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1. 发明授权

US08514506B1 Disk drive comprising a dual read element and delay circuitry to improve read signal 有权
标题翻译：磁盘驱动器包括双重读取元件和延迟电路，以改善读取信号
公开(公告)号：US08514506B1
公开(公告)日：2013-08-20
申请号：US13371252
申请日：2012-02-10
申请人： Shaoping Li , Yimin Guo , Francis H. Liu , Sining Mao
发明人： Shaoping Li , Yimin Guo , Francis H. Liu , Sining Mao
IPC分类号： G11B5/09 , G11B20/10
CPC分类号： G11B5/3954 , G11B5/012 , G11B20/10009 , G11B20/10037 , G11B20/10046 , G11B20/10074 , G11B20/10175 , G11B20/10222 , G11B20/10231 , G11B20/10277 , G11B20/10305 , G11B20/10314 , G11B20/10379 , G11B20/1258 , G11B2220/2516
摘要： A disk drive is disclosed comprising a disk having a plurality of data tracks, and a head actuated over the disk, the head comprising a first read element and a second read element. A data track is read to generate a first read signal emanating from the first read element and a second read signal emanating from the second read element. The first read signal is delayed in continuous time relative to the second read signal to generate a delayed read signal, and the second read signal is combined with the delayed read signal to generate a combined read signal. An estimated data sequence is detected from the combined read signal.
摘要翻译：公开了一种磁盘驱动器，其包括具有多个数据磁道的磁盘，以及在盘上驱动的磁头，磁头包括第一读取元件和第二读取元件。读取数据磁道以产生从第一读取元件发出的第一读取信号和从第二读取元件发出的第二读取信号。第一读取信号相对于第二读取信号以连续时间延迟，以产生延迟的读取信号，并且将第二读取信号与延迟的读取信号组合以产生组合的读取信号。从组合的读取信号中检测估计的数据序列。

2. 发明授权

US08385157B1 Method and system for performing EAMR recording at high density using a large thermal spot size 有权
标题翻译：使用大的热点尺寸以高密度进行EAMR记录的方法和系统
公开(公告)号：US08385157B1
公开(公告)日：2013-02-26
申请号：US12570975
申请日：2009-09-30
申请人： Eric J. Champion , Francis H. Liu , Adam F. Torabi
发明人： Eric J. Champion , Francis H. Liu , Adam F. Torabi
IPC分类号： G11B11/00
CPC分类号： G11B5/012 , G11B2005/0021
摘要： A method and system for writing data to a media utilizing an energy assisted magnetic recording (EAMR) head are described. The EAMR head includes at least one laser and at least one EAMR transducer. The laser(s) provide energy. The EAMR transducer(s) are coupled with the laser. The EAMR transducer(s) are configured to direct the energy to spot(s) on the media and to write a plurality of tracks of data in a block. The method and system include writing a track of the plurality of tracks on the media within the spot(s) using the EAMR transducer and stepping a track pitch along a particular radial direction on the media. The method and system also include repeating the writing and stepping steps until the plurality of tracks for the block is written.
摘要翻译：描述了使用能量辅助磁记录（EAMR）头将数据写入介质的方法和系统。 EAMR头包括至少一个激光器和至少一个EAMR传感器。激光器提供能量。 EAMR传感器与激光器耦合。 EAMR传感器被配置为将能量引导到介质上的点，并将多个数据轨迹写入块中。该方法和系统包括使用EAMR传感器在所述位置内的介质上写入多个轨道的轨道，并且沿着介质上的特定径向方向对轨道间距进行步进。方法和系统还包括重复写入和步进步骤，直到写入块的多个轨道为止。

3. 发明授权

US07443632B1 Magnetic head with stitched top pole layer and single layer coil or solenoidal coil 有权
标题翻译：磁头采用缝合顶极层和单层线圈或螺线管线圈
公开(公告)号：US07443632B1
公开(公告)日：2008-10-28
申请号：US11780110
申请日：2007-07-19
申请人： Kroum S. Stoev , Francis H. Liu , Yugang Wang
发明人： Kroum S. Stoev , Francis H. Liu , Yugang Wang
IPC分类号： G11B5/127 , G11B5/147
CPC分类号： G11B5/3116 , G11B5/17 , G11B5/3146
摘要： A magnetic head is disclosed that has first and second substantially flat soft magnetic pole layers that are magnetically coupled together in a backgap region that is removed from the medium-facing surface; a soft magnetic pedestal having a leading edge and a trailing edge, the trailing edge adjoining the second pole layer adjacent to the medium-facing surface, the leading edge defining a throat area that is spaced from the first pole layer by a submicron nonferromagnetic gap and defining an apex area that is spaced from the first pole layer by a greater separation than the gap, the throat area meeting the apex area at a throat height; and a plurality of substantially parallel, electrically conductive sections disposed between the first and second pole layers, the conductive sections disposed in a single layer that is aligned along a plane that intersects the pedestal and the backgap region.
摘要翻译：公开了一种磁头，其具有第一和第二基本上平坦的软磁极层，其在从介质面向表面移除的后隙区域中磁耦合在一起; 具有前缘和后缘的软磁性基座，所述后缘邻近所述第二极层与所述介质相对表面相邻，所述前缘限定与所述第一极层间隔开亚微米非铁磁间隙的喉部区域，以及限定与所述第一极层间隔开比所述间隙更大的间隔的顶点区域，所述喉部区域在喉部高度处满足所述顶点区域; 以及设置在所述第一和第二极层之间的多个基本上平行的导电部分，所述导电部分设置在沿着与所述基座和所述后隙区域相交的平面对齐的单个层中。

4. 发明授权

US07375926B1 Inductive writer design using a soft magnetic pedestal having a high magnetic saturation layer 有权
标题翻译：使用具有高磁饱和层的软磁基座的感应写入器设计
公开(公告)号：US07375926B1
公开(公告)日：2008-05-20
申请号：US11779785
申请日：2007-07-18
申请人： Kroum S. Stoev , Francis H. Liu , Yugang Wang , Yingjian Chen
发明人： Kroum S. Stoev , Francis H. Liu , Yugang Wang , Yingjian Chen
IPC分类号： G11B5/187
CPC分类号： G11B5/1871 , G11B5/3116 , G11B5/3146 , G11B5/3967
摘要： A magnetic head for writing information on a relatively-moving medium includes a first substantially flat soft magnetic pole layer and a second substantially flat pole layer with at least one coil layer between them. The pole layers are magnetically coupled in a core region and spaced by more than one micron from one other. A soft magnetic pedestal adjoins the first pole layer adjacent to a medium-facing surface of the head, and a first high magnetic saturation layer adjoins the pedestal. A second high magnetic saturation layer adjoins the second pole layer. The first high magnetic saturation layer has a first throat height and the second high magnetic saturation layer extends from the medium-facing surface only to a second throat height. The first and second throat heights are within about one and one-half microns from the medium-facing surface and are essentially equal.
摘要翻译：用于在相对移动的介质上写入信息的磁头包括第一基本平坦的软磁极层和在它们之间具有至少一个线圈层的第二基本平坦的极性层。磁极层磁芯耦合在磁芯区域并彼此间隔超过一微米。软磁座与第一磁极层相邻，与磁头的介质表面相邻，第一高磁饱和层邻接基座。第二高磁饱和层邻接第二极层。第一高磁饱和层具有第一喉部高度，而第二高磁饱和层从介质中的表面延伸到第二喉部高度。第一和第二喉部高度距离面向介质的表面大约一个半微米，并且基本相等。

5. 发明授权

US07283327B1 Magnetic write head having resistive heater coil 失效
标题翻译：具有电阻加热线圈的磁写头
公开(公告)号：US07283327B1
公开(公告)日：2007-10-16
申请号：US11451770
申请日：2006-06-13
申请人： Francis H. Liu , Kroum S. Stoev , Mohamad T. Krounbi
发明人： Francis H. Liu , Kroum S. Stoev , Mohamad T. Krounbi
IPC分类号： G11B5/17 , G11B5/56 , G11B21/02
CPC分类号： G11B5/60 , G11B5/6064
摘要： A magnetic write head includes a magnetic yoke having a first pole and a second pole. The first pole and the second pole each terminate at an air bearing surface. The first pole is magnetically coupled to the second pole in a backgap region. The magnetic write head further includes a electrically conductive write coil magnetically coupled to the magnetic yoke. The magnetic write head further includes a resistive heater coil having a first coil turn and a second coil turn. The heater coil is electrically isolated from the write coil. At least a portion of the first coil turn is between the first pole and the second pole and between the air bearing surface and the backgap region. At least a portion of the second coil turn is between the first pole and the second pole and between the air bearing surface and the backgap region. The portion of the first coil turn overlaps the portion of the second coil turn.
摘要翻译：磁写头包括具有第一极和第二极的磁轭。第一极和第二极各自终止于空气轴承表面。第一极在后隙区域磁耦合到第二极。磁写头还包括磁耦合到磁轭的导电写入线圈。磁写头还包括具有第一线圈匝和第二线圈匝的电阻加热器线圈。加热器线圈与写入线圈电隔离。第一线圈匝的至少一部分在第一极和第二极之间以及空气支承表面和后隙区之间。第二线圈匝的至少一部分在第一极和第二极之间以及空气支承表面和后隙区之间。第一线圈圈的部分与第二线圈匝的部分重叠。

6. 发明授权

US07239478B1 Write element for perpendicular recording in a data storage system 有权
标题翻译：在数据存储系统中用于垂直记录的写入元素
公开(公告)号：US07239478B1
公开(公告)日：2007-07-03
申请号：US10769409
申请日：2004-01-31
申请人： Kyusik Sin , Yinshi Liu , Benjamin Chen , Francis H. Liu
发明人： Kyusik Sin , Yinshi Liu , Benjamin Chen , Francis H. Liu
IPC分类号： G11B5/127
CPC分类号： G11B5/112 , G11B5/1278 , G11B5/3116 , G11B5/315 , G11B5/3163
摘要： A write element for perpendicular recording in a data storage system is fabricated to maintain the thickness of a side shield at both edges of a pole P3, and to form the pole P3 in a trapezoidal shape. Forming a side shield around the pole P3 removes stray fields, creating a quiet, noise-free write element and preventing side erasure. The fabrication method utilizes a magnetic buffer layer to protect a shield gap during trim of the pole P3, and thus to provide the shield gap with a uniform thickness. The magnetic buffer layer also protects the shield gap and pole P3 when the top hard mask is removed. Consequently, the write field is made uniform across the track width. The fabrication method uses a metal in the shield gap to improve the pole geometry after pole trim and to provide a uniform edge to the pole P3.
摘要翻译：制造用于在数据存储系统中进行垂直记录的写入元件，以将侧屏蔽件的厚度保持在极点P 3的两个边缘处，并且形成梯形形状的极点3。在P 3周围形成一个侧面屏蔽可去除杂散场，创建一个安静，无噪音的写入元件，并防止侧面擦除。该制造方法利用磁性缓冲层来保护极P 3的修整期间的屏蔽间隙，从而提供具有均匀厚度的屏蔽间隙。当去除顶部硬掩模时，磁缓冲层还保护屏蔽间隙和极点P 3。因此，写入磁道在磁道宽度上是均匀的。制造方法使用屏蔽间隙中的金属来改善极修整之后的极几何形状，并且向极P 3提供均匀的边缘。

7. 发明授权

US07212384B1 Magnetic read head with recessed hard bias and current leads 有权
标题翻译：具有凹陷硬偏置和电流引线的磁读头
公开(公告)号：US07212384B1
公开(公告)日：2007-05-01
申请号：US10788653
申请日：2004-02-27
申请人： Kroum S. Stoev , Amritpal S. Rana , Francis H. Liu
发明人： Kroum S. Stoev , Amritpal S. Rana , Francis H. Liu
IPC分类号： G11B5/39
CPC分类号： G11B5/3932
摘要： A read element includes a magnetoresistive sensor having a side and an upper surface that defines an edge. An underlayer overlies the side of the magnetoresistive sensor, and a hard bias layer overlies at least part of the underlayer and defines a hard bias junction with the underlayer. A lead is formed atop the hard bias layer. The hard bias junction is recessed from the edge of the magnetoresistive sensor by a predetermined recess distance, to provide stability and sensitivity to the read element.
摘要翻译：读取元件包括具有限定边缘的侧面和上表面的磁阻传感器。底层覆盖在磁阻传感器的侧面，并且硬偏压层覆盖在底层的至少一部分上并且限定与底层的硬偏压连接。在硬偏压层顶部形成引线。硬偏压接合部从磁阻传感器的边缘凹入预定的凹陷距离，以向读取元件提供稳定性和灵敏度。

8. 发明授权

US06906894B2 Write head having a recessed, magnetic adjunct pole formed atop a main pole, and method of making the same 有权
标题翻译：具有形成在主极上方的凹入的磁性辅助极的写头及其制造方法
公开(公告)号：US06906894B2
公开(公告)日：2005-06-14
申请号：US10903977
申请日：2004-07-29
申请人： Yingjian Chen , Xiaozhong Dang , Francis H. Liu , Kroum Stoev , Hai Jiang , Yugang Wang , Xizeng Shi
发明人： Yingjian Chen , Xiaozhong Dang , Francis H. Liu , Kroum Stoev , Hai Jiang , Yugang Wang , Xizeng Shi
IPC分类号： G11B5/127 , G11B5/31 , G11B5/147
CPC分类号： G11B5/1278 , G11B5/3109 , Y10T29/49034 , Y10T29/49044
摘要： 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.
摘要翻译：读/写头及其制造方法用于数据存储系统，例如磁盘驱动器，用于数据的垂直磁记录。头部采用双层极设计，其主极由溅射高磁矩材料制成，电极由电镀软磁膜制成。主极用于将数据写入介质，并形成在写入线圈上。辅助杆从空气轴承表面基本上凹入并且形成在主极上。本头设计显着增强了磁写入场，并且基本上减少了导致磁记录介质上的相邻轨道中的数据的意外擦除的侧写。

9. 发明授权

US06392850B1 Magnetoresistive transducer having a common magnetic bias using assertive and complementary signals 失效
标题翻译：具有使用断言和互补信号的公共磁偏置的磁阻换能器
公开(公告)号：US06392850B1
公开(公告)日：2002-05-21
申请号：US09651053
申请日：1998-10-19
申请人： Hua-Ching Tong , Francis H. Liu , Minshen Tan , Robert Earl Rottmayer , Jian-Gang Zhu , Samuel W. Yuan
发明人： Hua-Ching Tong , Francis H. Liu , Minshen Tan , Robert Earl Rottmayer , Jian-Gang Zhu , Samuel W. Yuan
IPC分类号： G11B539
CPC分类号： B82Y25/00 , B82Y10/00 , G01R33/093 , G01R33/096 , G11B5/3954 , G11B2005/3996
摘要： Magnetic transducers are formed with common magnetic exchange layers capable of providing assertive and complementary signals. The transducers include an assertive transducer portion and a complementary transducer portion. Between the two transducer portions is a common bias portion which comprises an antiferromagnetic layer providing bias fields in different directions to the respective transducer portions. During normal operations, a current is directed into each of the transducer portions. The assertive transducer portion, being magnetically biased in one direction, generates a varying voltage as an assertive version of the electrical signal. The complementary transducer, being magnetically biased in another direction, generates another varying voltage as a complementary version of the electrical signal. In one embodiment, the transducer portions are implemented to operate as an anisotropic MR(AMR) sensor. In a second embodiment, the transducer portions operate as a giant MR(GMR) or spin valve sensor.
摘要翻译：磁传感器形成有能够提供断言和互补信号的公共磁交换层。换能器包括断言换能器部分和互补换能器部分。在两个换能器部分之间是公共偏置部分，其包括反铁磁层，其向相应的换能器部分提供不同方向的偏置场。在正常操作期间，电流被引导到每个换能器部分中。在一个方向上被磁偏置的断言换能器部分产生变化的电压作为电信号的断言版本。互补传感器在另一个方向上被磁偏置，产生另一个变化的电压作为电信号的互补版本。在一个实施例中，传感器部分被实现为用作各向异性MR（AMR）传感器。在第二实施例中，换能器部分作为巨型MR（GMR）或自旋阀传感器工作。

10. 发明授权

US5876848A Thin film magnetic structure having ferromagnetic and antiferromagnetic layers 失效
标题翻译：具有铁磁性和反铁磁性层的薄膜磁性结构
公开(公告)号：US5876848A
公开(公告)日：1999-03-02
申请号：US794765
申请日：1997-02-03
申请人： Minshen Tan , Hua-Ching Tong , Francis H. Liu , Swie-In Tan
发明人： Minshen Tan , Hua-Ching Tong , Francis H. Liu , Swie-In Tan
IPC分类号： C23C14/35 , G01R33/09 , G11B5/31 , G11B5/39 , H01F10/32 , H01F41/30 , B05D5/12
CPC分类号： B82Y25/00 , B82Y40/00 , C23C14/351 , G01R33/093 , G11B5/3109 , G11B5/3113 , G11B5/3903 , G11B5/3948 , H01F10/3218 , H01F10/3254 , H01F41/302 , Y10T428/265
摘要： A method of forming a magnetic structure having layers with different magnetization orientations provided by a common magnetic bias layer includes the steps of depositing an antiferromagnetic layer between first and second ferromagnetic layers. During the deposition of the first and second ferromagnetic layers, magnetization fields of different orientations are employed separately to induce different directions of magnetization in the first and second layers. The different directions of magnetization in the first and second layers are sustained, through the process of exchange coupling, by the interposed antiferromagnetic layer which serves as the bias layer. A magnetic structure thus fabricated, can be used as a read transducer capable of generating differential signals with common mode noise rejection, and can be used as a magnetic pole for a magnetic head with reduced Barkhausen noise.
摘要翻译：形成具有由公共偏磁层提供的具有不同磁化取向的层的磁性结构的方法包括以下步骤：在第一和第二铁磁层之间沉积反铁磁性层。在沉积第一和第二铁磁层期间，分别采用不同取向的磁化场以在第一和第二层中引起不同的磁化方向。通过交换耦合的过程，通过用作偏置层的插入的反铁磁层来维持第一和第二层中不同的磁化方向。如此制造的磁结构可以用作能够产生具有共模噪声抑制的差分信号的读取传感器，并且可以用作具有降低的巴克豪森噪声的磁头的磁极。

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