MAGNETIC RECORDING MEDIUM FOR HEAT-ASSISTED MAGNETIC RECORDING - A magnetic recording medium for heat-assisted magnetic recording is provided. A magnetic recording layer includes upper and lower magnetic recording layers. The lower magnetic recording layer has a lower granular structure including lower magnetic crystal grains, and a lower non-magnetic portion, that surrounds the lower magnetic crystal grains, mainly composed of carbon. The upper magnetic recording layer has an upper granular structure including upper magnetic crystal grains, and an upper non-magnetic portion, that surrounds the upper magnetic crystal grains, formed from a material selected from the group consisting of silicon nitride, titanium oxide and titanium nitride. | 12-25-2014 |
| 20150132608 | PERPENDICULAR MAGNETIC RECORDING MEDIUM - A perpendicular magnetic recording medium includes at least a nonmagnetic substrate and a magnetic recording layer. The magnetic recording layer is constituted by a plurality of layers that includes at least a first magnetic recording layer and a second magnetic recording layer. The first magnetic recording layer has a granular structure that includes first magnetic crystal grains and first nonmagnetic crystal grain boundaries surrounding the first magnetic crystal grains. The first magnetic crystal grains include an ordered alloy, and the first nonmagnetic crystal grain boundaries are constituted by carbon. The second magnetic recording layer has a granular structure that includes second magnetic crystal grains and a second nonmagnetic crystal grain boundaries that surround the second magnetic crystal grains. The second magnetic crystal grains include an ordered alloy, and the second nonmagnetic crystal grain boundaries are constituted by a carbon-containing nonmagnetic material. | 05-14-2015 |
| 20150332721 | Stack Including a Magnetic Zero Layer - A stack including a crystallographic orientation interlayer, a magnetic zero layer disposed on the interlayer, and a magnetic recording layer disposed on the magnetic zero layer is disclosed. The magnetic zero layer is non-magnetic or has a saturation magnetic flux density (B | 11-19-2015 |
