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公开(公告)号：US12087339B2
公开(公告)日：2024-09-10
申请号：US18226026
申请日：2023-07-25
CPC分类号： G11B5/7375 , G11B5/7369 , G11B2005/0021
摘要： Various apparatuses, systems, methods, and media are disclosed for heat-assisted magnetic recording (HAMR) that, in some examples, provide a HAMR medium with two soft underlayers (SULs) on opposing sides of a single heatsink layer. For example, a magnetic recording medium is provided that includes a lower SUL on a substrate. The lower SUL is configured and positioned within the medium to provide a first return path for magnetic flux from a magnetic recording head during a write operation. The medium also includes a heatsink layer on the lower SUL and an upper SUL on the heatsink layer. The upper SUL is configured and positioned within the medium to provide a second return path for magnetic flux from the magnetic recording head. A magnetic recording layer is provided on the upper SUL to store information during the write operation. Additional layers or films may be provided as well.
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公开(公告)号：US12057147B2
公开(公告)日：2024-08-06
申请号：US17511741
申请日：2021-10-27
发明人： Tong Zhao , Li Wan , Michael Christopher Kautzky
IPC分类号： G11B5/31 , B81C1/00 , B82B1/00 , H01F10/30 , H01L21/3065 , H01L21/67 , B82Y10/00 , G11B5/00 , G11B11/24 , H01L21/3213
CPC分类号： G11B5/3163 , B81C1/00111 , B82B1/003 , G11B5/3133 , H01F10/30 , H01L21/3065 , H01L21/30655 , H01L21/67069 , B81C2201/0132 , B81C2201/0143 , B82Y10/00 , G11B2005/0021 , G11B11/24 , H01L21/32136
摘要： A method of forming a thin film structure involves performing one or more repetitions to form a template on a wafer. The repetitions include: depositing a layer of a template material to a first thickness T1; and ion beam milling the layer of the template material to remove thickness T2, where T2
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公开(公告)号：US20240257831A1
公开(公告)日：2024-08-01
申请号：US18415795
申请日：2024-01-18
申请人： MINEBEA MITSUMI Inc.
发明人： Akihiko SUZUKI , Makoto CHONAN
CPC分类号： G11B5/3106 , C09D5/443 , G11B5/3163 , G11B2005/0021
摘要： Provided are a base member for a heat-assisted magnetic recording disk drive apparatus, the base member including: a coating film coating at least a part of the base member, in which the coating film is an overbaked epoxy resin-containing electrodeposition coating film, a spindle motor including the base member, and a method for manufacturing the base member.
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公开(公告)号：US12040001B1
公开(公告)日：2024-07-16
申请号：US18230018
申请日：2023-08-03
发明人： Barry C. Stipe
CPC分类号： G11B5/4866 , G11B13/08 , G11B2005/0021 , G11B2209/02
摘要： The present disclosure relates to pretreating a magnetic recording head assembly for magnetic media drive. The magnetic recording head assembly comprises a slider having a media facing surface (MFS), a top surface disposed opposite the MFS, a trailing edge surface disposed adjacent to the top surface, and an optical grating disposed on the trailing edge surface. A vertical cavity surface emitting laser (VCSEL) device is mounted to the trailing edge surface of the slider. The VCSEL device is aligned with the optical grating. A magnetic recording head comprising a waveguide and a near field transducer (NFT) coupled to the waveguide is disposed on the trailing edge surface of the slider. The VCSEL device is capable of emitting a plurality of lasers that are phase coherent on to the optical grating. The optical grating is capable of directing the emitted lasers about 90 degrees to the waveguide.
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5.发明授权公开(公告)号：US12027190B1
公开(公告)日：2024-07-02
申请号：US17512964
申请日：2021-10-28
发明人： Xiaoyue Huang
CPC分类号： G11B5/7375 , C23C14/021 , G11B5/255 , G11B5/3133 , G11B5/314 , G11B5/40 , H01L21/0206 , H01L21/02065 , H01L21/0228 , H01L21/28562 , G11B2005/0021 , G11B2209/02 , G11B2220/2516 , Y10T428/1164 , Y10T428/1193
摘要： A first layer that includes a metal seed layer, a refractive seed or a refractive dopant is formed on a dielectric substrate. A peg of a near-field transducer is formed on the first layer such that a first surface of the peg is formed on and is in contact with the metal seed. An adhesive layer is formed over the peg using atomic layer deposition. The adhesive layer includes alumina and is 4 nm or less in thickness. A silicon dioxide overcoat is deposited over the adhesive layer. The alumina bonds the silicon dioxide to the peg.
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公开(公告)号：US12027189B2
公开(公告)日：2024-07-02
申请号：US18119636
申请日：2023-03-09
发明人： Takao Furuhashi
IPC分类号： G11B5/00 , G11B5/54 , G11B5/60 , G11B11/105 , G11B33/12
CPC分类号： G11B5/607 , G11B5/54 , G11B33/121 , G11B2220/2516
摘要： According to one embodiment, a magnetic disk device includes a magnetic disk, a magnetic head including a write head which writes data to the magnetic disk, a read head which reads data from the magnetic disk, a first heater which adjusts a flying height of the write head, a second heater which adjusts a flying height of the read head and a controller which controls powers supplied to the first heater and the second heat, and controls a power value of the power supplied to the first heater according to a ratio between an electric resistance value of the first heater and an electric resistance value of the second heater.
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公开(公告)号：US12027186B2
公开(公告)日：2024-07-02
申请号：US18173783
申请日：2023-02-24
申请人： FUJIFILM CORPORATION
发明人： Eiichiro Kataoka
CPC分类号： G11B5/00813 , G11B15/67
摘要： A noncontact communication device includes a processor, and a transmission and reception device that applies a magnetic field to a noncontact storage medium mounted in a magnetic tape cartridge to induce power in the noncontact storage medium and is coupled to the noncontact storage medium by electromagnetic induction to perform transmission and reception of information with the noncontact storage medium. The noncontact storage medium has a measurement circuit that measures the power, and transmits power information regarding the power measured by the measurement circuit to the noncontact communication device. The transmission and reception device receives the power information, and the processor is configured to execute support processing of supporting the transmission and reception based on the power information received by the transmission and reception device.
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公开(公告)号：US11978489B1
公开(公告)日：2024-05-07
申请号：US18319984
申请日：2023-05-18
发明人： Jake Asmus , Larry LeeRoy Tretter
CPC分类号： G11B5/397 , G11B5/03 , G11B2005/0018
摘要： A computer program product, system, and method are provided for direct resistance measurement of a magnetoresistive (MR) head of a storage drive in a storage system. In one embodiment, a voltage difference across the MR reader head is measured directly by applying an AC current to the MR head to generate an AC voltage across the MR head that can propagate through filter capacitors and be measured. In one embodiment, the voltage difference is amplified and the peak-to-peak voltage at the output of the amplifier is captured. Similarly, a reference voltage difference across a reference resistance is measured directly by applying a reference AC current to a reference resistance. The resistance of an MR reader head may be calculated directly as a function of the respective voltage differences without including the resistance of any bias resistors biasing the MR head.
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公开(公告)号：US11967341B1
公开(公告)日：2024-04-23
申请号：US18344472
申请日：2023-06-29
申请人： Marvell Asia Pte Ltd
发明人： Supaket Katchmart , Mats Oberg
CPC分类号： G11B20/10009 , G11B5/012
摘要： A method for cancelling, from servo signals read in a read channel while a write channel is active, interference caused by write signals in the write channel, includes generating a predicted channel response signal from the write signals in a data clock domain, resampling the generated predicted channel response signal using a clock in the data clock domain having a rate corresponding to a servo clock from a servo clock domain, transferring the resampled predicted channel response signal from the data clock domain to the servo clock domain and aligning phase of the transferred resampled predicted channel response signal with phase of the servo clock, determining a domain-boundary-crossing delay incurred in the transferring, based on the domain-boundary-crossing delay, synchronizing the phase-aligned transferred resampled predicted channel response signal with the servo signals, and subtracting the synchronized phase-aligned transferred resampled predicted channel response signal from the servo signals.
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公开(公告)号：US11935568B2
公开(公告)日：2024-03-19
申请号：US18164120
申请日：2023-02-03
CPC分类号： G11B5/3146 , G11B5/314 , G11B2005/0024
摘要： According to one embodiment, a magnetic recording device includes a magnetic head and a controller. The magnetic head includes first and second magnetic poles, a magnetic element provided between the first magnetic pole and the second magnetic pole, first and second terminals electrically connected to one end and another end of the magnetic element, respectively, and a coil. The controller is electrically connected to the magnetic element and the coil, and performs a recording operation. In the recording operation, the controller supplies a recording current to the coil while applying an element voltage between the first and second terminals. When the applied voltage is changed while the recording current is supplied, a differential resistance of the magnetic element becomes a first differential resistance peak when the applied voltage is a first voltage, and becomes a second differential resistance peak when the applied voltage is a second voltage.
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