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：US5726841A

公开(公告)日：1998-03-10

申请号：US661749

申请日：1996-06-11

申请人： Hua-Ching Tong ,  Francis H. Liu ,  Samuel W. Yuan ,  Vernon M. Riedlin, Jr. ,  Pradeep K. Thayamballi

发明人： Hua-Ching Tong ,  Francis H. Liu ,  Samuel W. Yuan ,  Vernon M. Riedlin, Jr. ,  Pradeep K. Thayamballi

IPC分类号： G11B5/31 ,  G11B5/39 ,  G11B5/187

CPC分类号： G11B5/3967 ,  G11B5/3116 ,  G11B5/3163

摘要： An air bearing magnetic head is formed with a trimmed head pole tip that includes first and second poles having first and second surfaces respectively, which are coplanar with the air bearing surface of the magnetic head. A pair of leading and trailing bevel surfaces are angularly formed with respect to the first and second surfaces respectively. The bevel surfaces retract portions of the head pole tip away from the surface of a storage medium, and render the head pole tip less sensitive to stray flux, resulting in readback data signals being practically free of undesirable signal undershoots and overshoots. In addition, a minute amount of pole material of the first and second surfaces are trimmed away, thereby defining stepped areas with narrow widths in the first and second poles. The stepped areas enable the magnetic head to record data with narrow and well defined track widths.

摘要翻译： 一个空气轴承磁头形成有一个修剪的磁头极头，它包括分别具有与磁头的空气支承表面共面的第一和第二表面的第一和第二磁极。 一对前后斜面分别相对于第一表面和第二表面成角度地形成。 斜面使头磁极尖端的部分远离存储介质的表面，并使磁头极尖对杂散磁通较不敏感，导致回读数据信号实际上没有不期望的信号下冲和过冲。 此外，第一和第二表面的极材料的微小量被修剪掉，从而在第一和第二极中限定具有窄宽度的台阶区域。 台阶区域使得磁头能够以窄且良好的轨道宽度记录数据。

公开(公告)号：US08139301B1

公开(公告)日：2012-03-20

申请号：US12507294

申请日：2009-07-22

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 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被延迟以产生延迟的读取信号，并且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：US07688546B1

公开(公告)日：2010-03-30

申请号：US11643493

申请日：2006-12-21

申请人： Zhigang Bai ,  Peng Luo ,  Kroum S. Stoev ,  Francis H. Liu ,  Yugang Wang ,  Adam F. Torabi

发明人： Zhigang Bai ,  Peng Luo ,  Kroum S. Stoev ,  Francis H. Liu ,  Yugang Wang ,  Adam F. Torabi

IPC分类号： G11B5/17

CPC分类号： G11B5/3116 ,  G11B5/1278

摘要： The method and system provide a perpendicular magnetic recording (PMR) head having an air bearing surface (ABS). The PMR head includes first and second poles each having front and back gap regions, a first nonmagnetic insertion layer between the back gap regions, a magnetic pole layer with a front terminating at the ABS, a write gap, shield(s), a second nonmagnetic insertion layer between the second pole back gap region and the shield(s), and coil(s) between the shield(s) and the first pole. The magnetic pole layer terminates between the ABS and the second pole back gap region and has pole angle(s) of at least thirty and not more than fifty degrees. At least part of the magnetic pole layer resides on the second pole. Part of the shield(s) are adjacent to the write gap. Another part of the shield(s) is coupled with the second pole back gap region.

摘要翻译： 该方法和系统提供具有空气轴承表面（ABS）的垂直磁记录（PMR）头。 PMR头包括第一和第二极，每个具有前后间隙区域，在后间隙区域之间的第一非磁性插入层，在ABS处终止于前面的磁极层，写入间隙，屏蔽，第二极 第二极背间隙区域和屏蔽之间的非磁性插入层以及屏蔽和第一极之间的线圈。 磁极层终止在ABS和第二极背间隙区域之间，并且具有至少三十度且不超过五十度的极角。 磁极层的至少一部分位于第二极上。 屏蔽的一部分与写入间隙相邻。 屏蔽的另一部分与第二极背隙区域耦合。

公开(公告)号：US06459552B1

公开(公告)日：2002-10-01

申请号：US09528858

申请日：2000-03-20

申请人： Francis H. Liu ,  Hua-Ching Tong ,  Samuel W. Yuan

发明人： Francis H. Liu ,  Hua-Ching Tong ,  Samuel W. Yuan

IPC分类号： G11B539

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/3116 ,  G11B5/313 ,  G11B5/3163 ,  G11B5/3169 ,  G11B5/3967 ,  G11B2005/3996 ,  Y10T29/49039 ,  Y10T29/49043 ,  Y10T29/49044

摘要： A thin film magnetic head employs pole tips members which are coplanar in a plane across the write gap to produce a written track whose width is determined by the thickness of the pole tip members. The coplanar write structure may be combined with a multilayer read sensor disposed in the write gap to produce a narrow trackwidth thin film magnetic head having both write and read capabilities.

摘要翻译： 薄膜磁头使用在写入间隙中的平面中共面的极尖构件，以产生其宽度由极尖构件的厚度确定的写入轨道。 共面写入结构可以与设置在写入间隙中的多层读取传感器组合以产生具有写入和读取能力的窄轨道宽度薄膜磁头。

公开(公告)号：US5859754A

公开(公告)日：1999-01-12

申请号：US833058

申请日：1997-04-03

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： G01R33/09 ,  G11B5/39

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.

公开(公告)号：US5792547A

公开(公告)日：1998-08-11

申请号：US607130

申请日：1996-02-26

申请人： Francis H. Liu ,  Minshen Tan ,  Hua-Ching Tong

发明人： Francis H. Liu ,  Minshen Tan ,  Hua-Ching Tong

IPC分类号： G11B5/31 ,  G11B5/39 ,  H01F10/32 ,  G11B5/127

CPC分类号： B82Y25/00 ,  G11B5/3113 ,  G11B5/3903 ,  G11B5/3925 ,  H01F10/3218 ,  G11B5/3163 ,  Y10S428/90 ,  Y10T428/1186 ,  Y10T428/24942

摘要： A laminated pole structure for use in a low noise magnetic head suitable for high frequency signal operation is formed by interleaving a plurality of ferromagnetic layers and electrically insulating antiferromagnetic layers so as to form interface surfaces therebetween. External magnetic fields are applied as the interface surfaces are being formed for establishing exchange anisotropies with predetermined permanent exchange pinning directions in the ferromagnetic layers. The exchange anisotropies may be in the same or opposite directions, as defined by the external magnetic fields. In one embodiment, the pole structure has an open edge lamination, while in another embodiment the pole structure has a closed edge lamination. In still another embodiment, the antiferromagnetic layers include predetermined patterns of nonmagnetic material.

摘要翻译： 用于适用于高频信号操作的低噪声磁头中的层叠极结构是通过交错多个铁磁层和电绝缘反铁磁层形成的，以便在它们之间形成界面。 当形成界面表面以在铁磁层中建立具有预定永久交换钉扎方向的交换各向异性时，施加外部磁场。 交换各向异性可以是与外部磁场所定义的相同或相反的方向。 在一个实施例中，极结构具有开口边缘层叠，而在另一实施例中，极结构具有封闭边缘层叠。 在另一个实施例中，反铁磁层包括非磁性材料的预定图案。

公开(公告)号：US5612098A

公开(公告)日：1997-03-18

申请号：US696656

申请日：1996-08-14

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 ,  C23C14/08

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。