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5752 results about "Recording head" patented technology
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A recording head is the physical interface between a recording apparatus and a moving recording medium. Recording heads are generally classified according to the physical principle that allows them to impress their data upon their medium. A recording head is often mechanically paired with a playback head, which, though proximal to, is often discrete from the record head.
Ink-jet recording head with piezoelectric device and method for manufacturing the same
InactiveUS6142615AIncrease in piezoelectric constantIncrease the driving voltagePiezoelectric/electrostrictive device manufacture/assemblyPiezoelectric/electrostrictive device material selectionPiezoelectric actuatorsPiezoelectric coefficient
A piezoelectric device for an ink jet print head that has a greater displacement at a low drive voltage. The ink-jet recording head includes a vibration plate, on which is mounted one or more piezoelectric devices that change the volumes of pressure chambers upon application of a voltage. The device is mounted at least on one face of a pressure chamber substrate that is to be filled with ink. Such piezoelectric device includes a second piezoelectric layer having a piezoelectric constant g of a constant value or higher; and a first piezoelectric layer having a dielectric constant of a specific value or higher. Since the piezoelectric constant d of the piezoelectric device correlates with the product of the largest piezoelectric constant g and the largest dielectric device of the piezoelectric devices, a piezoelectric constant d larger than in the conventional case, i.e., having a greater displacement, can be obtained.
Owner:SEIKO EPSON CORP
Near-field optical transducers for thermal assisted magnetic and optical data storage
ActiveUS7330404B2Recording by magnetic meansRecord information storageSurface plasmonRefractive index
An optical transducer comprises an optical element for directing an electromagnetic wave to a focal region and a metallic nano-structure having a longitudinal axis substantially parallel to an electric field of the electromagnetic wave, the metallic nano-structure being positioned outside of the optical element, wherein the electromagnetic wave produces surface plasmons on the metallic nano-structure. A cladding material having a refractive index differing from the refractive index of the optical element can be positioned adjacent to a surface of the metallic nano-structure. Magneto-optical recording heads that include the transducers and disc drives that include the magneto-optical recording heads are also included.
Owner:SEAGATE TECH LLC
Magnetic recording head with resistive heating element located near the write coil
InactiveUS7372665B1Disposition/mounting of recording headsRecord information storageTransducerTrailing edge
A magnetic head includes a slider body having a trailing surface meeting an air-bearing surface at a trailing edge, with a thin-film transducer disposed on the trailing surface of the slider body near the trailing edge. The thin-film transducer includes a coil embedded between first and second poles. A resistive heating element is disposed adjacent and electrically insulated from, the coil. Application of power to the resistive heating element causes expansion of at least the first and second poles.
Owner:WESTERN DIGITAL TECH INC
Method and system for mounting lasers on energy assisted magnetic recording heads
A method and system for providing energy assisted magnetic recording (EAMR) heads including EAMR transducers are described. The method and system include aligning a laser bar to the EAMR heads on a substrate. The laser bar includes lasers in locations corresponding to a portion of the EAMR transducers. The method and system also include bonding the laser bar to the substrate and removing a portion of the laser bar to separate the plurality of lasers. The substrate is separated into the EAMR heads.
Owner:WESTERN DIGITAL TECH INC
Damascene process for fabricating poles in recording heads
A method and system for manufacturing a pole for a magnetic recording head. The method and system include providing an insulator and fabricating at least one hard mask on the insulator. The at least one hard mask has an aperture therein. The method and system also include removing a portion of the insulator to form a trench within the insulator. The trench is formed under the aperture. The method and system further include depositing at least one ferromagnetic material. The pole includes a portion of the ferromagnetic material within the trench.
Owner:WESTERN DIGITAL TECH INC
Perpendicular magnetic recording head with dynamic flying height heating element
ActiveUS7430098B1Disposition/mounting of recording headsRecord information storageTransducerFlying height
A magnetic head includes a slider having an air bearing surface (ABS) and a trailing surface, with a transducer fabricated on the trailing surface. The transducer includes an adjunct pole disposed in a first general plane, the adjunct pole having a front edge that is recessed from the ABS and a rear edge. A main pole of the transducer is formed adjacent the adjunct pole, the main pole having a write tip that extends approximately to the ABS. A write coil having a first layer of turns is disposed in a second general plane below the adjunct pole. The magnetic head further includes a heating element, a portion of the heating element being disposed in the first general plane behind the rear edge of the adjunct pole.
Owner:WESTERN DIGITAL TECH INC
Hybrid diffuser for minimizing thermal pole tip protrusion and reader sensor temperature
InactiveUS6859343B1Reduces reader sensor temperatureImprove thermal conductivityManufacture head surfaceRecord information storageInvarInsulation layer
An enchance recording head design provides conduction and mechanical restraint control in order to minimize the pole tip protrusion and the head temperature resulting from the thermal heating of the magnetic recording head during operation. In one embodiment, the recording head includes a hybrid diffuser formed within an insulation layer, at a predetermined distance from the head write section. The hybrid diffuser is comprised of a thermal conduction layer with high thermal conductivity, such as gold or copper, and a mechanical restraint layer having near zero CTE, such as a 60-80% face-centered-cubic NiFe (Invar) material. The hybrid diffuser is recessed from the ABS to prevent the delamination of the hybrid diffuser due to the otherwise displacement incompatibility between the inner insulating layer and the hybrid diffuser at the ABS.
Owner:WESTERN DIGITAL TECH INC
Four pad self-calibrating electronic lapping guide
Lapping guides for use in fabrication of a magnetic recording head are provided. The lapping guides comprise a first differential electronic lapping guide (ELG) disposed in a first layer of the magnetic recording head. The first differential ELG has a first resistive element and a second resistive element between which is disposed a first common electrical lead. The lapping guides further comprise a second differential ELG disposed in a second layer of the magnetic recording head. The second differential ELG has a third resistive element and a fourth resistive element between which is disposed a second common electrical lead. The first and second differential ELGs share a common ground and a common current injection source. Remaining lapping distances at the first and second layers of the magnetic recording head are determined by measuring changing voltages across the first, second, third and fourth resistive elements, respectively.
Owner:WESTERN DIGITAL TECH INC
Shielded pole magnetic head for perpendicular recording
A read / write head for use in a perpendicular magnetic recording head in a data storage system. The read / write head includes a write section that is comprised of a first pole layer, a second pole layer, a third pole layer, and a shield layer. The third pole layer defines a write pole tip, and the third pole layer and the shield layer are separated from each other to define a write gap therebetween. At least part of the shield layer has a generally uniform width, and wherein the write pole tip defines a track width that is substantially equal to the uniform width of the shield layer. According to one embodiment the entire shield layer has a generally uniform width that is substantially equal to the track width. According to another embodiment, the shield layer includes a lower section and an upper section, wherein the lower section has a generally uniform width along its entire length, and wherein the upper section is wider than the lower section.
Owner:WESTERN DIGITAL TECH INC
Method for manufacturing a shielded pole magnetic head for perpendicular recording
ActiveUS7337530B1Electrical transducersHeads using thin filmsEngineeringElectrical and Electronics engineering
Owner:WESTERN DIGITAL TECH INC
Method and system for providing an energy assisted magnetic recording head in a wafer packaging configuration
A method and system for providing energy assisted magnetic recording (EAMR) heads are described. The heads include sliders having leading and trailing edges. An EAMR transducer for each head is fabricated on a front face of a substrate that corresponds to the trailing edge of the slider. An overcoat layer that includes transducer and laser contact(s) is provided on the transducer. A laser for providing light to the transducer is provided on each slider. The laser is electrically coupled to the laser contact(s) and electrically insulated from at least part of the transducer contacts. The laser is enclosed in a capping layer, which has a laser-facing surface including a laser cavity, via(s), a trailing surface, and pads on the trailing surface. The laser cavity encloses the laser between the overcoat and capping layers. The via(s) provide electrical connection to the transducer contacts. The substrate is separated into the heads.
Owner:WESTERN DIGITAL TECH INC
Magnetic recording head with resistive heating element located near the write coil
Owner:WESTERN DIGITAL TECH INC
Write head with variable side shield gaps
ActiveUS8400731B1Improved cross-track field gradientHigh gradientManufacture head surfaceRecord information storageLeading edgeEngineering
A magnetic recording head comprises a write pole including a throat region with a leading edge, a trailing edge opposite the leading edge, and first and second side edges opposite one another. The magnetic recording head further comprises a first side wall gap layer disposed alongside the first side edge of the throat region, and a second side wall gap layer disposed alongside the second side edge of the throat region. Each of the first and second side wall gap layers has a first width at the leading edge of the throat region smaller than a second width at the trailing edge of the throat region.
Owner:WESTERN DIGITAL TECH INC
Reducing thermal protrusion of a near field transducer in an energy assisted magnetic recording head
ActiveUS8077418B1Preventing protrusion-related damageImprove reliabilityCombination recordingElectrical transducersTransducerOptical power
Methods of fabricating an energy-assisted magnetic recording (EAMR) head to compensate for a heat-induced protrusion of a near field transducer formed therein are disclosed. The methods can include applying optical power to the near field transducer to generate heat therein. The near field transducer protrudes beyond an air bearing surface of the EAMR head by the generated heat. The methods can further include removing a protruded portion of the near field transducer.
Owner:WESTERN DIGITAL TECH INC
Method and system for providing a transducer having dual, ABS recessed auxiliary poles on opposite sides of a main pole with non-magnetic spacer adjoining back portion of main pole and positioned between auxiliary poles
A method and system for providing a magnetic recording head is described. The magnetic recording head has an ABS configured to reside in proximity to a media during use. The magnetic recording head includes a main pole, first and second auxiliary poles, a backgap, a nonmagnetic spacer, and at least one coil. The main pole includes a pole tip occupying a portion of the ABS and a back edge distal from the ABS. Each auxiliary pole has a front recessed from the ABS and a back portion. A portion of the main pole distal from the ABS resides between the auxiliary poles. The auxiliary poles are magnetically coupled with the main pole. The backgap magnetically couples the back portions of the auxiliary poles. The nonmagnetic spacer adjoins the back edge of the main pole and is between the auxiliary poles. The coil(s) energize the main pole.
Owner:WESTERN DIGITAL TECH INC
System and method for minimizing thermal pole tip protrusion
InactiveUS7035046B1Minimize pole tip protrusionSimple designRecord information storageProtective measures for recording headsInvarDiffusion
An enhanced recording head design provides thermal diffusion and thermal expansion control in order to minimize the pole tip protrusion resulting from the thermal heating of the magnetic recording head during operation. In one embodiment, the recording head a thermal restraint section formed above a write section, and is made of a 60–80% face-centered-cubic NiFe (Invar) material. According to another embodiment, the thermal restraint section is formed under the read section. According to yet another embodiment, one thermal restraint section is formed above the write section, and another thermal restraint section formed under the read section.
Owner:WESTERN DIGITAL TECH INC
Perpendicular magnetic recording head with dynamic flying height heating element disposed below turns of a write coil
ActiveUS7729086B1Disposition/mounting of recording headsRecord information storageTransducerFlying height
Owner:WESTERN DIGITAL TECH INC
Method for manufacturing a perpendicular magnetic recording head
InactiveUS7296339B1Construction of head windingsElectrical transducersEngineeringChemical-mechanical planarization
A method and system for manufacturing a perpendicular magnetic recording head is disclosed. The method and system include providing a chemical mechanical planarization (CMP) uniformity structure having an aperture therein and forming a perpendicular magnetic recording pole within the aperture. The CMP uniformity structure may include a CMP barrier layer. The method and system further include fabricating an insulator after formation of the perpendicular magnetic recording pole and performing a CMP to remove a portion of the insulator, expose a portion of the perpendicular magnetic recording pole and planarize an exposed surface of the perpendicular magnetic recording head.
Owner:WESTERN DIGITAL TECH INC
System for providing a transducer having a main coil and an additional coil separated from the main pole by a write shield
A method and system for providing a magnetic recording head is described. The magnetic recording head has an air-bearing surface (ABS) configured to reside in proximity to a media during use. The head includes a first coil, a second coil, a main pole, and a third coil. The first coil has a first plurality of turns and is configured to carry a first write current in a first direction. The second coil has a second plurality of turns and is configured to carry a second write current in a second direction. The main pole is between the first coil and the second coil. The third coil has a third plurality of turns configured to carry a third write current in a third direction.
Owner:WESTERN DIGITAL TECH INC
Magnetic recording head formed by damascene process
InactiveUS8018677B1Record information storageHeads for perpendicular magnetisationsHard maskElectrical and Electronics engineering
A method and system for manufacturing a pole for a magnetic recording head. The method and system include providing an insulator and fabricating at least one hard mask on the insulator. The at least one hard mask has an aperture therein. The method and system also include removing a portion of the insulator to form a trench within the insulator. The trench is formed under the aperture. The method and system further include depositing at least one ferromagnetic material. The pole includes a portion of the ferromagnetic material within the trench.
Owner:WESTERN DIGITAL TECH INC
Magnetic recording head for perpendicular recording, fabrication process, and magnetic disk storage apparatus mounting the magnetic head
InactiveUS20050141137A1Improving recording magnetic field gradientIncreasing the thicknessManufacture head surfaceHeads using thin filmsMagnetic field gradientMagnetic media
Embodiments of the invention provide a perpendicular magnetic writing head with a suppressed effective track width to be written on a magnetic medium while increasing writing magnetic field gradient. In one embodiment a trailing side shield is disposed by way of a gap film to a main pole of a perpendicular writing magnetic head. A gap distance (Gt) on a trailing side of the main pole and a gap distance (Gs) on a lateral side of the main pole is defined as Gt<Gt, and a thickness (Gd) from an air bearing surface of the shield is made equal to or less than a throat height. Alternatively, the thickness of Gd on the side of the main pole is reduced to less than that on the trailing side of the main pole. Further, for preventing defoliation of the shield upon fabrication of the air bearing surface, a thickness for a portion away from the main pole is increased.
Owner:HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
Method and system for fabricating a narrow line structure in a magnetic recording head
A method for fabricating a structure in magnetic recording head is described. First and second hard mask layers are provided on the layer(s) for the structure. A BARC layer and photoresist mask having a pattern are provided on the second hard mask layer. The pattern includes a line corresponding to the structure. The pattern is transferred to the BARC layer and the second hard mask layer in a single etch using an etch chemistry. At least the second hard mask layer is trimmed using substantially the same first etch chemistry. A mask including a hard mask line corresponding to the line and less than thirty nanometers wide is thus formed. The pattern of the second hard mask is transferred to the first hard mask layer. The pattern of the first hard mask layer is transferred to the layer(s) such that the structure has substantially the width.
Owner:WESTERN DIGITAL TECH INC
Straight top main pole for PMR bevel writer
ActiveUS8254060B1Record information storageHeads with metal sheet coresEngineeringMechanical engineering
A magnetic recording head includes a write pole comprising a throat region. The throat region includes a lower portion having a substantially trapezoidal cross-section, and an upper portion having a substantially rectangular cross-section. In a beveled region of the write pole, the substantially rectangular cross-section of the upper portion decreases in height towards an air bearing surface of the magnetic recording head.
Owner:WESTERN DIGITAL TECH INC
Method and system for manufacturing tapered waveguide structures in an energy assisted magnetic recording head
A method for providing waveguide structures for an energy assisted magnetic recording (EAMR) transducer is described. The waveguide structures have a plurality of widths. At least one waveguide layer is provided. Mask structure(s) corresponding to the waveguide structures and having a pattern are provided on the waveguide layer(s). The mask structure(s) include a planarization stop layer, a planarization assist layer on the planarization stop layer, and a hard mask layer on the planarization assist layer. The planarization assist layer has a low density. The pattern of the mask structure(s) is transferred to the waveguide layer(s). Optical material(s) that cover the waveguide layer(s) and a remaining portion of the mask structure(s) are provided. The optical material(s) have a density that is at least twice the low density of the planarization assist layer. The method also includes performing a planarization configured to remove at least a portion of the optical material(s).
Owner:WESTERN DIGITAL TECH INC
Magnetic recording head and magnetic recording apparatus
ActiveUS20080304176A1Disposition/mounting of recording headsRecord information storageAntiferromagnetic couplingMagnetic poles
A magnetic recording head includes a recording magnetic pole, and a spin oscillation device including a first magnetic layer having at least one magnetic material layer, a second magnetic layer having at least one magnetic material layer, and a first nonmagnetic layer provided between the first magnetic layer and the second magnetic layer. The first magnetic layer and the second magnetic layer are antiferromagnetically coupled and / or magnetostatically coupled to each other. The first magnetic layer and the second magnetic layer are laminated in a direction generally parallel to a medium facing surface and generally parallel to a side surface of the recording magnetic pole intersecting with the medium facing surface.
Owner:KK TOSHIBA
Magnetic sensor, magnetic field sensing method, semagnetic recording head, and magnetic memory device
ActiveUS20050219771A1Modification of read/write signalsNanomagnetismFrequency filteringMagnetization
A magnetic sensor includes a magnetoresistance element having a peak of a thermal fluctuation strength of magnetization under a magnetic field having a certain frequency, a frequency filter connected to the magnetoresistance element and having its transmittance decreased or increased in substantially the frequency of the magnetic field to output a signal corresponding substantially to the peak of the thermal fluctuation strength of magnetization, and a detector connected to the frequency filter to detect the magnetic field based on the signal of the frequency filter.
Owner:KK TOSHIBA
Energy-assisted magnetic recording head having multiple cores of different lengths
A method and system for providing a waveguide for an energy assisted magnetic recording (EAMR) transducer is described. The EAMR transducer has an air-bearing surface (ABS) that resides in proximity to a media during use and is coupled with a laser that provides energy. The EAMR transducer includes a write pole that writes to a region of the media and coil(s) that energize the write pole. The waveguide includes first and second cladding layers, a core, and assistant cores. The core is configured to direct the energy from the laser toward the ABS and has a core length. The core resides between the first and second cladding layers. A first portion of the assistant cores resides in the first cladding layer. A second portion of the assistant cores is in the second cladding layer. Each assistant core has an assistant core length less than the core length.
Owner:WESTERN DIGITAL TECH INC
High-frequency oscillation element, magnetic information recording head, and magnetic storage device
ActiveUS20050023938A1Increase temperatureIncrease speedPiezoelectric/electrostriction/magnetostriction machinesSolid-state devicesMagnetic storageResonance
A high-frequency oscillation element has a ferromagnetic material which exhibits thermal fluctuation of magnetization and generates spin fluctuations in conduction electrons, a nonmagnetic conductive material which is laminated on the first magnetic material and transfers the conduction electrons, a magnetic material which is laminated on the nonmagnetic conductive material, generates magnetic resonance upon injection of the conduction electrons, and imparts magnetic dipole interaction to magnetization of a neighboring magnetic area by means of magnetic vibration stemming from the magnetic resonance, a first electrode electrically coupled with the first magnetic material, and a second electrode electrically coupled with the second magnetic material.
Owner:KK TOSHIBA
Method and system for improving laser alignment and optical transmission efficiency of an energy assisted magnetic recording head
ActiveUS8681594B1Reduce back reflectionRecord information storageOptical beam guiding meansTransducerWaveguide
An EAMR disk drive includes a media, a laser, and a slider coupled with the laser. The laser for provides energy. The slider has an air-bearing surface, a laser input side, an EAMR transducer and an antireflective coating (ARC) layer occupying a portion of the laser input side. The ARC layer is configured to reduce back reflections of the energy. The EAMR transducer includes a write pole, a waveguide optically coupled with the laser and at least one coil. The waveguide has a waveguide input. A portion of the ARC layer resides between the laser and the waveguide input. A method aligns the laser to the ARC layer, and then aligns the laser to the waveguide input. The laser may then be coupled to the slider.
Owner:WESTERN DIGITAL TECH INC
Damascene coil processes and structures
InactiveUS20100290157A1Eliminating insulation coverage problemEliminate needConstruction of head windingsDecorative surface effectsOptoelectronicsReactive-ion etching
A magnetic recording head is provided. The magnetic recording head comprises a write pole and a write coil structure configured to generate a magnetic field in the write pole. The write coil structure comprises a substrate layer and a coil material disposed within the substrate layer. The write coil structure is substantially free of photoresist. A method for forming a write coil structure is also provided. The method comprises the steps of providing a substrate layer, forming a photoresist pattern mask over the substrate layer, opening a damascene trench in the substrate layer by reactive ion etching, and disposing a coil material into the damascene trench in the substrate layer.
Owner:WESTERN DIGITAL TECH INC
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