公开(公告)号：US08456980B1

公开(公告)日：2013-06-04

申请号：US13418904

申请日：2012-03-13

Applicant: Pradeep K. Thayamballi

Inventor： Pradeep K. Thayamballi

IPC: G11B7/00 ,  G11B11/00

CPC classification number: G11B5/607 ,  G11B5/012 ,  G11B2005/0021

Abstract: A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of data tracks defined by servo sectors. The head comprises a laser operable to heat the disk while writing data to the disk and a fly height actuator operable to adjust a fly height of the head over the disk. When the head approaches a target data sector of a write command, the fly height of the actuator adjusts the fly height of the head to a target pre-heat fly height during a pre-heat interval. After the pre-heat interval and during a pre-laser interval, the fly height actuator increases the fly height of the head. After the pre-laser interval, a power applied to the laser is increased to heat the disk, wherein the pre-laser interval compensates for a protrusion transient of the head toward the disk due to increasing the power applied to the laser.

Abstract translation: 公开了一种磁盘驱动器，包括在包括由伺服扇区定义的多个数据磁道的磁盘上启动的磁头。 头部包括可操作以在将数据写入盘的同时加热盘的激光器和可操作以调节头部在盘上的飞行高度的飞行高度致动器。 当头部接近写入命令的目标数据扇区时，执行器的飞行高度在预热间隔期间将头部的飞行高度调节到目标预热飞行高度。 在预热间隔之后和预激光间隔期间，飞行高度致动器增加了头部的飞行高度。 在预激光间隔之前，增加施加到激光器的功率以加热盘，其中预激光器间隔由于增加施加到激光器的功率而补偿头朝向盘的突起瞬变。

公开(公告)号：US06704167B1

公开(公告)日：2004-03-09

申请号：US09945406

申请日：2001-08-31

Applicant: John E. Scura ,  Pradeep K. Thayamballi ,  Haldun Arin

Inventor： John E. Scura ,  Pradeep K. Thayamballi ,  Haldun Arin

IPC: G11B554

CPC classification number: G11B5/54

Abstract: A disk drive includes a disk drive base and a latch attached to the disk drive base. The latch includes a latch impact surface having a latch impact surface perimeter. The latch impact surface perimeter defines a latch impact surface area. The disk drive includes a head stack assembly coupled to the disk drive base. The head stack assembly includes a tang. The head stack assembly is sized and configured to rotate to a parked position with the tang in mechanical communication with the latch. The tang has a tang impact surface. The disk drive includes a damping member disposed upon and disposed between the latch and the tang for damping impact between the tang and the latch and mitigating contact between the tang impact surface and the latch impact surface. The damping member has a damping member surface area less than the latch impact surface area.

Abstract translation: 磁盘驱动器包括磁盘驱动器基座和连接到磁盘驱动器基座的闩锁。 闩锁包括具有闩锁冲击表面周界的闩锁冲击表面。 闩锁冲击表面周界限定了闩锁冲击表面积。 磁盘驱动器包括耦合到磁盘驱动器基座的磁头堆叠组件。 头部堆叠组件包括一个柄脚。 头部堆叠组件的尺寸和构造被设计成旋转到停放位置，其中柄脚与闩锁机械连通。 脚有一个脚冲击表面。 磁盘驱动器包括一个阻尼构件，该阻尼构件设置在闩锁和脚之间，并且设置在闩锁和脚之间，用于阻止柄脚和闩锁之间的冲击并减轻脚部冲击表面和闩锁碰撞表面之间的接触。 阻尼构件具有小于闩锁冲击表面积的阻尼构件表面积。

公开(公告)号：US5726841A

公开(公告)日：1998-03-10

申请号：US661749

申请日：1996-06-11

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

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

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

CPC classification number: G11B5/3967 ,  G11B5/3116 ,  G11B5/3163

Abstract: 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.

Abstract translation: 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：US6103073A

公开(公告)日：2000-08-15

申请号：US680495

申请日：1996-07-15

Applicant: Pradeep K. Thayamballi

Inventor： Pradeep K. Thayamballi

IPC: B05D5/12 ,  C23C14/34

CPC classification number: G11B5/3163 ,  G11B5/3116

Abstract: A thin film magnetic head has a sharply defined zero throat location in the pole tip members utilizing a superior magnetic pole tip material having high resistivity and high magnetic induction. The zero throat location is defined by first depositing a first pole tip member on a first magnetic pole member which may be formed by plating and need not be composed of the same superior magnetic material as the first pole tip member. By etching the zero throat edge of the first pole tip member, a clearly defined edge location is produced. The second pole tip member of superior magnetic material is then deposited on an insulating gap layer which is formed on the lower pole tip member.

Abstract translation: 利用具有高电阻率和高磁感应的优良磁极尖端材料，薄磁头磁头在极尖部件中具有清晰的零喉部位置。 通过首先将第一极端部构件沉积在第一磁极构件上来限定零喉部位置，第一磁极构件可以通过电镀形成，并且不需要由与第一极端构件相同的优良磁性材料构成。 通过蚀刻第一极端部构件的零喉缘，产生明确限定的边缘位置。 然后将上磁性材料的第二极端部件沉积在形成在下极端部件上的绝缘间隙层上。

公开(公告)号：US5818685A

公开(公告)日：1998-10-06

申请号：US851265

申请日：1997-05-05

Applicant: Pradeep K. Thayamballi ,  Samuel W. Yuan

Inventor： Pradeep K. Thayamballi ,  Samuel W. Yuan

IPC: G01R33/09 ,  G11B5/39

CPC classification number: G11B5/3932

Abstract: A magnetic thin film head employing giant magnetoresistance (GMR) includes alternating layers of ferromagnetic material and nonmagnetic material coupled by magnetostatic and exchange interactions to produce an antiparallel orientation between the magnetic layers in the absence of an external field. Magnetic biasing is applied by a permanent magnet to the alternating layers to obtain a scissor-like configuration of the adjacent magnetic layers. The magnet is placed in contiguous junction with the multilayered GMR structure edge which is away from the air bearing surface, and is separated from the sensor by a nonmagnetic, nonconductive spacer.

Abstract translation: 使用巨磁电阻（GMR）的磁性薄膜头包括铁磁材料和非磁性材料的交替层，通过静磁和交换相互作用耦合，以在没有外部场的情况下在磁性层之间产生反平行取向。 通过永磁体将磁偏置施加到交替层，以获得相邻磁性层的剪刀状构造。 磁体与离开空气轴承表面的多层GMR结构边缘放置在连续的连接处，并且通过非磁性非导电间隔物与传感器分离。

公开(公告)号：US08441909B1

公开(公告)日：2013-05-14

申请号：US13418843

申请日：2012-03-13

Applicant: Pradeep K. Thayamballi ,  Wentao Yan ,  Matthew R. Gibbons ,  Dennis W. Hogg

Inventor： Pradeep K. Thayamballi ,  Wentao Yan ,  Matthew R. Gibbons ,  Dennis W. Hogg

IPC: G11B7/00 ,  G11B11/00

CPC classification number: G11B5/40 ,  G11B5/607 ,  G11B2005/0021

Abstract: A disk drive is disclosed comprising a disk comprising a plurality of data tracks, wherein each data track comprises a plurality of data sectors. A head is actuated over the disk, wherein the head comprises a laser operable to heat the disk while writing data to the disk. When a write command is received to write data to a target data sector of a target data track, the head is positioned over the target data track. When the head reaches the target data sector, a power applied to the laser is increased to above a steady state value to compensate for a high fly height of the head. The power applied to the laser is decreased toward the steady state value while writing at least part of the data to the target data sector.

Abstract translation: 公开了一种磁盘驱动器，其包括包括多个数据磁道的磁盘，其中每个数据磁道包括多个数据扇区。 头部被驱动在盘上，其中头部包括可操作的加热盘的激光器，同时将数据写入到盘中。 当接收到写入命令以将数据写入目标数据轨道的目标数据扇区时，头部位于目标数据轨道上方。 当头到达目标数据扇区时，施加到激光器的功率增加到高于稳态值，以补偿头的高飞高。 施加到激光器的功率朝向稳态值减小，同时将至少部分数据写入目标数据扇区。

公开(公告)号：US08004782B1

公开(公告)日：2011-08-23

申请号：US12407619

申请日：2009-03-19

Applicant: Michael Nojaba ,  Pradeep K. Thayamballi ,  James Tze-Hwa Tung ,  Julius A. Turangan

Inventor： Michael Nojaba ,  Pradeep K. Thayamballi ,  James Tze-Hwa Tung ,  Julius A. Turangan

IPC: G11B27/36 ,  G11B33/14 ,  G11B5/33 ,  G01R33/00

CPC classification number: G11B33/1493 ,  G11B5/455 ,  G11B5/4555

Abstract: A tester system includes a tester and a radioactive isotope source. The tester includes a spindle assembly, a disk mounted to the spindle assembly, and a head actuatable over the disk. The radioactive isotope source is positioned in an ionizing location proximate the tester, such that a minimum distance between the radioactive isotope source and an axis of rotation of the disk is less than a radius of the disk.

Abstract translation: 测试仪系统包括测试仪和放射性同位素源。 测试仪包括一个主轴组件，一个安装在主轴组件上的磁盘，以及一个可在磁盘上驱动的磁头。 放射性同位素源位于靠近测试器的电离位置，使得放射性同位素源和盘的旋转轴之间的最小距离小于盘的半径。

公开(公告)号：US5385637A

公开(公告)日：1995-01-31

申请号：US986252

申请日：1992-12-07

Applicant: Pradeep K. Thayamballi

Inventor： Pradeep K. Thayamballi

IPC: G11B5/31 ,  G11B5/00

CPC classification number: G11B5/3163 ,  G11B5/3113 ,  Y10T29/49034

Abstract: A method and means for reducing readback non-repeatability in thin film heads due to non-repeatablele domain structure, comprising the steps of depositing a layer of antiferromagnetic material, such as MnFe, to create larger uniaxial anisotropy, and localizing such a layer in the upper magnetic pole to improve head performance without sacrificing efficiency. In a particular implementation, alternating layers of NiFe/MnFe/NiFe, each 500 Angstroms thick, are deposited, followed by a sputtered seed layer for subsequent plating. After lapping to correct throat height, the head is then heated above the Neel temperature of MnFe and cooled in the presence of an applied magnetic field.

Abstract translation: 一种用于减少由于不可重复域结构导致的薄膜磁头中的回读不可重复性的方法和装置，其特征在于包括沉积诸如MnFe的反铁磁性材料层以产生更大的单轴各向异性的步骤，以及将这种层定位在 上磁极提高头部性能而不牺牲效率。 在一个具体实施方案中，沉积每500埃厚的NiFe / MnFe / NiFe交替层，随后是溅射种子层用于随后的镀覆。 研磨后，将头部加热到高于NeFe的MnFe温度，并在施加的磁场存在下冷却。