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| Number | Title | Issue Date |
| 7556871 | Magnetic recording medium containing first and second recording layers, each layer containing a columnar structure Embodiments of the invention provide a perpendicular magnetic recording medium capable of reconciling a high recording density with high thermal stability, and having a high write-ability while maintaining high magnetic anisotropy energy. In one embodiment, a perpen... | 07/07/2009 |
| 7425377 | Incoherently-reversing magnetic laminate with exchange coupled ferromagnetic layers A laminate structure is disclosed comprising multiple ferromagnetic layers achieving incoherent reversal while maintaining good SNR. A high magnetic moment density, low anisotropy field material may form a thin overlayer deposited over a high-anisotropy media layer.... | 09/16/2008 |
| 7419730 | Magnetic recording disk with antiferromagnetically coupled master layer including copper An antiferromagnetically coupled (AFC) magnetic recording medium with an AFC master layer comprising at least two magnetic layers with the top magnetic layer including copper is described. The slave layer is separated from the master layer structure by a nonmagnetic... | 09/02/2008 |
| 7402348 | Perpendicular magnetic recording medium A magnetic recording layer is formed on an auxiliary magnetic layer in a perpendicular magnetic recording medium. The auxiliary magnetic layer has the axis of easy magnetization in the vertical direction perpendicular to the surface of a substrate. The perpendicular... | 07/22/2008 |
| 7381481 | Magnetic tape having controlled heat-shrinkage and humidity expansion with two or more column-like magnetic layers A magnetic tape having a small degree of deformation, high form stability and little decrease in reproduction output even after stock at a high humidity is provided. The magnetic tape includes a longitudinally extending nonmagnetic support, a magnetic layer formed b... | 06/03/2008 |
| 7378164 | Soft underlayer structure for magnetic recording A magnetic recording medium having a soft magnetic underlayer structure that includes two soft underlayers is presented. A thick first soft underlayer, disposed on the medium substrate, is made of material which provides a low magnitude of magnetization saturation (... | 05/27/2008 |
| 7368184 | Magnetic recording medium and magnetic recording device A magnetic recording medium which has a high areal density and reduced power consumption for recording operations, and a magnetic recording device incorporating the magnetic recording medium. The magnetic recording medium has an upper soft magnetic layer formed unif... | 05/06/2008 |
| 7351445 | Magnetic recording media and method of forming them The present invention is directed to carrying out a high density magnetic recording to a material having a large coercive force by perpendicular magnetic recording head. By giving a patterning onto a soft magnetic under layer of a perpendicular two-layer reco... | 04/01/2008 |
| 7297421 | Evaporation type magnetic recording medium and magnetic recording and reproducing device A lower magnetic layer magnetized and formed in a first direction and an upper magnetic layer magnetized and formed in a second direction opposite to the lower magnetic layer are laminated on a base. A ratio T1/T2 of a thickness T1 o... | 11/20/2007 |
| 7286324 | Cobalt-platinum or iron-plantinum magnetic material containing 1% to 40% Cu, Ni or B A CoPt- or FePt-alloy magnetic material in which a temperature to transform into an L10-ordered alloy is reduced and magnetic anisotropy energy is controlled, and a method for manufacturing the magnetic material are provided. In a CoPt- or FePt-alloy magn... | 10/23/2007 |
| 7279240 | Laminated perpendicular magnetic recording media with uncorrelated grains A laminated perpendicular magnetic recording medium comprises a non-magnetic substrate and at least a pair of polycrystalline, vertically stacked, spaced-apart perpendicular magnetic layers supported thereon, wherein each of the magnetic layers has substantially the... | 10/09/2007 |
| 7201977 | Anti-ferromagnetically coupled granular-continuous magnetic recording media An anti-ferromagnetically coupled, granular-continuous (“AFC-GC”) magnetic recording medium having increased thermal stability, writability, and signal-to-medium noise ratio (“SMNR”), comprising a layer stack including, in sequence from a surface of a non-ma... | 04/10/2007 |
| 7195827 | Perpendicular magnetic recording medium A perpendicular magnetic recording medium includes a substrate, an underlayer formed on the substrate, and containing at least one element selected from the group A consisting of Pt, Pd, Rh, Ag, Au, Ir and Fe, and at least one element or compound selected from the g... | 03/27/2007 |
| 7172824 | Laminated perpendicular magnetic recording media with uncorrelated grains A laminated perpendicular magnetic recording medium comprises a non-magnetic substrate and at least a pair of polycrystalline, vertically stacked, spaced-apart perpendicular magnetic layers supported thereon, wherein each of the magnetic layers has substantially the... | 02/06/2007 |
| 7166261 | Method of patterning products using chemical reaction A method of patterning magnetic material includes forming a ferromagnetic material layer containing one element selected from the group consisting of Fe, Co and Ni on a substrate, selectively masking a surface of the ferromagnetic material layer, and making nonferro... | 01/23/2007 |
| 7158346 | Heat assisted magnetic recording film including superparamagnetic nanoparticles dispersed in an antiferromagnetic or ferrimagnetic matrix Heat assisted magnetic recording systems with composite recording films are disclosed. The magnetic recording films include superparamagnetic nanoparticles dispersed in an antiferromagnetic or ferrimagnetic matrix. The matrix provides antiferromagnetic coupling with... | 01/02/2007 |
| 7153557 | Security document with marker The present invention relates to a self-adhesive or thermally bondable security document that can be affixed to an article, characterized in that it comprises at least one medium capable of receiving print on the front side, said medium having, on its reverse side, ... | 12/26/2006 |
| 7079361 | Magnetoresistive element and magnetoresistive magnetic head, magnetic recording apparatus and magnetoresistive memory device using the same The present invention provides a magnetoresistive (MR) element that is excellent in MR ratio and thermal stability and includes at least one magnetic layer including a ferromagnetic material M-X expressed by M100-aXa. Here, M is at least one se... | 07/18/2006 |
| 7074508 | Magnetic recording medium including at least one superparamagnetic layer and magnetic storage apparatus A magnetic recording medium has a base structure, and a synthetic ferrimagnetic structure which is disposed on the base structure and forms a recording layer. The synthetic ferrimagnetic structure includes at least a bottom magnetic layer and a top magnetic layer wh... | 07/11/2006 |
| 7060375 | Perpendicular magnetic recording media A perpendicular magnetic recording medium having a good thermal stability and a high recording density is provided. The perpendicular magnetic recording medium includes at least a first and a second perpendicular magnetic recording layer and a substrate supporting t... | 06/13/2006 |
| 7008705 | Layered polycrystalline structure and method of making the same A layered polycrystalline structure includes a seed crystal or Cr layer containing non-magnetic Cr atoms. A non-magnetic crystal layer such as a Co65Cr35 layer is formed on the exposed surface of the seed crystal layer. A magnetic crystal layer... | 03/07/2006 |
| 6667119 | Magnetic recording medium comprising magnetic layers, the coercive force thereof specifically related to saturation magnetic flux density A magnetic recording medium having on a support at least two magnetic layers that include an uppermost magnetic layer for recording information and a lower magnetic layer for recording servo signals, wherein the uppermost magnetic layer has a coercive for... | 12/23/2003 |
| 6660357 | Perpendicular magnetic recording media with laminated soft magnetic underlayer Magnetic recording media having a biased soft magnetic underlayer are disclosed. The soft magnetic underlayer includes at least two soft magnetic layers separated by a thin non-magnetic layer. Magnetostatic coupling between the soft magnetic layers causes... | 12/09/2003 |
| 6652999 | Magnetic recording medium and signal recording system comprising at least two magnetic layers with orthogonally oriented axes A magnetic recording medium comprising two or more magnetic layers provided on a support, wherein an easily magnetizable axis of an uppermost magnetic layer and an easily magnetizable axis of a lower magnetic layer are oriented in directions crossing each... | 11/25/2003 |
| 6645647 | Magnetic recording media including magnetically soft composite layer and method of making same Magnetic recording disks having a composite soft magnetic layer are provided. The soft magnetic layer includes a relatively thick layer of low saturation moment soft magnetic material and a relatively thin layer of high saturation moment soft magnetic mat... | 11/11/2003 |
| 6613428 | Magnetic recording medium and magnetic recording and reproducing apparatus wherein the magnetic layer has a fluctuation of field; A or Hf of not less than 30 Oersteds A thin film magnetic recording medium including a magnetic layer having a fluctuation field defined as S/Xirr, where S is magnetic viscosity and Xirr is irreversible susceptibility Xirr. The fluctuation field of the magnet... | 09/02/2003 |
| 6610424 | Magnetic recording medium and magnetic storage apparatus A magnetic recording medium provided with a substrate and a magnetic layer disposed above the substrate, is characterized by the magnetic layer which includes an initial layer located closer to the substrate and a final layer located further away from the... | 08/26/2003 |
| 5525398 | Perpendicular magnetic recording medium and method for making A perpendicular magnetic recording medium has a magnetic layer comprised of two stacked sublayers each in the form of ferromagnetic metal thin film consisting of columnar crystal grains wherein the angle θ between the average growth direction of the colu... | 06/11/1996 |
| 5432012 | Thin-film medium with compositional gradient A magnetic thin-film media with high coercivity and low noise characteristics is disclosed. The medium has a gradient-composition thin-film magnetic layer in which a lowermost stratum is composed of a first alloy, preferably, having relatively low noise a... | 07/11/1995 |
| 5225234 | Magnetic recording medium comprising multiple thin film magnetic layers each formed within specified maximum and minimum incident angles A magnetic recording medium of the longitudinal recording type is comprised of a magnetic layer on one major surface of a non-magnetic substrate wherein the magnetic layer consists of at least two layers of cobalt-based ferromagnetic metal thin film which... | 07/06/1993 |
| 5202149 | Method for making a magnetic recording medium In the method for making the magnetic recording wherein a first magnetic layer is formed on a substrate and a second magnetic layer is formed on the first magnetic layer, before forming the second magnetic layer, accelerated ions are irradiated onto a sur... | 04/13/1993 |
| 5068147 | Soft magnetic thin film comprising alternate layers of iron carbide with either iron, iron nitride or iron carbon-nitride In a soft-magnetic thin film, layers of iron carbide are laminated alternately with layers of at least one of iron, iron nitride and iron carbon-nitride and when needed, layers of non-magnetic material. The thin film provides particular features including... | 11/26/1991 |
| 4871582 | Method of manufacturing magnetic recording medium Disclosed is a method of manufacturing a magnetic recording medium which comprises the steps of: forming a non-magnetic layer on a substrate by using a non-magnetic material which is magnetizable by heat to a predetermined temperature, and then locally he... | 10/03/1989 |
| 4828919 | Magnetic recording medium and process for preparing the same A magnetic recording medium comprising a non-magnetic substrate, a soft magnetic layer formed thereon, and a perpendicularly magnetizable layer formed on the soft magnetic layer, where at least the soft magnetic layer is a vapor deposited mixture layer co... | 05/09/1989 |
| 4794047 | Method of manufacturing magnetic recording medium The method of manufacturing a magnetic recording medium according to the present invention comprises a first step in which a ferromagnetic metal layer of a predetermined thickness is formed on a substrate, and a second step contiguous to said first step a... | 12/27/1988 |
| 4731300 | Perpendicular magnetic recording medium and manufacturing method thereof A perpendicular magnetic recording medium comprises a recording medium base, a low coercivity layer formed on the recording medium base and having a low coercivity in an in-plane direction thereof, and a high coercivity layer formed on the low coercivity ... | 03/15/1988 |
| 4717592 | Vertical magnetization type recording medium and manufacturing method therefor In forming a vertical magnetization type recording medium, a first soft magnetic film layer is formed on each side of a film-shaped support by vacuum deposition or sputtering at a temperature of 30° C. or lower, a second soft magnetic film layer is forme... | 01/05/1988 |
| 4686154 | Security system label A security label comprised of at least two magnetically soft materials having different coercivities but similar thresholds of magnetic saturation.... | 08/11/1987 |
| 4666788 | Perpendicular magnetic recording medium, method for producing the same, and sputtering device A magnetic recording medium conventionally utilizes the in-plane magnetization mode, but recently the perpendicular magnetization mode utilizing the perpendicular anisotropy of an hcp cobalt alloy layer, in which the C axis is oriented perpendicular to th... | 05/19/1987 |
| 4642270 | Magnetic recording medium In a magnetic recording medium comprising a non-magnetic substrate and a magnetic thin film formed on the surface thereof and including at least two layers, the upper layer in the form of a crystalline cobalt-chromium alloy layer suitable for perpendicula... | 02/10/1987 |
