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1.发明授权公开(公告)号：US10083716B1
公开(公告)日：2018-09-25
申请号：US15678440
申请日：2017-08-16
IPC分类号： G11B11/00 , G11B7/1267 , G11B20/12 , G11B5/455 , G11B5/00 , G11B7/126 , G11B7/1263 , G11B5/60
CPC分类号： G11B7/1267 , G11B5/455 , G11B5/5534 , G11B5/6088 , G11B7/126 , G11B7/1263 , G11B20/10027 , G11B20/1217 , G11B2005/0021 , G11B2020/1232
摘要： A heat-assisted magnetic recording head is moved relative to a magnetic recording medium. The medium comprises a plurality of sectors. The sectors define a plurality of sector groups distributed around a circumference of the medium. The sectors of each sector group are written using different operational currents supplied to a laser diode of the head such that at least one sector from each sector group is written using one of the different operational currents. For each of the different operational currents, an average write performance metric is calculated for all sectors written at each of the different operational currents. A particular operational current of the different operational currents is determined that results in a best average write performance metric.
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公开(公告)号：US09990950B1
公开(公告)日：2018-06-05
申请号：US15651299
申请日：2017-07-17
IPC分类号： G11B11/00 , G11B5/60 , G11B20/10 , G11B5/00 , G11B7/126 , G11B7/1263 , G11B7/1267
CPC分类号： G11B5/6029 , G11B5/5534 , G11B5/607 , G11B5/6076 , G11B5/6088 , G11B7/126 , G11B7/1263 , G11B7/1267 , G11B20/10388 , G11B2005/0021
摘要： An apparatus comprises a slider configured for heat-assisted magnetic coupled to a controller. The slider comprises a writer, a heater, a near-field transducer, and an optical waveguide for communicating light from a laser diode to the near-field transducer. The controller is configured to set a target pre-write clearance of the slider prior to performing a write operation, set a target write clearance of the slider for performing the write operation, and determine a difference between the target pre-write and write clearances to define a target pre-write clearance offset. The controller is also configured to measure, for a plurality of different target pre-write clearance offsets, a writability metric for the slider while sweeping a laser diode current, and adjust the target pre-write clearance offset so that the writability metric reaches a predetermined threshold. The controller is further configured to perform subsequent write operations using the adjusted target pre-write clearance offset.
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公开(公告)号：US09595277B2
公开(公告)日：2017-03-14
申请号：US14797697
申请日：2015-07-13
发明人： Huazhou Lou , Jason W. Riddering
IPC分类号： G11B5/60
CPC分类号： G11B5/6029 , G11B5/5534 , G11B5/607 , G11B5/6076 , G11B2005/0021
摘要： Method and apparatus for controlling the fly height of a transducer. In some embodiments, a data pattern is written to a rotating data recording surface using a transducer having a write element, a read element and a thermal assist energy source. A first protrusion distance for the read element induced by operation of the energy source is determined responsive to first and second readback amplitudes obtained from the data pattern using different first and second power levels applied to the energy source. A second protrusion distance for the write element induced by the energy source is determined responsive to the first protrusion distance.
摘要翻译： 用于控制换能器的飞行高度的方法和装置。 在一些实施例中，使用具有写入元件，读取元件和热辅助能量源的换能器将数据模式写入旋转数据记录表面。 响应于使用施加到能量源的不同的第一和第二功率电平从数据模式获得的第一和第二回读幅度来确定由能量源的操作引起的读取元件的第一突出距离。 响应于第一突出距离确定由能量源引起的写入元件的第二突出距离。
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公开(公告)号：US20170018284A1
公开(公告)日：2017-01-19
申请号：US14797697
申请日：2015-07-13
发明人： Huazhou Lou , Jason W. Riddering
IPC分类号： G11B5/60
CPC分类号： G11B5/6029 , G11B5/5534 , G11B5/607 , G11B5/6076 , G11B2005/0021
摘要： Method and apparatus for controlling the fly height of a transducer. In some embodiments, a data pattern is written to a rotating data recording surface using a transducer having a write element, a read element and a thermal assist energy source. A first protrusion distance for the read element induced by operation of the energy source is determined responsive to first and second readback amplitudes obtained from the data pattern using different first and second power levels applied to the energy source. A second protrusion distance for the write element induced by the energy source is determined responsive to the first protrusion distance.
摘要翻译： 用于控制换能器的飞行高度的方法和装置。 在一些实施例中，使用具有写入元件，读取元件和热辅助能量源的换能器将数据模式写入旋转数据记录表面。 响应于使用施加到能量源的不同的第一和第二功率电平从数据模式获得的第一和第二回读幅度来确定由能量源的操作引起的读取元件的第一突出距离。 响应于第一突出距离确定由能量源引起的写入元件的第二突出距离。
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公开(公告)号：US10366719B1
公开(公告)日：2019-07-30
申请号：US15925927
申请日：2018-03-20
发明人： Jason W. Riddering , Dustin Mark Cvancara , Kenneth A. Haapala , Eric John McCalla , Wenzhong Zhu , Bin Huang
摘要： A clearance heater of a write head is engaged with a boosted current that exceeds a steady-state current. The steady-state current causes the write head to maintain a desired clearance over a disk during writing, the boosted current being applied before a start of the writing. The boosted current is monotonically decreased before the start of the writing and the steady-state current is applied to the heater after the start of the writing.
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公开(公告)号：US09875764B1
公开(公告)日：2018-01-23
申请号：US15432360
申请日：2017-02-14
发明人： Jason W. Riddering
CPC分类号： G11B5/6076 , G11B5/41 , G11B5/455 , G11B2005/0021
摘要： A slider is configured for heat-assisted magnetic recording to a magnetic recording medium. A low- or non-modulation interface is defined between the slider and the medium. A contaminant is present on the slider and between the slider and the medium. A controller is configured to control the slider to dislodge the contaminant from the slider by performing modulation-based contact detection at a location of the medium where modulation-based contact detection can accurately detect head-medium contact. The controller is also configured to perform friction-based contact detection using the slider devoid of the contaminant.
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公开(公告)号：US09824699B1
公开(公告)日：2017-11-21
申请号：US15420468
申请日：2017-01-31
CPC分类号： G11B5/09 , G11B5/58 , G11B5/6005 , G11B5/6088 , G11B7/126 , G11B11/10506 , G11B11/1051 , G11B2005/0021
摘要： A lumped-parameter function δ is determined that represents an average power dissipated by a write transducer when writing a signal to a magnetic recording medium. Temperatures of the write transducer are measured while varying the parameters to determine constants of the function δ. The function δ is used to adjust power applied to a clearance control heater when writing to the magnetic recording medium.
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公开(公告)号：US09236081B1
公开(公告)日：2016-01-12
申请号：US14674360
申请日：2015-03-31
发明人： Alfredo S. Chu , Jason W. Riddering , Drew M. Mader , Huazhou Lou , Pu-Ling Lu
IPC分类号： G11B11/00 , G11B7/1267 , G11B11/105 , G11B7/1263 , G11B7/12 , G11B5/48 , G11B5/60
CPC分类号： G11B7/1263 , G11B5/012 , G11B5/455 , G11B5/4866 , G11B5/6088 , G11B11/10595 , G11B2005/0021
摘要： A method includes setting a heat assisted magnetic recording (HAMR) device located in a data storage system having a laser to an operating temperature. A threshold laser current is determined. An optimal laser current is determined. The threshold laser current and the optimal laser current are stored in memory. The steps of determining a threshold laser current, determining an optimal laser current and storing the threshold laser current and the optimal laser current into the calibration table are repeated until acceptable device performance is achieved at more than one operating temperature.
摘要翻译： 一种方法包括将位于具有激光的数据存储系统中的热辅助磁记录（HAMR）装置设置到工作温度。 确定阈值激光电流。 确定最佳激光电流。 阈值激光电流和最佳激光电流存储在存储器中。 重复确定阈值激光电流，确定最佳激光电流并将阈值激光电流和最佳激光电流存储到校准表中的步骤，直到在多于一个工作温度下实现可接受的器件性能。
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