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| Number | Title | Issue Date |
| 8147995 | Patterned media bits with cladding shell A bit patterned media (BPM) includes many magnetic dots arranged in tracks on a substrate. The magnetic dots each have a hard magnetic core, a soft magnetic cladding surrounding the core and a thin non-magnetic layer that separates the hard magnetic core from the so... | 04/03/2012 |
| 8071228 | Perpendicular magnetic recording medium Embodiments of the present invention provide a perpendicular magnetic recording medium which does not cause medium noise to increase due to soft magnetic underlayers, is capable of easily controlling the thickness of a nonmagnetic layer disposed between soft magneti... | 12/06/2011 |
| 8048545 | Perpendicular magnetic recording media with magnetic anisotropy gradient and local exchange coupling A perpendicular magnetic recording medium adapted for high recording density and high data recording rate comprises a non-magnetic substrate having at least one surface with a layer stack formed thereon, the layer stack including a perpendicular recording layer cont... | 11/01/2011 |
| 8003237 | Perpendicular magnetic recording disk and manufacturing method thereof 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 ferromag... | 08/23/2011 |
| 7989096 | Perpendicular recording media having an exchange-spring structure A recording medium providing improved writeability in perpendicular recording applications includes a magnetic recording layer having an axis of magnetic anisotropy substantially perpendicular to the surface thereof, an exchange-spring layer ferromagnetically exchan... | 08/02/2011 |
| 7976964 | Disk drive with laminated magnetic thin films with sublayers for magnetic recording The invention includes a disk drive with a magnetic recording disk with an upper and lower sublayer in at least one magnetic layer of a laminated magnetic layer structure that includes a spacer layer that substantially decouples the magnetic layers. The lower sublay... | 07/12/2011 |
| 7964297 | Adhesion layer for thin film magnetic recording medium The invention uses an adhesion layer of an amorphous alloy of aluminum. A first aluminum titanium embodiment of the amorphous adhesion layer preferably contains approximately equal amounts of aluminum and titanium (+/−5 at. %). A second embodiment of the amorphous... | 06/21/2011 |
| 7923135 | Magnetic recording medium having a patterned exchange-coupling control layer and method of manufacturing same A magnetic recording medium is formed by stacking in order, on a nonmagnetic base, at least an underlayer, magnetic recording layer, and protective layer. The magnetic recording layer includes a plurality of magnetic layers and an exchange-coupling control layer, an... | 04/12/2011 |
| 7923134 | Perpendicular magnetic recording medium, method of manufacturing the same, and magnetic recording device 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 sur... | 04/12/2011 |
| 7781080 | Perpendicular magnetic recording medium A perpendicular magnetic recording medium composed of a nonmagnetic substrate having a surface onto which are provided a plurality of layers including, in the order recited, a soft underlayer; a nonmagnetic coupling layer; a hard magnetic pinning layer which is anti... | 08/24/2010 |
| 7687157 | Perpendicular recording media having an exchange-spring structure A recording medium providing improved writeability in perpendicular recording applications includes a magnetic recording layer having an axis of magnetic anisotropy substantially perpendicular to the surface thereof, an exchange-spring layer ferromagnetically exchan... | 03/30/2010 |
| 7638210 | Perpendicular magnetic recording medium with exchange-coupled magnetic layers and improved coupling layer A perpendicular magnetic recording medium has an “exchange-spring” type magnetic recording layer (RL) with an improved coupling layer (CL). The RL includes the first or lower ferromagnetic layer MAG1, sometimes called the “media” layer, the second or ... | 12/29/2009 |
| 7625643 | Magnetic recording medium, magnetic storage apparatus and recording method A magnetic recording medium is provided with a first magnetic layer, a nonmagnetic coupling layer provided on the first magnetic layer, and a second magnetic layer provided on the nonmagnetic coupling layer. The first and second magnetic layers are exchange-coupled,... | 12/01/2009 |
| 7550210 | Perpendicular magnetic recording medium with multiple exchange-coupled magnetic layers having substantially similar anisotropy fields A perpendicular magnetic recording medium has an “exchange-spring” type magnetic recording layer (RL) formed of two ferromagnetic layers with substantially similar anisotropy fields that are ferromagnetically exchange-coupled by a nonmagnetic or weakly ferromagn... | 06/23/2009 |
| RE40726 | Patterned magnetic recording media with discrete magnetic regions separated by regions of antiferromagnetically coupled films A magnetic recording disk is patterned into discrete magnetic and nonmagnetic regions with the magnetic regions serving as the magnetic recording data bits. The magnetic recording layer comprises two ferromagnetic films separated by a nonferromagnetic spacer film. T... | 06/09/2009 |
| 7514161 | Laminated antiferromagnetically coupled media with decoupled magnetic layer A laminated film structure is disclosed comprising multiple ferromagnetic layers achieving improved data recording performance. A non-magnetic spacer layer is disposed between an upper ferromagnetic layer and an antiferromagnetic coupled (AFC) structure. The AFC str... | 04/07/2009 |
| 7504167 | Contact magnetic transfer template having magnetic islands of antiferromagnetically-coupled ferromagnetic films A contact magnetic transfer (CMT) master template with antiferromagnetically-coupled (AF-coupled) magnetic islands is used for transferring a magnetic pattern, such as a servo pattern, to a magnetic recording disk. The template is a rigid or flexible substrate with ... | 03/17/2009 |
| 7427446 | Magnetic recording medium with antiparallel magnetic layers and CrN based underlayer, magnetic storage apparatus and method of producing magnetic recording medium A magnetic recording medium including a substrate, a first underlayer provided on the substrate, a first magnetic layer provided on the first underlayer, a nonmagnetic coupling layer provided on the first magnetic layer, and a second magnetic layer provided on the n... | 09/23/2008 |
| 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 |
| 7419729 | Multilayered ferromagnetic laminate having alternating cobalt alloy and iron-nitrogen alloy films for use with magnetic heads A multilayered ferromagnetic laminate includes a first magnetic film having a cobalt alloy and a second magnetic film having an iron-nitrogen alloy. The films are deposited upon one another and laminated to provide a multilayered film structure having an alternating... | 09/02/2008 |
| 7407719 | Longitudinal magnetic media having a granular magnetic layer A novel method of manufacturing a longitudinal granular oxide recording medium is disclosed. The method preferably entails obtaining a non-magnetic substrate, heating the substrate at a temperature T1 that is greater than 150° C., forming a first layer w... | 08/05/2008 |
| 7393601 | Weak antiferromagnetically coupled media with a five element magnetic alloy and a low moment stabilizing layer A magnetic recording medium having a substrate, underlayer, a low moment stabilizing layer, an antiferromagnetic coupling layer, a low magnetic layer having a magnetic saturation of equal to or less than 250 emu/cm2, and a high moment magnetic layer havin... | 07/01/2008 |
| 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 |
| 7357998 | Disk substrate for a perpendicular magnetic recording medium, perpendicular magnetic recording disk and manufacturing methods thereof A disk substrate for a perpendicular magnetic recording medium comprises a disk base member, a soft magnetic layer formed on the disk base member, and a protection layer formed on the soft magnetic layer. The soft magnetic layer and the protection layer are deposite... | 04/15/2008 |
| 7354664 | Magnetically soft, high saturation magnetization laminate of iron-cobalt-nitrogen and iron-nickel for perpendicular media underlayers A magnetic disk has a soft magnetic underlayer comprising a first layer containing NiFe having a concentration of iron that is at least thirty percent and not more than seventy percent; a second layer that adjoins the first layer and contains FeCoN having a concentr... | 04/08/2008 |
| 7348078 | Perpendicular magnetic recording medium and magnetic storage apparatus An improved perpendicular magnetic recording medium and an improved magnetic storage apparatus are provided, which are suitable for high speed and high density magnetic recording. A magnetic under layer of a two-layered perpendicular magnetic recording medium includ... | 03/25/2008 |
| 7327528 | Magnetic recording medium and magnetic storage apparatus A magnetic recording method for recording information on a medium with a first magnetic layer, a second magnetic layer, and a non-magnetic coupling layer provided between the first and second magnetic layers so that these two layers are exchange-coupled and the firs... | 02/05/2008 |
| 7320169 | Self-pinned GMR structure by annealing In a conventional spin valve the shunt resistance of the pinning layer reduces the overall efficiency of the device. This problem has been overcome by using IrMn for the pinning layer at a thickness of about 20 Angstroms or less. For the IrMn to be fully effective i... | 01/22/2008 |
| 7314675 | Magnetic media with high Ms magnetic layer Magnetic recording media having a magnetic layer, wherein the magnetic layer comprises a continuous matrix material and a separate portion that is different from the matrix is disclosed. The matrix comprises a non-ferromagnetic material that is non-ferromagnetic in ... | 01/01/2008 |
| 7295404 | Magnetic recording medium for perpendicular recording and magnetic storage apparatus using the same A perpendicular magnetic recording medium at least comprises a perpendicular magnetic recording layer and a backing layer backing the perpendicular magnetic recording layer. The backing layer has an in-plane magnetization and is formed of a ferrimagnetic material ha... | 11/13/2007 |
| 7294419 | High density magnetic recording medium having uniform local coercivity distribution and grain size distribution and fine grains and manufacturing method thereof Disclosed is herein a magnetic recording medium useful for high density magnetic recording, which contains an optimum composition of Pt so as to have a uniform local coercivity distribution and grain size distribution, and fine grains, and a method of manufacturing ... | 11/13/2007 |
| 7282277 | Magnetic recording media with Cu-containing magnetic layers A magnetic recording medium including at least one Cu-containing magnetic recording layer (CuML) comprised of a Cu-containing magnetic alloy material selected from the group consisting of: (a) a CoCrPtBCu alloy having a composition... | 10/16/2007 |
| 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 |
| 7273667 | Longitudinal multi-layer magnetic recording medium A magnetic recording medium capable of attaining high in-plane recording density of 100 Mbits or more per 1 mm2 is provided. Magnetic recording medium is provided in which underlayers, a first magnetic layer, a first intermediate layer, a second magnetic ... | 09/25/2007 |
| 7271984 | Magnetic recording medium having at least two coupled magnetic layers, magnetic storage apparatus and recording method A magnetic recording medium is provided with a first magnetic layer, a nonmagnetic coupling layer provided on the first magnetic layer, and a second magnetic layer provided on the nonmagnetic coupling layer. The first and second magnetic layers are exchange-coupled,... | 09/18/2007 |
| 7267894 | Magnetic recording medium and magnetic recording apparatus A magnetic recording apparatus including a drive unit to drive the magnetic recording medium, a compound-type magnetic head, a means to move the magnetic head relative to the magnetic recording medium, and a means to process recording and retrieving signals generate... | 09/11/2007 |
| 7267896 | Magnetic tape and magnetic tape cartridge A magnetic recording medium comprising a non-magnetic support; at least one lower magnetic layer containing magnetic powder and a binder resin, which is formed on one side of the non-magnetic support with or without a non-magnetic primer layer interposed between the... | 09/11/2007 |
| 7259941 | Magnetoresistive sensor having a high coercivity hard bias structure A magnetoresistive sensor having a hard bias structure having increased coercivity and squareness. The structure also allows the use of a thinner seed layer, which results in improved biasing by decreasing the spacing between the hard magnetic bias layer and the fre... | 08/21/2007 |
| 7241517 | Magnetic recording medium and magnetic storage apparatus A magnetic recording medium is constructed to include a lower magnetic layer, a nonmagnetic spacer layer disposed on the lower magnetic layer, and an upper magnetic layer disposed on the nonmagnetic spacer layer, where the upper and lower magnetic layers are antifer... | 07/10/2007 |
| 7242553 | Substrate for magnetic recording medium When a soft magnetic layer for a double layer type perpendicular magnetic recording medium is formed by a plating method, there is the problem of the occurrence of an isolated pulse noise called spike noise so that signal reproduction characteristics are lost. In or... | 07/10/2007 |
