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1869results about "Heads for perpendicular magnetisations" patented technology
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Perpendicular magnetic recording head with nonmagnetic write gap greater than twice side shield gap distance
InactiveUS6954340B2Improve writer efficiencyHigh gradientConstruction of head windingsManufacture head surfaceLeading edgeEngineering
A magnetic head for perpendicular recording on double layer media with suppressed side writing and controlled write width is disclosed. The present invention reduces the problem of side writing and controls the write width of the writing element by providing a writing element with a trailing edge sized dimensionally larger than the leading edge, side shields, and specifically spaced writing gaps placed at various distances between the write element and the side shields, return poles, and the main pole.
Owner:SEAGATE TECH LLC
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
Method and system for providing a magnetic transducer having a high moment bilayer magnetic seed layer for a trailing shield
ActiveUS8582241B1Record information storageHeads for perpendicular magnetisationsMagnetic transducersMagnetization
A method and system for providing a magnetic read transducer is described. The magnetic recording transducer includes a write pole, a nonmagnetic gap, a magnetic seed layer, a trailing shield and coil(s) that energize the write pole. The write pole is configured to write to a media. The nonmagnetic gap is between the write pole and the magnetic seed layer. The magnetic seed layer includes a high moment layer and a magnetic buffer layer. The high moment layer is between the nonmagnetic gap and the magnetic buffer layer. The high moment layer has a saturation magnetization greater than 2.3 T and a first corrosion potential. The magnetic buffer layer has a second corrosion potential less than the first corrosion potential. The magnetic seed layer is between the trailing shield and the nonmagnetic gap layer. The magnetic buffer layer is between the trailing shield and the high moment layer.
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
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
Magnetic write head with high moment magnetic thin film formed over seed layer
A magnetic write head includes a seed layer and a magnetic layer on the seed layer. The seed layer includes seed-layer grains having either a face-centered cubic (fcc) crystalline structure with a surface plane substantially oriented in a [111] direction or a hexagonal-close-packed (hcp) crystalline structure with a surface plane substantially oriented in a [0001] direction. The magnetic layer includes magnetic-layer grains having a body-centered-cubic (bcc) crystalline structure with a surface plane substantially oriented in a [110] direction.
Owner:WESTERN DIGITAL TECH INC
Method for manufacturing a shielded pole magnetic head for perpendicular recording
ActiveUS7337530B1Electrical transducersHeads using thin filmsEngineeringElectrical and Electronics engineering
A method of making a perpendicular magnetic recording head for use in a data storage device includes forming a first pole layer, a second pole layer, a third pole layer, and a shield layer of a write section. The first pole layer, second pole layer, third pole layer, and shield layer are formed without using a chemical mechanical polishing process. The method next includes concurrently trimming the shield layer and a write pole that is defined by the third pole layer to a predetermined track width. In the trimming step, the shield layer is used as a mask for the write pole.
Owner:WESTERN DIGITAL TECH INC
Pole tip with sides flared at media-facing surface
InactiveUS7133253B1Record information storageHeads for perpendicular magnetisationsTransducerEngineering
A thin film electromagnetic head has an inductive transducer with a ferromagnetic pole layer terminating adjacent a media-facing surface at a pole tip surface. The pole layer has side surfaces each having an end region that meets the pole tip surface, the end regions increasingly separated with increasing distance from the pole tip surface. Having a pole layer that is tapered to the point at which it meets the pole tip surface channels flux more efficiently for writing on-track as opposed to off-track. Such a tapered pole tip can be formed for a pair of pole layers separated by a submicron nonferromagnetic gap, or for a single perpendicular writing pole layer.
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
Method for fabricating a magnetic recording transducer having side shields
A method provides a magnetic transducer that includes an underlayer and a nonmagnetic layer on the underlayer. The method includes providing a plurality of trenches in the nonmagnetic layer. A first trench of corresponds to a main pole, while at least one side trench corresponds to at least one side shield. The method also includes providing mask covering the side trench(es) and providing the main pole. At least a portion of the main pole resides in the first trench. The method also includes removing at least a portion of the nonmagnetic layer residing between the side trench(es) and the main pole. The method also includes providing at least one side shield. The shield(s) extend from at least an air-bearing surface location to not further than a coil front location.
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
Magnetic head for perpendicular recording with hard bias structure for write pole tip
A magnetic head for writing information on a relatively-moving medium is disclosed, the head having a leading end, a trailing end and a medium-facing surface, the head comprising: a soft magnetic write pole that terminates in a pole tip that is disposed adjacent to the medium-facing surface; at least one coil section that is disposed adjacent to the write pole to induce a magnetic flux in the write pole; and a hard magnetic bias structure disposed within one micron of the pole tip to magnetically bias the pole tip.
Owner:WESTERN DIGITAL TECH INC
Write head having a recessed, magnetic adjunct pole formed atop a main pole, and method of making the same
InactiveUS6906894B2Enhanced magnetic write fieldEliminate the problemConstruction of head windingsElectrical transducersSputteringEngineering
A read / write head and method of making the same are used in a data storage system, such as a disk drive, for perpendicular magnetic recording of data. The head employs a two-layer pole design with a main pole made of sputtered high moment magnetic material, and an adjunct pole made of electroplated soft magnetic film. The main pole is used to write data onto the medium, and is formed over the write coil. The adjunct pole is substantially recessed from the air bearing surface and is formed over the main pole. The present head design significantly enhances the magnetic write field, and substantially reduces side-writing that result in accidental erasure of data in adjacent tracks on the magnetic recording medium.
Owner:WESTERN DIGITAL TECH INC
Method and system for providing separate write and optical modules in an energy assisted magnetic recording disk drive
An energy assisted magnetic recording (EAMR) transducer coupled with a laser is described. The EAMR transducer has an air-bearing surface (ABS) residing near a media during use. The EAMR transducer includes optical and writer modules. The optical module includes a waveguide and a near field transducer (NFT). The waveguide directs the energy from the laser toward the ABS. The NFT focuses the energy onto the media. The optical and writer modules are physically separate such that no portion of the waveguide is interleaved with a magnetic portion of the writer module. The writer module includes a write pole and coil(s). The write pole includes a pole-tip portion for providing a magnetic field to the media and a yoke. The pole-tip portion has an ABS-facing surface, a sloped surface, and a NFT-facing surface therebetween. The sloped surface is at least twenty-five and not more than sixty-five degrees from the NFT-facing surface.
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
MTJ incorporating CoFe/Ni multilayer film with perpendicular magnetic anisotropy for MRAM application
ActiveUS20110096443A1Minimize impinging ion energyMaximize PMA propertyMagnetic measurementsVacuum evaporation coatingSpin transferSpin valve
A MTJ for a spintronic device is disclosed and includes a thin composite seed layer made of at least Ta and a metal layer having fcc(111) or hcp(001) texture as in Ta / Ti / Cu to enhance perpendicular magnetic anisotropy (PMA) in an overlying laminated layer with a (CoFe / Ni)X, (Co / NiFe)X, (Co / NiCo)X, (CoFe / NiFe)X, or (CoFe / NiCo)X composition where x is from 5 to 30. In one embodiment, a CPP-TMR spin valve has one or both of a laminated free layer and laminated reference layer with the aforementioned compositions. The MTJ includes an interfacial layer made of CoFeB, CoFeB / CoFe, or CoFe / CoFeB between each laminated structure and the tunnel barrier. The laminated layers are deposited by a low power and high Ar pressure process to avoid damaging interfaces between adjoining layers. Annealing occurs at 220° C. to 400° C. A laminated layer with high PMA may also be included in one or more layers of a spin transfer oscillator.
Owner:TAIWAN SEMICON MFG CO LTD
Method of forming a fully wrapped-around shielded PMR writer pole
InactiveUS8533937B1Reduce and eliminate shadowing effectGood deposition coverageElectrical transducersManufacture head surfaceEngineeringNon magnetic
A method or forming a wrapped-around shielded perpendicular magnetic recording writer pole is disclosed. A structure comprising a leading shield layer and an intermediate layer disposed over the leading shield layer is provided, the intermediate layer comprising a pole material and a dielectric material. A trench is formed in the dielectric material. A non-magnetic layer in the trench is removed via an ion beam etching process. A seed layer is deposited in the trench and over the pole material. A magnetic material comprising a side shield layer is deposited on at least a portion of the seed layer.
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
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
Head for perpendicular recording with reduced erasure
ActiveUS20050128637A1Reduced erasure fieldReducing erasure fieldHeads using thin filmsRecord information storageEngineeringPerpendicular media
A perpendicular writer of the present invention comprises a main pole connected to two return poles and further includes one or more shorting shields thereby reducing erasure field on double layer perpendicular media. The perpendicular writer may include side shorting shields connecting the first and second return poles thereby modifying the crosstrack field gradient. Additionally, the perpendicular writer may include a top shorting shield modifying the downtrack gradient and may additionally include a bottom shorting shield for further reduction of erasure fields. The distance between the main pole and the shorting shields may be modified to customize the write field gradient.
Owner:SEAGATE TECH LLC
PMR head with an angled stitch layer
ActiveUS8537494B1Record information storageHeads for perpendicular magnetisationsMagnetic transducersAir bearing
A method and system for providing a magnetic transducer having an air-bearing surface (ABS) are described. The magnetic transducer includes a perpendicular magnetic recording (PMR) pole, an additional pole, a stitch, a shield, a write gap between the PMR pole and a portion of the shield, and at least one coil that energizes at least the additional pole. The PMR pole has a first front portion proximate to the ABS, while the additional pole is recessed from the ABS. The stitch resides between the PMR pole and the additional pole and has a stitch front portion between the front portion of the PMR pole and the additional pole. At least a portion of the write gap resides on the front portion of the PMR pole. At least a portion of the additional pole resides between the PMR pole and the shield.
Owner:WESTERN DIGITAL TECH INC
Method and system for coupling a laser with a slider in an energy assisted magnetic recording disk drive
A method and system for providing an energy assisted magnetic recording (EAMR) transducer coupled with a laser are described. The EAMR transducer has an air-bearing surface (ABS) configured to reside in proximity to a media during use. The method and system include providing at least one waveguide, at least one write pole, and at least one coil. The waveguide(s) are for directing the energy from the laser toward the ABS. The write pole(s) each include a write pole tip, a yoke, a back pedestal and a return pole. The write pole tip is coupled to the back pedestal through the yoke. The back pedestal has at least one aperture therein. The aperture(s) are configured to allow the energy from the laser to pass therethrough. The coil(s) are for energizing the at least one write pole.
Owner:WESTERN DIGITAL TECH INC
Resist pattern protection technique for double patterning application
InactiveUS8394280B1Decorative surface effectsSemiconductor/solid-state device manufacturingResistEngineering
Methods of patterning a material are disclosed. A first resist pattern is formed on a field. A protective layer is formed over the first resist pattern and at least a portion of the field. A second resist pattern is formed over a portion of the protective layer. A portion of a material to be patterned deposited adjacent to the first and second resist patterns is removed.
Owner:WESTERN DIGITAL TECH INC
Perpendicular magnetic recording head having a recessed magnetic base layer
ActiveUS8077434B1Record information storageHeads for perpendicular magnetisationsMagnetic transducersEngineering
A method and system for providing a magnetic transducer having an air-bearing surface (ABS) are described. The magnetic transducer includes a base layer, a perpendicular magnetic recording (PMR) pole on the base layer, an additional pole, a write shield, a write gap between the PMR pole and a portion of the write shield, and coil(s) that energize at least the additional pole. The base layer includes a first portion proximate to the ABS and a second portion recessed from the ABS. The first portion is nonmagnetic, while the second portion is magnetic. The PMR pole has a first front portion proximate to the ABS. The additional pole has a second front portion recessed from the ABS. At least a portion of the additional pole resides between the PMR pole and write shield. At least a portion of the write gap resides on the front portion of the PMR pole.
Owner:WESTERN DIGITAL TECH INC
Double patterning hard mask for damascene perpendicular magnetic recording (PMR) writer
Various embodiments of the subject disclosure provide a double patterning process that uses two patterning steps to produce a write structure having a nose shape with sharp corners. In one embodiment, a method for forming a write structure on a multi-layer structure comprising a substrate and an insulator layer on the substrate is provided. The method comprises forming a hard mask layer over the insulator layer, performing a first patterning process to form a pole and yoke opening in the hard mask layer, performing a second patterning process to remove rounded corners of the pole and yoke opening in the hard mask layer, removing a portion of the insulator layer corresponding to the pole and yoke opening in the hard mask layer to form a trench in the insulator layer, and filling the trench with a magnetic material.
Owner:WESTERN DIGITAL TECH INC
Methods of producing damascene main pole for perpendicular magnetic recording head
InactiveUS8262918B1Reduce defectsReduce complexityDecorative surface effectsRecord information storageMaterial removalEngineering
Methods of producing magnetic recording heads are disclosed. The methods can include providing a wafer comprising a substrate layer in which are disposed a plurality of damascene trenches. The method can further include depositing a pole material across the whole wafer, wherein the plurality of trenches are filled with the pole material. The methods can further include depositing a mask material over the pole material across the whole wafer. The methods can further include performing a first material removal process across the whole wafer to remove the mask material and a first portion of the pole material at a same material removal rate. The methods can further include performing a second material removal process to remove a second portion of the pole material above the substrate layer.
Owner:WESTERN DIGITAL TECH INC
Perpendicular magnetic recording head having a pole tip formed with a CMP uniformity structure
InactiveUS8149536B1Record information storageHeads for perpendicular magnetisationsChemical-mechanical planarizationElectrical and Electronics engineering
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
Method and system for providing a magnetic writer using a BARC
ActiveUS8072705B1Reduce reflectivityRecord information storageHeads for perpendicular magnetisationsReflectivityCoating
A method and system for providing a magnetic writer are described. The method and system include providing a bottom antireflective coating (BARC) on a portion of the magnetic writer. The BARC has a low reflectivity. The method and system also include providing a barrier layer on at least a portion of the BAR and providing a mask on at least a portion of the barrier layer. The barrier layer isolates the BARC from the mask.
Owner:WESTERN DIGITAL TECH INC
Method and system for providing a magnetic recording transducer having a hybrid moment pole
ActiveUS8228633B1Manufacture head surfaceRecord information storageMagnetic transducersMagnetic moment
A method and system provide a magnetic transducer that includes an air-bearing surface (ABS). The magnetic transducer includes an underlayer and a main pole residing on the underlayer. The main pole includes a front and a rear. The front resides at the ABS, while the rear is distal from the ABS. The main pole also includes a first portion having a first magnetic moment and a second portion having a second magnetic moment. The first portion has a front face at the ABS and terminates between the ABS and the rear of the main pole. A part of the second portion resides on the first portion, while another part of the second portion resides between the first portion of the main pole and the rear of the main pole. The first magnetic moment is less than the second magnetic moment.
Owner:WESTERN DIGITAL TECH INC
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