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1.发明授权公开(公告)号：US11244703B2
公开(公告)日：2022-02-08
申请号：US17172371
申请日：2021-02-10
发明人： Sukumar Rajauria , Yuichi Aoki , Yukio Kato , Kosuke Nagase , Kiyoshi Hashimoto , Qing Dai
摘要： The present disclosure relates to pretreating a magnetic recording head to increase the lifetime of the magnetic media drive. A transparent smear is purposefully formed on the magnetic recording head to ensure the magnetic recording head does not overheat and lead to a short drive lifetime. The transparent smear is formed from material found in the magnetic media. The transparent smear is formed by pretreating the magnetic recording head with the transparent material from the magnetic media. The pretreating occurs without writing any data to the magnetic media. Once the transparent smear is in place, writing may occur. The magnetic recording head can be retreated at a later time should the transparent smear degrade. Furthermore, if an optically absorbing smear develop, it can be removed and a new transparent smear may be formed.
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公开(公告)号：US10950267B1
公开(公告)日：2021-03-16
申请号：US16805403
申请日：2020-02-28
发明人： Yuichi Aoki , Yukio Kato , Kosuke Nagase , Kiyoshi Hashimoto , Huaming Xu , Qing Dai , Sukumar Rajauria
摘要： The present disclosure relates to a magnetic recording medium for a magnetic media drive. Absorbing smears can develop on magnetic recording heads during operation. The absorbing smears lead to shortened drive lifetime. Transparent smears, on the other hand, do not have as deleterious of an impact on drive lifetime as compared to absorbing smears. By doping the medium with a dopant that can lead to development of transparent smears, the formation of absorbing smears can be reduced or even eliminated, which leads to a longer drive lifetime. The dopant can be disposed in the capping layer of the medium or in the absorbing overcoat layer. The dopant will migrate through the medium to the top surface of the medium during operation. From the top surface of the medium, the dopant will deposit on the magnetic head and form a transparent smear.
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公开(公告)号：US10650850B1
公开(公告)日：2020-05-12
申请号：US16437270
申请日：2019-06-11
发明人： Sukumar Rajauria , Na Wang , Erhard Schreck , Qing Dai , John Thomas Contreras
摘要： A hard disk drive has a gas-bearing slider supporting a write head with an electrically conductive structure, like a spin-torque oscillator (STO), in the write gap, and dual independent interface voltage control (IVC) circuitry coupled to elements on the slider. A first IVC circuitry provides a bias voltage to the slider body to assure substantially zero electrical potential between the slider body and the disk to minimize slider-disk contact and lubrication pick-up. A second IVC circuitry operates independently of the first IVC circuitry and provides a bias voltage to the electrically conductive structure region to assure a negative potential of the electrically conductive structure region relative to the disk to minimize degradation of the slider overcoat and thus oxidation of the electrically conductive structure.
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公开(公告)号：US10468071B1
公开(公告)日：2019-11-05
申请号：US15996092
申请日：2018-06-01
发明人： Kenji Tasaka , Yuichiro Sano , Ehsan Rismaniyazdi , Barry Stipe , Nobuyuki Okunaga , Erhard Schreck , Oscar Ruiz , Qing Dai , Sripathi V. Canchi , Weidong Huang , Yong Hu , Kenji Kuroki
摘要： Disclosed herein is a magnetic storage device that comprises a housing defining an interior cavity. The magnetic storage device also comprises at least one magnetic disk in the interior cavity of the housing. The magnetic storage device further comprises at least one read-write head in the interior cavity and configured to read data from and write data to the magnetic disk. The read-write head comprises a heat-assisted magnetic storage (HAMR) head. The magnetic storage device additionally comprises a gas, comprising oxygen and helium, sealed in the interior cavity of the housing. A percent concentration of oxygen in the gas is greater than or equal to 3%. A pressure of the gas is between 10% and 70%, inclusive, of atmospheric pressure. A relative humidity within the interior cavity is less than 5%, inclusive. A percent concentration of helium in the gas is less than or equal to 90%.
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5.发明授权公开(公告)号：US10950266B1
公开(公告)日：2021-03-16
申请号：US16805414
申请日：2020-02-28
发明人： Sukumar Rajauria , Yuichi Aoki , Yukio Kato , Kosuke Nagase , Kiyoshi Hashimoto , Qing Dai
摘要： The present disclosure relates to pretreating a magnetic recording head to increase the lifetime of the magnetic media drive. A transparent smear is purposefully formed on the magnetic recording head to ensure the magnetic recording head does not overheat and lead to a short drive lifetime. The transparent smear is formed from material found in the magnetic media. The transparent smear is formed by pretreating the magnetic recording head with the transparent material from the magnetic media. The pretreating occurs without writing any data to the magnetic media. Once the transparent smear is in place, writing may occur. The magnetic recording head can be retreated at a later time should the transparent smear degrade. Furthermore, if an optically absorbing smear develop, it can be removed and a new transparent smear may be formed.
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6.发明授权公开(公告)号：US10910007B1
公开(公告)日：2021-02-02
申请号：US16791238
申请日：2020-02-14
发明人： Tan Trinh , Sukumar Rajauria , Yuichi Aoki , Kosuke Nagase , Erhard Schreck , Qing Dai
摘要： A heat-assisted magnetic recording (HAMR) hard disk drive has a gas-bearing slider supporting a near-field transducer (NFT) and a NFT temperature sensor (NTS). An optional first IVC circuitry may provide a bias voltage to the slider body to assure substantially zero electrical potential between the slider body and the disk to minimize slider-disk contact and lubrication pick-up. A second IVC circuitry operates independently of the first IVC circuitry and provides a negative bias voltage to the NTS (and the connected NFT) relative to the disk to minimize the adverse effects of excessive heating on the NFT.
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7.发明公开公开(公告)号：US20240331729A1
公开(公告)日：2024-10-03
申请号：US18231905
申请日：2023-08-09
发明人： Bernd Lamberts , William B. Boyle , David R. Hall , Erhard Schreck , Qing Dai , Phillip S. Haralson
IPC分类号： G11B7/0045 , G11B19/04
CPC分类号： G11B7/00458 , G11B19/044
摘要： Various illustrative aspects are directed to a data storage device, comprising one or more disks; an actuator system configured to position a selected head among one or more heads proximate to a corresponding disk surface among the one or more disks; and one or more processing devices. The selected head comprises a write element, an assistive energy emitter, an energizing interface coupled to the assistive energy emitter, and a detector. The assistive energy emitter is driven separately from driving of the write element. The one or more processing devices are configured to detect, via the detector, an energy anomaly at the energizing interface; detect, in response to detecting the energy anomaly, whether a previously written track yields an anomalous readback signal; and rewrite, in response to detecting that the previously written track yields an anomalous readback signal, data designated for the previously written track to the previously written track.
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8.发明公开公开(公告)号：US20240304214A1
公开(公告)日：2024-09-12
申请号：US18232003
申请日：2023-08-09
发明人： Bernd Lamberts , Bernhard E. Knigge , Erhard Schreck , Qing Dai
CPC分类号： G11B5/607 , G11B5/4866
摘要： Various illustrative aspects are directed to a data storage device, comprising one or more disks; an actuator mechanism configured to position one or more heads proximate to a corresponding disk surface of the one or more disks; and one or more processing devices. The one or more processing devices are configured to receive signals indicative of conditions of a write operation by the selected head. The one or more processing devices are further configured to determine, based on the signals, a verification status indicating whether the write operation was successful. The one or more processing devices are further configured to output the verification status within a selected time limit.
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公开(公告)号：US20230238023A1
公开(公告)日：2023-07-27
申请号：US18093596
申请日：2023-01-05
发明人： Tan Duy Trinh , Yixiang Zhang , Sukumar Rajauria , Erhard Schreck , Qing Dai , Paul Christopher Dorsey
CPC分类号： G11B5/314 , G11B5/3163 , G11B5/7266 , G11B2005/0021
摘要： Various apparatuses, systems, methods, and media are disclosed to provide a heat-assisted magnetic recording (HAMR) medium that has a media carbon dual-layer media carbon overcoat with both a carbon layer and a carbon-nitrogen (CN) layer. The carbon layer may be a plasma enhanced chemical vapor deposition (PECVD) carbon layer and the CN layer may be a sputtered CN layer. The dual-layer media carbon overcoat helps reduce a laser power requirement of an HAMR disk drive system and thus reduce the operating temperature of a near field transducer (NFT) of a HAMR disk drive. The dual-layer overcoat can also improve thermal and thermo-oxidative stability of the media and help retain a lubricant provided on the overcoat, therefore improving HAMR head-media interface reliability. The dual-layer media carbon overcoat can also reduce carbonaceous smear within a head-media gap.
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公开(公告)号：US09922676B1
公开(公告)日：2018-03-20
申请号：US15616569
申请日：2017-06-07
发明人： Erhard Schreck , Oscar J. Ruiz , Na Wang , Shaomin Xiong , Qing Dai
IPC分类号： G11B7/00 , G11B7/1263
CPC分类号： G11B7/1263
摘要： A data storage device is disclosed comprising a head actuated over a disk, wherein the head comprises a laser configured to heat the disk while writing data to the disk. A write power is applied to the laser in order to write data to the disk during a write operation. A determination is made as to whether the laser power should be in an off state after the write operation. After the write operation, the laser power is gradually decreased to the off state based on a first decrease function.
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