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1. 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。

2. 发明授权

US07522379B1 Write element with recessed pole and heat sink layer for ultra-high density writing 有权
标题翻译：写入元件具有凹陷极和散热层，用于超高密度写入
公开(公告)号：US07522379B1
公开(公告)日：2009-04-21
申请号：US10909226
申请日：2004-07-30
申请人： Mohamad T. Krounbi , Yining Hu , Ming Zhao , Kenneth Kung , Mark D. Thomas , Kroum S. Stoev , Francis H. Liu , Marcos M. Lederman
发明人： Mohamad T. Krounbi , Yining Hu , Ming Zhao , Kenneth Kung , Mark D. Thomas , Kroum S. Stoev , Francis H. Liu , Marcos M. Lederman
IPC分类号： G11B5/147
CPC分类号： G11B5/3133
摘要： A head including a write element for writing data to a magnetic media, and methods for its production are provided. A write element of the invention includes one or more of a recessed first pole, a heat sink layer, and a shortened yoke length. A method of the invention provides forming an anti-reflective layer before forming a mask layer. During photolithography the anti-reflective layer suppresses undesirable reflections off of features, such as vertical sidewalls, that otherwise limit how closely to such features portions of the mask layer can be formed.
摘要翻译：提供一种包括用于向磁性介质写入数据的写入元件的头，以及用于其生产的方法。本发明的写入元件包括凹入的第一极，散热层和缩短的磁轭长度中的一个或多个。本发明的方法提供了在形成掩模层之前形成抗反射层。在光刻期间，抗反射层抑制了诸如垂直侧壁的特征（例如垂直侧壁）的不期望的反射，否则可以限制与这些特征的接近程度，可以形成掩模层的部分。

3. 发明授权

US07337530B1 Method for manufacturing a shielded pole magnetic head for perpendicular recording 有权
标题翻译：用于制造用于垂直记录的屏蔽极磁头的方法
公开(公告)号：US07337530B1
公开(公告)日：2008-03-04
申请号：US11699777
申请日：2007-01-30
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： G11B5/147
CPC分类号： G11B5/313 , G11B5/1278 , G11B5/3116 , G11B2005/0029 , Y10T29/49032 , Y10T29/49041 , Y10T29/49046 , Y10T29/4905
摘要： A method of making a perpendicular magnetic recording head for use in a data storage device includes forming a first pole layer, a second pole layer, a third pole layer, and a shield layer of a write section. The first pole layer, second pole layer, third pole layer, and shield layer are formed without using a chemical mechanical polishing process. The method next includes concurrently trimming the shield layer and a write pole that is defined by the third pole layer to a predetermined track width. In the trimming step, the shield layer is used as a mask for the write pole.
摘要翻译：制造用于数据存储装置的垂直磁记录头的方法包括形成写入部分的第一极层，第二极层，第三极层和屏蔽层。在不使用化学机械抛光工艺的情况下形成第一极层，第二极层，第三极层和屏蔽层。该方法接下来包括同时修整屏蔽层和由第三极层限定到预定磁道宽度的写入极。在修整步骤中，屏蔽层用作写入极的掩模。

4. 发明授权

US07310204B1 Inductive writer design for using a soft magnetic pedestal having a high magnetic saturation layer 失效
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：US07310204B1
公开(公告)日：2007-12-18
申请号：US10741856
申请日：2003-12-19
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 has a pair of substantially flat soft magnetic pole layers separated by a pair of coil layers. A soft magnetic pedestal adjoins the leading pole layer adjacent to a medium-facing surface and is spaced from the second pole layer by a nanoscale nonferromagnetic gap, the pedestal having a layer of high magnetic saturation material that defines a throat height and extends beyond the throat height. A second high magnetic saturation material adjoins the trailing pole layer and either terminates at the throat height to form a second pedestal or extends to reach a magnetic backgap structure that magnetically couples the pole layers. The MR sensor can be located closer than the write transducer to the trailing end of the head to reduce separation between the read transducer and the write transducer.
摘要翻译：用于在相对移动的介质上写入信息的磁头具有由一对线圈层隔开的一对基本平坦的软磁极层。软磁性基座毗邻与中间面向表面相邻的引导极层，并且与第二极层间隔一纳米尺度的非铁磁隙，该基座具有一层高磁饱和度材料，其限定了喉部高度并延伸到喉部高度。第二高磁饱和材料邻接后极层并且终止于喉部高度以形成第二基座或延伸以到达磁耦合极层的磁性后隙结构。 MR传感器可以位于比写入传感器更靠近头部尾端的位置，以减少读取传感器与写入传感器之间的分离。

5. 发明授权

US07193815B1 Shielded pole magnetic head for perpendicular recording 有权
标题翻译：屏蔽极磁头用于垂直记录
公开(公告)号：US07193815B1
公开(公告)日：2007-03-20
申请号：US10819533
申请日：2004-04-06
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： G11B5/147
CPC分类号： G11B5/313 , G11B5/1278 , G11B5/3116 , G11B2005/0029 , Y10T29/49032 , Y10T29/49041 , Y10T29/49046 , Y10T29/4905
摘要： A read/write head for use in a perpendicular magnetic recording head in a data storage system. The read/write head includes a write section that is comprised of a first pole layer, a second pole layer, a third pole layer, and a shield layer. The third pole layer defines a write pole tip, and the third pole layer and the shield layer are separated from each other to define a write gap therebetween. At least part of the shield layer has a generally uniform width, and wherein the write pole tip defines a track width that is substantially equal to the uniform width of the shield layer. According to one embodiment the entire shield layer has a generally uniform width that is substantially equal to the track width. According to another embodiment, the shield layer includes a lower section and an upper section, wherein the lower section has a generally uniform width along its entire length, and wherein the upper section is wider than the lower section.
摘要翻译：用于数据存储系统中的垂直磁记录头的读/写头。读/写头包括由第一极层，第二极层，第三极层和屏蔽层组成的写入部分。第三极层限定写极尖，并且第三极层和屏蔽层彼此分离以在它们之间限定写入间隙。屏蔽层的至少一部分具有大致均匀的宽度，并且其中写极端部限定基本上等于屏蔽层的均匀宽度的轨道宽度。根据一个实施例，整个屏蔽层具有基本上等于轨道宽度的大致均匀的宽度。根据另一实施例，屏蔽层包括下部和上部，其中下部沿其整个长度具有大致均匀的宽度，并且其中上部比下部宽。

6. 发明授权

US6073338A Thin film read head with coplanar pole tips 失效
标题翻译：薄膜读头与共面极尖
公开(公告)号：US6073338A
公开(公告)日：2000-06-13
申请号：US912836
申请日：1997-08-19
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： G11B5/31 , G11B5/39 , G11B5/127 , G11B5/23
CPC分类号： B82Y25/00 , B82Y10/00 , G11B5/3116 , G11B5/3967 , G11B2005/3996 , G11B5/313 , Y10T29/49039 , Y10T29/49043 , Y10T29/49044
摘要： A method of manufacturing a thin film magnetic head which 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：一种制造薄膜磁头的方法，其采用在写入间隙中的平面内共面的极尖部件，以产生其宽度由极尖部件的厚度确定的写入轨迹。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两者的窄轨道宽度薄膜磁头。

7. 发明授权

US08139301B1 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：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。

8. 发明授权

US07688546B1 Perpendicular magnetic recording head having nonmagnetic insertion layers 有权
标题翻译：具有非磁性插入层的垂直磁记录头
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。

9. 发明授权

US06459552B1 Thin film read head with coplanar pole tips 失效
标题翻译：薄膜读头与共面极尖
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。

10. 发明授权

US5859754A Magnetoresistive transducer having a common magnetic bias using assertive and complementary signals 失效
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.

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