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268 results about "Hexagonal ferrite" patented technology
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Magnetic recording medium
ActiveUS20140272474A1Increased durabilityReduce runningRecord information storageMaterials with non-metallic substancesScanning electron microscopeElectron microscope
An aspect of the present invention relates to a magnetic recording medium, which comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder comprising 3 to 12 weight percent of Al, based on Al2O3 conversion, relative to 100 weight percent of a total weight of the powder, the magnetic layer further comprises abrasive, and a maximum plan view surface area of the abrasive as determined for a 4.3 μm×6.3 μm rectangular region of the magnetic layer by a scanning electron microscope is less than 0.06 percent relative to 100 percent of a total surface area of the region.
Owner:FUJIFILM CORP
Hexagonal ferrite magnetic particle and method of manufacturing the same, and magnetic recording medium
ActiveUS20110244272A1Improve coercive forceReduce particlesMaterial nanotechnologyMagnetic materials for record carriersHeat treatedMaterials science
An aspect of the present invention relates to a method of manufacturing a hexagonal ferrite magnetic particle comprising melting an Al-containing starting material mixture to prepare a melt and quenching the melt to obtain an amorphous material; subjecting the amorphous material to heat treatment to cause a hexagonal ferrite magnetic particle to precipitate in a product obtained by the heat treatment; collecting a hexagonal ferrite magnetic particle by subjecting the product to treatment with an acid and washing, wherein the hexagonal ferrite magnetic particle collected has a particle size ranging from 15 to 30 nm, comprises 0.6 to 8.0 weight percent of Al, based on Al2O3 conversion, relative to a total weight of the particle, and Al adheres to a surface of the hexagonal ferrite magnetic particle.
Owner:FUJIFILM CORP
Magnetic tape
Provided is a magnetic tape in which ferromagnetic powder included in a magnetic layer is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, and an abrasive, a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %, and a tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to the surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00.
Owner:FUJIFILM CORP
Method of manufacturing hexagonal ferrite magnetic powder, magnetic recording medium and method of manufacturing the same
ActiveUS20120244387A1Good dispersionReduce dispersion loadMagnetic materials for record carriersIron organic compoundsMagnetic liquidsSolvent
An aspect of the present invention relates to a method of manufacturing hexagonal ferrite magnetic powder. The method of manufacturing hexagonal ferrite magnetic powder comprises wet processing hexagonal ferrite magnetic particles obtained following acid treatment in a water-based solvent to prepare an aqueous magnetic liquid satisfying relation (1) relative to an isoelectric point of the hexagonal ferrite magnetic particles: pH0−pH*≧2.5, wherein, pH0 denotes the isoelectric point of the hexagonal ferrite magnetic particles and pH* denotes a pH of the aqueous magnetic liquid, which is a value of equal to or greater than 2.0, adding a surface-modifying agent comprising an alkyl group and a functional group that becomes an anionic group in the aqueous magnetic liquid to the aqueous magnetic liquid to subject the hexagonal ferrite magnetic particles to a surface-modifying treatment, and removing the water-based solvent following the surface-modifying treatment to obtain hexagonal ferrite magnetic particles.
Owner:FUJIFILM CORP
Magnetic tape device and magnetic reproducing method
ActiveUS20180286442A1Improve smoothnessImprove surface smoothnessMaterials with ironRecord information storageIn planeX-ray
The magnetic tape device includes a TMR head (reproducing head); and a magnetic tape including a magnetic layer including ferromagnetic hexagonal ferrite powder, a binding agent, and fatty acid ester, in which an XRD intensity ratio obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical direction squareness ratio is 0.65 to 1.00, Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, full widths at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic layer before and after performing a vacuum heating with respect to the magnetic tape are greater than 0 nm and equal to or smaller than 7.0 nm, and a difference between spacings before and after the vacuum heating is greater than 0 nm and equal to or smaller than 8.0 nm.
Owner:FUJIFILM CORP
Magnetic tape and magnetic tape device
ActiveUS10074393B2Improve accuracyExact reproductionMaterials with ironAlignment for track following on tapesMagnetic force microscopeMagnetic tension force
The magnetic tape includes a magnetic layer having ferromagnetic powder and a binder on a non-magnetic support, in which the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3, and an edge shape of the timing-based servo pattern specified by a magnetic force microscope observation is a shape in which a difference (l99.9−l0.1) between a value l99.9 of a cumulative frequency function of 99.9% of a position deviation width from an ideal shape in a longitudinal direction of the magnetic tape and a value l0.1 of the cumulative frequency function of 0.1% thereof is equal to or smaller than 180 nm.
Owner:FUJIFILM CORP
Magnetic recording medium and magnetic recording and reproducing device
ActiveUS20190103131A1Excellent electromagnetic conversion characteristicAvoid it happening againDisposition/mounting of recording headsMagnetic materials for record carriersIn planeX-ray
Provided are a magnetic recording medium, in which a magnetic layer includes ferromagnetic hexagonal ferrite powder, a binding agent, and an oxide abrasive, an intensity ratio Int(110) / Int(114) obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic recording medium is 0.65 to 1.00, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the magnetic layer is equal to or smaller than 0.050, and an average particle diameter of the oxide abrasive obtained from a secondary ion image obtained by irradiating the surface of the magnetic layer with a focused ion beam is 0.04 μm to 0.08 μm, and a magnetic recording and reproducing device including this magnetic recording medium.
Owner:FUJIFILM CORP
Magnetic tape and method of manufacturing the same, and magnetic recording device
ActiveUS20120243120A1Improve thermal stabilityImprove signal-to-noise ratioMagnetic materials for record carriersFilamentary/web record carriersDemagnetizing fieldMagnetic tape
Owner:FUJIFILM CORP
Magnetic recording medium and magnetic recording and reproducing device
ActiveUS20190103133A1Excellent electromagnetic conversion characteristicAvoid it happening againMaterials with ironBase layers for recording layersIn planeX-ray
Provided are a magnetic recording medium, in which a magnetic layer includes a ferromagnetic hexagonal ferrite powder, a binding agent, an oxide abrasive, an intensity ratio Int(110) / Int(114) obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio is 0.65 to 1.00, one or more kinds of component selected from the group consisting of fatty acid and fatty acid amide is contained in a magnetic layer side portion on the non-magnetic support, a C—H derived C concentration of the magnetic layer is 45 atom % to 65 atom %, and an average particle diameter of the oxide abrasive obtained from a secondary ion image obtained by irradiating the surface of the magnetic layer with a focused ion beam is 0.04 μm to 0.08 μm, and a magnetic recording and reproducing device including this magnetic recording medium.
Owner:FUJIFILM CORP
Magnetic recording medium and magnetic recording and reproducing device
ActiveUS20190103135A1Excellent electromagnetic conversion characteristicAvoid it happening againManufacture head surfaceRecord information storageIn planeX-ray
Provided are a magnetic recording medium, in which a magnetic layer includes a ferromagnetic hexagonal ferrite powder, a binding agent, and an oxide abrasive, an intensity ratio Int(110) / Int(114) obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic recording medium is 0.65 to 1.00, a contact angle with respect to 1-bromonaphthalene measured regarding a surface of the magnetic layer is 50.0° to 55.0°, and an average particle diameter of the oxide abrasive obtained from a secondary ion image obtained by irradiating the surface of the magnetic layer with a focused ion beam is 0.04 μm to 0.08 μm, and a magnetic recording and reproducing device including this magnetic recording medium.
Owner:FUJIFILM CORP
Magnetic recording medium and magnetic recording and reproducing device
ActiveUS20190103134A1Excellent electromagnetic conversion characteristicAvoid it happening againMaterials with ironProtective coatings for layersIn planeX-ray
Provided are a magnetic recording medium, in which a magnetic layer includes ferromagnetic hexagonal ferrite powder, a binding agent, and an oxide abrasive, an intensity ratio Int(110) / Int(114) obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic recording medium is 0.65 to 1.00, a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30, and an average particle diameter of the oxide abrasive obtained from a secondary ion image obtained by irradiating the surface of the magnetic layer with a focused ion beam is 0.04 μm to 0.08 μm, and a magnetic recording and reproducing device including this magnetic recording medium.
Owner:FUJIFILM CORP
Magnetic tape
ActiveUS20160276076A1Maintain wear resistanceMaintenance of such surfaceInorganic material magnetismRecord information storageMagnetic tapeTransmission microscopy
The magnetic tape includes a magnetic layer containing ferromagnetic hexagonal ferrite powder, abrasive, and binder on a nonmagnetic support, wherein the ferromagnetic hexagonal ferrite powder exhibits an activation volume of less than or equal to 1,800 nm3, and inclination, cos θ, of the ferromagnetic hexagonal ferrite powder relative to a surface of the magnetic layer as determined by sectional observation by a scanning electron transmission microscope is greater than or equal to 0.85 but less than or equal to 1.00.
Owner:FUJIFILM CORP
Magnetic tape device and magnetic reproducing method
ActiveUS20180286449A1Improve signal-to-noise ratioIncrease recording capacityRecord information storageManufacture of flux-sensitive headsMagnetic tapeX-ray
The magnetic tape device includes a magnetic tape and a TMR head, in which the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00.
Owner:FUJIFILM CORP
Magnetic tape
ActiveUS9704525B2Maintain wear resistanceMaintenance of such surfaceMagnetic materials for record carriersRecord information storageMagnetic tapeTransmission microscopy
Owner:FUJIFILM CORP
Magnetic tape and magnetic tape device
ActiveUS20180374507A1Improve accuracyExact reproductionMaterials with ironAlignment for track following on tapesIn planeMagnetic force microscope
The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3, an XRD intensity ratio Int(110) / Int(114) obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, and an edge shape of the timing-based servo pattern specified by magnetic force microscope observation is a shape in which a difference (L99.9−L0.1) is equal to or smaller than 180 nm, and a magnetic tape device including the magnetic tape.
Owner:FUJIFILM CORP
Magnetic recording medium
InactiveUS20130084470A1Good running durabilityGood dispersionMagnetic materials for record carriersRecord information storageInorganic particleNon magnetic
An aspect of the present invention relates to a magnetic recording medium comprising a magnetic layer containing a ferromagnetic powder and a binder on a nonmagnetic support, wherein the ferromagnetic powder has a hexagonal ferrite structure, the magnetic layer comprises a coefficient of friction-lowering component in the form of nonmagnetic inorganic particles, and a compound in which a substituent selected from the group consisting of a hydroxyl group and a carboxyl group is directly substituted on an aromatic ring.
Owner:FUJIFILM CORP
Magnetic tape device and magnetic reproducing method
ActiveUS20180286450A1Improve smoothnessImprove surface smoothnessMaterials with ironRecord information storageIn planeX-ray
The magnetic tape device includes a magnetic tape including a magnetic layer; and a TMR head (reproducing head), in which an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, and a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %.
Owner:FUJIFILM CORP
Magnetic tape and method of manufacturing the same, and magnetic recording device
ActiveUS8681451B2Improve thermal stabilityImprove signal-to-noise ratioMagnetic materials for record carriersFilamentary/web record carriersDemagnetizing fieldMagnetic tape
An aspect of the present invention relates to a magnetic tape comprising a magnetic layer containing a ferromagnetic powder and a binder on a nonmagnetic support, whereinthe ferromagnetic powder is a hexagonal ferrite powder,squareness in a vertical direction without demagnetizing field correction of the magnetic layer ranges from 0.6 to 1.0, andthe magnetic layer further comprises a compound in which a substituent selected from the group consisting of a carboxyl group and a hydroxyl group is directly substituted into a ring structure comprising a double bond and having a ClogP falling within a range of 2.3 to 5.5.
Owner:FUJIFILM CORP
Magnetic tape and magnetic tape device
ActiveUS20170372742A1Restrain output decreaseImprove accuracyBase layers for recording layersAlignment for track following on tapesMagnetic tapeElectron microscope
The magnetic tape includes a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binder on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer, in which the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer includes an abrasive, and a tilt cos η of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00.
Owner:FUJIFILM CORP
Magnetic tape device and head tracking servo method
ActiveUS20180240481A1Lower the resistance valueAvoid it happening againAlignment for track following on tapesTape carriersX-rayEngineering
The magnetic tape device includes a TMR head as a servo head; and a magnetic tape which includes a magnetic layer including ferromagnetic hexagonal ferrite powder and a binding agent, and including a servo pattern, an XRD intensity ratio (Int(110) / Int(114)) of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, and a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050.
Owner:FUJIFILM CORP
Magnetic tape
ActiveUS20180061446A1Deterioration of characteristicMagnetic materials for record carriersTape carriersConventional transmission electron microscopeScanning tunneling microscope
Provided is a magnetic tape in which the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer includes ferromagnetic hexagonal ferrite powder and an abrasive, a percentage of a plan view maximum area of the abrasive confirmed in a region having a size of 4.3 μm×6.3 μm of the surface of the magnetic layer by plane observation using a scanning electron microscope, with respect to the total area of the region is equal to or greater than 0.02% and less than 0.06%, and a tilt cos 0 of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00.
Owner:FUJIFILM CORP
Magnetic recording medium
ActiveUS6994925B2High outputRaise the ratioMagnetic materials for record carriersRecord information storageNon magneticLength wave
To provide a magnetic recording medium which undergoes little effect of thermal fluctuation and provides a high short wavelength output and C / N ratio when reproduction is conducted using MR head, the magnetic recording medium includes a non-magnetic layer having a non-magnetic powder dispersed in a binder provided on a support and a magnetic layer having a ferromagnetic powder dispersed in a binder provided on the non-magnetic layer, wherein the ferromagnetic powder comprises a hexagonal ferrite magnetic powder having an average diameter of from 10 to 35 nm and a coercive force of from 135 to 400 kA / m; the magnetic layer has a coercive force of from 135 to 440 kA / m; and a product of an anisotropic magnetic field of the magnetic layer and an average particle volume of the hexagonal ferrite magnetic powder is from 1.2×106 to 2.4×106 kA / m·nm3.
Owner:FUJIFILM HLDG CORP +1
Magnetic tape and magnetic tape device
ActiveUS20170372736A1Improve surface smoothnessDefect signalAlignment for track following on tapesTape carriersMagnetic tapeSurface roughness
The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic support, in which the total thickness of the magnetic tape is equal to or smaller than 5.30 μm, the magnetic layer includes a timing-based servo pattern, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer includes an abrasive, and a tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00.
Owner:FUJIFILM CORP
Magnetic tape device and magnetic reproducing method
ActiveUS20180240478A1Improve smoothnessImprove surface smoothnessMagnetic materials for record carriersBase layers for recording layersIn planeX-ray
The magnetic tape device includes a TMR head as a reproducing head; and a magnetic tape which includes a non-magnetic support, and a magnetic layer including ferromagnetic hexagonal ferrite powder and a binding agent on the non-magnetic support, an XRD intensity ratio (Int(110) / Int(114)) of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, and a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050.
Owner:FUJIFILM CORP
Magnetic recording medium
ActiveUS9530444B2Increased durabilityReduce runningMagnetic materials for record carriersRecord information storageScanning electron microscopeElectron microscope
Owner:FUJIFILM CORP
Hexagonal ferrite magnetic particles, magnetic recording powder, and magnetic recording medium
ActiveUS20140295214A1High densityReduce noiseMaterials with ironIron oxides/hydroxidesThermal stabilityBiological activation
Hexagonal ferrite magnetic particles have an activation volume ranging from 1,000 nm3 to 1,500 nm3, and ΔE10% / kT, thermal stability at 10% magnetization reversal, is equal to or greater than 40.
Owner:FUJIFILM CORP
Magnetic tape device and magnetic reproducing method
InactiveUS20180182427A1Avoid it happening againAvoiding characteristicFilamentary/web record carriersTape carriersMagnetic tapeElectron microscope
The magnetic tape device includes: a magnetic tape; and a reproducing head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m / sec, the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic hexagonal ferrite powder, non-magnetic powder, and a binding agent on the non-magnetic support, and a tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 0.95.
Owner:FUJIFILM CORP
Magnetic particle and method of preparing the same, and magnetic recording medium
Owner:FUJIFILM CORP
Magnetic recording medium
ActiveUS7515383B2Disposition/mounting of recording headsMagnetic materials for record carriersHigh densityMetallurgy
Owner:FUJIFILM CORP
Magnetic tape and method of manufacturing the same
ActiveUS20170186456A1Increase frictionImprove featuresRecord information storageTape carriersMagnetic tapeMagnetization
The magnetic tape has a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support and a magnetic layer containing ferromagnetic powder and binder on the nonmagnetic layer, wherein a fatty acid ester is contained in at least the magnetic layer, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the ferromagnetic hexagonal ferrite powder has a crystallite volume as determined by X-ray diffraction analysis ranges from 1,000 nm3 to 2,400 nm3, and a ratio of the crystallite size Dx(107) obtained from a diffraction peak of a (107) plane to a particle size in a direction of an easy axis of magnetization DTEM as determined by observation with a transmission electron microscope, Dx(107) / DTEM, is greater than or equal to 1.1, and ΔSFD in a longitudinal direction of the magnetic tape as calculated with Equation 1: ΔSFD=SFD25° C.−SFD−190° C., ranges from 0.50 to 1.60.
Owner:FUJIFILM CORP
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