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| Number | Title | Issue Date |
| 8270112 | Magnetic head with spin oscillation device(s) and magnetic recording device It is made possible to provide a magnetic head that generates a sufficient high-frequency magnetic field for assisting recording operations, and a magnetic recording device that includes the magnetic head. A magnetic head includes: a recording magnetic pole; a retur... | 09/18/2012 |
| 8154825 | Magnetic recording head and magnetic recording device It is made possible to provide a magnetic head that can stabilize the high-frequency magnetic field generated from the spin torque oscillator. A magnetic head includes: first and second main magnetic poles; and a spin torque oscillator provided between the first and... | 04/10/2012 |
| 8050171 | Information recording/reproducing device having head covering by resistance element An information recording/reproducing device according to an example of the present invention includes a first head and a second head each having a conductive region formed of a conductive material, a recording medium having a data area from which data is read by the... | 11/01/2011 |
| 7961586 | Information recording/reproducing device An information recording/reproducing device according to an example of the present invention includes first and second heads, a recording medium having a data area from which recording data is read by the first head and a servo burst area from which a servo burst si... | 06/14/2011 |
| 7852739 | Positioning system mounted on probe memory device and positioning method thereof A probe memory device carries out positioning with the use of a servo pattern provided in a servo area on a recording medium, and the recording medium and a probe head section are reciprocatingly moved (scan-moved) by vibration at a specific frequency in a one-axis ... | 12/14/2010 |
| 7791829 | Apparatus for assisting write operation using high frequency magnetic field in disk drive According to one embodiment, a disk drive having a spin torque oscillator and designed to perform high frequency assisted writing. The disk drive has a magnetic disk, a magnetic head, a coil, and a drive current controller. The drive current controller controls a dr... | 09/07/2010 |
| 7664001 | Method of holographic recording and reproduction, holographic recording medium and holographic recording and reproducing apparatus A method of holographic recording and reproduction includes recording to the holographic recording medium a wavelength variation reference pattern which is recorded as a hologram at a wavelength of the recording beam, recording to the holographic recording medium a ... | 02/16/2010 |
| 7054087 | Magnetic recording-reproducing apparatus A magnetic recording-reproducing apparatus has a magnetic recording medium having a nonmagnetic substrate, and a functional layer and a recording layer formed on the nonmagnetic substrate, the recording layer exhibiting a magnetic anisotropy energy density KuRL... | 05/30/2006 |
| 7042810 | Thermally-assisted magnetic recording head, method of manufacturing the same, and thermally-assisted magnetic recording apparatus A thermally-assisted magnetic recording head and a magnetic recording apparatus having the magnetic recording head built in are disclosed. The magnetic recording head is capable of recording magnetic information by heating a recording unit of a recording medium and ... | 05/09/2006 |
| 6972923 | Magnetic recording medium and magnetic recording/reproducing apparatus using the same A magnetic recording medium has a substrate, and a servo signal recording magnetic layer whose magnetization is oriented in a direction perpendicular to a surface thereof, a non-magnetic layer and a data recording magnetic layer, which are stacked on the substrate i... | 12/06/2005 |
| 6930847 | Magnetic recording-reproducing apparatus A magnetic recording-reproducing apparatus has a magnetic recording medium having a nonmagnetic substrate, and a functional layer and a recording layer formed on the nonmagnetic substrate, the recording layer exhibiting a magnetic anisotropy energy density KuRL... | 08/16/2005 |
| 6894857 | Magnetic recording apparatus and method of designing the same A method of designing a thermally-assisted magnetic recording apparatus having a magnetic recording medium, a heater and a magnetic head includes, determining a stable retention time tst for recorded magnetization and a thermal-fluctuation stability coeff... | 05/17/2005 |
| 6830824 | Magnetic recording medium with multiple magnetic layers capable of being exchange coupled at elevated temperatures and magnetic recording apparatus A magnetic recording medium has a substrate, a base layer formed on the substrate and including a magnetic material, a switching layer formed on the base layer and including a nonmagnetic material, and a recording layer formed on the switching layer and having a str... | 12/14/2004 |
| 6777078 | Magnetic recording medium with L10 crystal grains including three or more elements A magnetic recording medium has a substrate, an underlayer formed on the substrate, a magnetic layer formed on the underlayer and including crystal grains having an L10 structure mainly including Fe and Pt, mainly including Fe and Pd, or mainly including ... | 08/17/2004 |
| 6741524 | Thermally-assisted magnetic recording and reproducing device having an electron beam thermal source Electrons are directed from an electron emitter towards a magnetic recording medium to heat a recording portion of the magnetic recording medium and magnetic information is written by a magnetic recording head to the temperature-elevated recording portion. Otherwise... | 05/25/2004 |
| 6636460 | Thermally-assisted magnetic recording method and thermally-assisted magnetic recorder In a thermally-assisted magnetic recorder configured to heat a medium with a heat source like a light beam and thereby decrease the coercive force of a recording portion so as to magnetically record information on the recording portion decreased in coerci... | 10/21/2003 |
| 6483673 | Differential detection magnetoresistance head with laminated structure A GMR element part is formed of a laminated structure which comprises at least one pair of ferromagnetic layers and a nonmagnetic intermediate layer interposed between the pair of ferromagnetic layers. Signal magnetic field detecting ferromagnetic layers ... | 11/19/2002 |
| 6285528 | Thin-film magnetic head A thin-film magnetic head including a ring-shaped magnetic core and a coil surrounded by the magnetic core, given that an inner circumferential length of the magnetic core surrounding the coil is Lc, a magnetic gap length is g, a magnetic gap depth is D, ... | 09/04/2001 |
| 6195233 | Perpendicular thin-film magnetic head Disclosed is a thin-film magnetic head comprising a ring-shaped magnetic core and a coil surrounded by the magnetic core, given that an inner circumferential length of the magnetic core surrounding the coil is Lc, a magnetic gap length is g, a magnetic ga... | 02/27/2001 |
| 6172858 | Thin film head The present invention provides a thin film head having a magnetoresistance effect element which includes at least two magnetic films, a nonmagnetic film sandwiched between the magnetic films, and leads connected to the magnetoresistance effect element whe... | 01/09/2001 |
| 6046891 | Thin film head The present invention provides a thin film head having a magnetoresistance effect element which includes at least two magnetic films, a nonmagnetic film sandwiched between the magnetic films, and leads connected to the magnetoresistance effect element whe... | 04/04/2000 |
| 6021024 | Magnetic disk drive having a constant skew angle A magnetic disk drive for carrying out reading/writing of information to/from a magnetic disk having a plurality of tracks including an innermost circumference track and an outermost circumference track. The disk drive includes a rotary actuator and a mag... | 02/01/2000 |
| 5949600 | Signal reproduction method and magnetic recording and reproducing apparatus using tunnel current A magnetic recording and reproducing apparatus, including a probe made of a ferromagnetic film movable relative to a magnetic recording medium while having a distal end facing the magnetic recording medium; a head section having a recording element for re... | 09/07/1999 |
| 5942342 | Perpendicular recording medium and magnetic recording apparatus A magnetic recording apparatus comprising a perpendicular recording medium, a recording head for perpendicular magnetization the perpendicular magnetization film of the recording medium, to thereby recording signals on the recording medium, and a reproduc... | 08/24/1999 |
| 5905611 | Thin film magnetic head responsive to spin-dependent scattering The present invention provides a thin film head having a magnetoresistance effect element which includes at least two magnetic films, a nonmagnetic film sandwiched between the magnetic films, and leads connected to the magnetoresistance effect element whe... | 05/18/1999 |
| 5828525 | Differential detection magnetoresistance head A GMR element part is formed of a laminated structure which comprises at least one pair of ferromagnetic layers and a nonmagnetic intermediate layer interposed between the pair of ferromagnetic layers. Signal magnetic field detecting ferromagnetic layers ... | 10/27/1998 |
| 5815342 | Perpendicular magnetic recording/reproducing apparatus Disclosed is a perpendicular magnetic recording/reproducing apparatus comprising perpendicular magnetic recording media and magnetic heads. Each perpendicular magnetic recording medium has a substrate, a soft magnetic back layer and a magnetic recording l... | 09/29/1998 |
| 5801908 | Magnetic disk drive comprising rotary actuator arm having optimal arm length for minimizing track misregistration A magnetic disk drive that records and reproduces data onto and from a magnetic disk is provided with a rotary actuator arm tilt which has a length such that the variation of the skew angle formed where a line, connecting the center of rotation of rotary ... | 09/01/1998 |
| 5792564 | Perpendicular recording medium and magnetic recording apparatus A longitudinal recording medium and a magnetic recording apparatus containing the same, comprising a substrate and a longitudinal magnetization film formed on the substrate containing grains of a Co-based alloy, and exhibiting an oxygen concentration dist... | 08/11/1998 |
| 5768066 | Magnetoresistive head having an antiferromagnetic layer interposed between first and second magnetoresistive elements A magnetoresistive head including a first magnetoresistive element, a second magnetoresistive element, and an antiferromagnetic layer interposed between the first and second magnetoresistive elements. The antiferromagnetic layer may be replaced by two ant... | 06/16/1998 |
| 5712739 | Magnetic disk drive system with a composite head unit including a magnetoresistive read only head and an inductive write only head A magnetic disk drive system for writing data into a disk-shaped magnetic medium and reading data stored therein, comprises a first terminal, a second terminal, and at least one third terminal, a composite head unit including an inductive write head and a... | 01/27/1998 |
| 5576915 | Magnetoresistive head with antiferromagnetic sublayers interposed between first and second spin-valve units to exchange bias inner magnetic films thereof A magnetoresistive head includes an antiferromagnetic portion interposed between first and second spin-valve units. Sense current supply directions through the first and second spin-valve units are perpendicular to a head facing surface of a magnetic reco... | 11/19/1996 |
| 5461527 | Magneto-resistive head A member having a first and a second magnetic layer are magnetostatically coupled and laminated and the first magnetic layer formed on a magneto-resistive element, for creating the exchange coupling on the magneto-resistive element and the first magnetic ... | 10/24/1995 |
| 5329413 | Magnetoresistance sensor magnetically coupled with high-coercive force film at two end regions A magnetoresistance sensor of this invention is designed to detect a magnetic field on the basis of a change in electric resistance of a magnetoresistance layer, and includes a substrate, the magnetoresistance layer, a magnetization stabilizing layer for ... | 07/12/1994 |
| 5304975 | Magnetoresistance effect element and magnetoresistance effect sensor A magnetoresistance effect element includes a multilayer obtained by stacking magnetic and nonmagnetic layers to exhibit a magnetoresistance effect, and an reversal assist layer formed on the multilayer to assist reversal of a magnetic moment of the magne... | 04/19/1994 |
