公开(公告)号：US07126788B1

公开(公告)日：2006-10-24

申请号：US10724385

申请日：2003-11-26

申请人： Francis H. Liu ,  Kroum S. Stoev ,  Yugang Wang

发明人： Francis H. Liu ,  Kroum S. Stoev ,  Yugang Wang

IPC分类号： G11B5/17 ,  G11B5/147

CPC分类号： G11B5/3116 ,  G11B5/1278 ,  G11B5/17 ,  G11B2005/0002

摘要： A magnetic head for writing information on perpendicular media has a write pole tip, a return pole tip and a deflection pole tip is disclosed. The return pole tip has a media-facing area at least two orders of magnitude greater than that of the write pole tip, and the deflection pole tip is spaced from a trailing corner of the write pole tip by a submicron nonferromagnetic gap. Magnetic flux emanating from the write pole tip is strongest adjacent the trailing corner and directed at an angle that is not perpendicular to the write pole tip. The angled flux provides increased torque to rotate magnetic dipoles in the adjacent media layer that are oriented substantially perpendicular to the disk surface. The media may have a soft magnetic underlayer that is spaced from the write pole tip by a distance similar to the gap spacing.

摘要翻译： 用于在垂直介质上写入信息的磁头具有写极端，回极极端和偏转极尖。 返回极端部具有比写入磁极尖端大至少两个数量级的面向介质的区域，并且偏转极尖端与写入磁极尖端的后角部分间隔有亚微米非铁磁隙。 从写入极尖发出的磁通量最靠近后角并以不垂直于写入极尖的角度指向。 角度通量提供增加的扭矩以旋转基本上垂直于盘表面定向的相邻介质层中的偶极子。 介质可以具有与写磁极尖端间隔一段类似于间隙间隔的软磁性底层。

公开(公告)号：US07092195B1

公开(公告)日：2006-08-15

申请号：US10856403

申请日：2004-05-28

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： G11B21/02

CPC分类号： G11B5/60 ,  G11B5/6064

摘要： A method adjusts a flying-height distance between a magnetic write head and a magnetic medium. The method includes positioning the write head in a location spaced from the magnetic medium by the flying-height distance. The write head includes a magnetic yoke and a proximal region in proximity to the magnetic medium. The write head further includes a resistive heater and at least a portion of the resistive heater is within the magnetic yoke and is in proximity to the proximal region. The resistive heater is configured to heat the proximal region. The proximal region has a coefficient of thermal expansion. The proximal region is configured to expand and to contract in response to a temperature of the proximal region. The method further includes flowing an electric current through the resistive heater. The method further includes controlling the electric current to adjust the temperature of the proximal region to selectively expand and contract the proximal region and thereby control the flying-height distance. Controlling the electric current includes pulsing the electrical current and adjusting a time interval between pulses.

摘要翻译： 一种方法调节磁写头和磁介质之间的飞行高度距离。 该方法包括将写入头定位在与磁介质隔开飞行高度距离的位置。 写磁头包括磁轭和靠近磁介质的近侧区域。 写头还包括电阻加热器，并且电阻加热器的至少一部分在磁轭内并且靠近近端区域。 电阻加热器被配置为加热近端区域。 近端区域具有热膨胀系数。 近端区域被配置为响应于近端区域的温度膨胀和收缩。 该方法还包括使电流流过电阻加热器。 该方法还包括控制电流以调节近端区域的温度以选择性地扩展和收缩近端区域，从而控制飞行高度距离。 控制电流包括脉冲电流和调节脉冲之间的时间间隔。

公开(公告)号：US06791793B1

公开(公告)日：2004-09-14

申请号：US09952989

申请日：2001-09-14

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： G11B5147

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 adjunct pole is substantially recessed from the air bearing surface. 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。 附加杆基本上从空气轴承表面凹入。 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。

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。

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。

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。

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。

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。

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。

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。