公开(公告)号：US20120087042A1

公开(公告)日：2012-04-12

申请号：US13199188

申请日：2011-08-22

申请人： Yuchen Zhou ,  Kenichi Takano ,  Kowang Liu ,  Kunliang Zhang ,  Liejie Guan ,  Moris Dovek ,  Joe Smyth

发明人： Yuchen Zhou ,  Kenichi Takano ,  Kowang Liu ,  Kunliang Zhang ,  Liejie Guan ,  Moris Dovek ,  Joe Smyth

IPC分类号： G11B5/147 ,  G11B5/60

CPC分类号： G11B5/3113 ,  G11B5/1278 ,  G11B5/147 ,  G11B5/3146 ,  Y10T29/49032 ,  Y10T29/49034 ,  Y10T29/49043 ,  Y10T29/49044

摘要： A PMR writer is disclosed that minimizes pole erasure during non-writing and maximize write field during writing through an AFM-FM phase change material that is in an antiferromagnetic (AFM) state during non-writing and switches to a ferromagnetic (FM) state by heating during writing. The main pole layer including the write pole may be comprised of a laminated structure having a plurality of “n” ferromagnetic layers and “n−1” AFM-FM phase change material layers arranged in an alternating manner. The AFM-FM phase change material is preferably a FeRh, FeRhPt, FeRhPd, or FeRhIr and may also be used as a flux gate to prevent yoke flux from leaking into the write pole tip. Heating for the AFM to FM transition is provided by write coils and/or a coil located near the AFM-FM phase change material to enable faster transition times.

摘要翻译： 公开了一种PMR写入器，其在非写入期间最小化磁极擦除，并且在写入期间通过在非写入期间处于反铁磁（AFM）状态的AFM-FM相变材料中写入期间最大化写入场并且通过以下方式切换到铁磁（FM）状态： 书写过程中加热。 包括写极的主极层可以由具有多个“n”个铁磁层和“n-1”个AFM-FM相变材料层的交替排列的层压结构构成。 AFM-FM相变材料优选为FeRh，FeRhPt，FeRhPd或FeRhIr，并且还可以用作磁通门以防止磁轭焊剂泄漏到写极尖端。 AFM到FM转换的加热由位于AFM-FM相变材料附近的写入线圈和/或线圈提供，以实现更快的转换时间。

公开(公告)号：US08085498B2

公开(公告)日：2011-12-27

申请号：US12586249

申请日：2009-09-17

申请人： Zhigang Bai ,  Yue Liu ,  Kowang Liu ,  Yan Wu ,  Moris Dovek

发明人： Zhigang Bai ,  Yue Liu ,  Kowang Liu ,  Yan Wu ,  Moris Dovek

IPC分类号： G11B5/127

CPC分类号： G11B5/3116 ,  G11B5/1278 ,  G11B5/3163

摘要： A PMR writer having a trailing shield structure is disclosed in which a flux choking layer (FCL) formed adjacent to the ABS provides a means to limit the amount of flux flowing from the trailing shield to a first write shield (WS1) near the write pole tip thereby significantly reducing adjacent track erasure. The FCL has a substantially smaller thickness than a top section of the trailing shield to which it is attached along a side opposite the ABS. As a result, pole tip protrusion is reduced compared to prior art PMR writers. The FCL contacts a trailing side of WS1 at the ABS and one or both of the trailing sides of the WS1 and FCL may be tapered or perpendicular with respect to the ABS. The top trailing shield section, FCL, and WS1 may be comprised of NiFe, CoFe, CoFeNi, or alloys thereof.

公开(公告)号：US07748439B2

公开(公告)日：2010-07-06

申请号：US10823098

申请日：2004-04-13

申请人： Kowang Liu ,  Daniel G. Abels

发明人： Kowang Liu ,  Daniel G. Abels

IPC分类号： F28F7/00

CPC分类号： G11B5/3106 ,  G11B5/3133 ,  Y10T29/49032 ,  Y10T29/49043

摘要： A heat extractor to transfer heat generated by the coil of a magnetic read head to a substrate, when there is at least one thermally insulating layer between the coil and the substrate, is disclosed, together with a method for its manufacture.

摘要翻译： 公开了一种在线圈和衬底之间存在至少一个绝热层时将由磁读头的线圈产生的热量传递到衬底的散热器及其制造方法。

公开(公告)号：US20090323227A1

公开(公告)日：2009-12-31

申请号：US12215825

申请日：2008-06-30

申请人： Min Zheng ,  Min Li ,  Chen-Jung Chien ,  Kowang Liu ,  Sung Chung

发明人： Min Zheng ,  Min Li ,  Chen-Jung Chien ,  Kowang Liu ,  Sung Chung

IPC分类号： G11B5/33

CPC分类号： G11B5/314 ,  G11B5/6064

摘要： A dynamic fly heater (DFH) for improved lifetime and better film uniformity is disclosed for a magnetic head. The heater has a lower amorphous Ta layer and an upper W layer to promote small grain size and reduced electro-migration. The composite film is especially advantageous for heaters greater than 1000 Angstroms thick where dR/R is difficult to control in the prior art. The DFH may be a (Ta/W)n laminate in which the Ta layers are about 30 Angstroms thick and the combined thickness of the W layers is from 400 to 1200 Angstroms. A Ta film is preferably sputter deposited with an Ar pressure of 3 to 5 mTorr and the W film is sputter deposited in the same chamber with a 3 to 20 mTorr Ar pressure. In one embodiment, a merged read/write head has one DFH in the read head and a second DFH in the write head.

摘要翻译： 公开了一种用于改善寿命和更好的膜均匀性的动态飞行加热器（DFH）。 加热器具有较低的非晶Ta层和上W层，以促进小晶粒尺寸和减少的电迁移。 复合膜对于现有技术中dR / R难以控制的大于1000埃的加热器是特别有利的。 DFH可以是（Ta / W）n层叠体，其中Ta层的厚度约为30埃，W层的组合厚度为400至1200埃。 优选以3至5mTorr的Ar压力溅射沉积Ta膜，并将W膜以3至20mTorr Ar压力溅射沉积在相同的室中。 在一个实施例中，合并的读/写头在读头中具有一个DFH，在写头中具有第二DFH。

公开(公告)号：US20090141406A1

公开(公告)日：2009-06-04

申请号：US11987786

申请日：2007-12-04

申请人： Yoshitaka Sasaki ,  Hiroyuki Itoh ,  Hironori Araki ,  Takehiro Horinaka ,  Kowang Liu ,  Erhard Schreck

发明人： Yoshitaka Sasaki ,  Hiroyuki Itoh ,  Hironori Araki ,  Takehiro Horinaka ,  Kowang Liu ,  Erhard Schreck

IPC分类号： G11B5/33

CPC分类号： G11B5/1278 ,  G11B5/112 ,  G11B5/3116 ,  G11B5/3136 ,  G11B5/3146 ,  G11B5/315 ,  G11B5/3163

摘要： A magnetic head includes a pole layer and a shield. The shield includes a shield layer having a front end face located in the medium facing surface at a position forward of an end face of the pole layer along a direction of travel of the recording medium. The magnetic head further includes a stopper layer for suppressing protrusion of the front end face of the shield layer, the stopper layer being disposed adjacent to the shield layer and made of a nonmagnetic material having a linear thermal expansion coefficient of 5×10−6/° C. or smaller at a temperature of 25° C. to 100° C.

摘要翻译： 磁头包括极层和屏蔽。 屏蔽层包括屏蔽层，该屏蔽层具有前端面，该前端面沿着记录介质的行进方向位于磁极层的端面的前方的位置处于介质相对表面。 磁头还包括用于抑制屏蔽层前端面的突起的阻挡层，该阻挡层邻近屏蔽层设置并由线性热膨胀系数为5×10 -6 /℃的非磁性材料制成 在25℃至100℃的温度下

公开(公告)号：US08593915B2

公开(公告)日：2013-11-26

申请号：US13136462

申请日：2011-08-01

申请人： Erhard Schreck ,  Kowang Liu ,  Kouji Shimazawa ,  Po-Kang Wang

发明人： Erhard Schreck ,  Kowang Liu ,  Kouji Shimazawa ,  Po-Kang Wang

IPC分类号： G11B11/00

CPC分类号： G11B5/314 ,  G11B5/6088 ,  G11B2005/001 ,  G11B2005/0021

摘要： A slider mounted TAMR (Thermal Assisted Magnetic Recording), DFH (Dynamic Flying Height) type read/write head using optical-laser generated surface plasmons in a small antenna to locally heat a magnetic medium, uses the same optical laser at low power to pre-heat the antenna. Maintaining the antenna at this pre-heated temperature, approximately 50% of its highest temperature during write operations, allows the DFH mechanism sufficient time to compensate for the thermal protrusion of the antenna at that lower temperature, so that thermal protrusion transients are significantly reduced when a writing operation occurs and full laser power is applied. The time constant for antenna protrusion is less than the time constant for DFH fly height compensation, so, without pre-heating, the thermal protrusion of the antenna due to absorption of optical radiation cannot be compensated by the DFH effect.

摘要翻译： 使用在小天线中使用光学激光产生的表面等离子体激光器来局部加热磁介质的TAMR（热辅助磁记录），DFH（动态飞行高度）型读/写头的滑块，以低功率使用相同的光学激光器 - 加热天线。 将天线维持在该预热温度下，在写入操作期间其最高温度的约50％允许DFH机构有足够的时间来补偿在该较低温度下的天线的热突起，使得热突起瞬变显着降低 发生写入操作并施加全激光功率。 天线突起的时间常数小于DFH飞行高度补偿的时间常数，因此，在没有预热的情况下，由于吸收光辐射而导致的天线热突起不能被DFH效应补偿。

公开(公告)号：US08274758B2

公开(公告)日：2012-09-25

申请号：US12157683

申请日：2008-06-12

申请人： Yan Wu ,  Kowang Liu

发明人： Yan Wu ,  Kowang Liu

IPC分类号： G11B5/147

CPC分类号： G11B5/3146 ,  G11B5/11 ,  G11B5/1278 ,  G11B5/3136

摘要： A PMR writer in a read/write head is disclosed wherein an upper shield covering the coil layer is comprised of a magnetic layer optimized for magnetic performance and a second layer used for tuning mechanical protrusion. The composite layer simultaneously provides high saturation magnetization and high permeability from the magnetic layer and low CTE from the second layer which tunes the relative spacing between the writer, reader, and the rest of the slider. In one embodiment, first and second write shields are formed on a write gap layer and have front portions at the ABS and back portions in a back gap region. The upper write shield connects on one side with the second write shield at the ABS and on a second side with the back gap region. This design can yield better reader and writer spacing for the same physical clearance which enables products with higher recording density.

摘要翻译： 公开了一种读/写头中的PMR写入器，其中覆盖线圈层的上屏蔽包括针对磁性能优化的磁性层和用于调谐机械突起的第二层。 复合层同时提供来自磁性层的高饱和磁化强度和高磁导率和来自第二层的低CTE，其调节写入器，读取器和滑块的其余部分之间的相对间隔。 在一个实施例中，第一和第二写屏蔽形成在写间隙层上并且在ABS的前部和后间隙区中的后部形成。 上写入屏蔽在一侧与ABS的第二写屏蔽连接，并且在第二侧与后间隙区域相连。 该设计可以为相同的物理间隙产生更好的读取器和写入器间距，从而使具有更高记录密度的产品。

公开(公告)号：US20110292773A1

公开(公告)日：2011-12-01

申请号：US13136462

申请日：2011-08-01

申请人： Erhard Schreck ,  Kowang Liu ,  Kouji Shimazawa ,  Po-Kang Wang

发明人： Erhard Schreck ,  Kowang Liu ,  Kouji Shimazawa ,  Po-Kang Wang

IPC分类号： G11B11/00

CPC分类号： G11B5/314 ,  G11B5/6088 ,  G11B2005/001 ,  G11B2005/0021

摘要： A slider mounted TAMR (Thermal Assisted Magnetic Recording), DFH (Dynamic Flying Height) type read/write head using optical-laser generated surface plasmons in a small antenna to locally heat a magnetic medium, uses the same optical laser at low power to pre-heat the antenna. Maintaining the antenna at this pre-heated temperature, approximately 50% of its highest temperature during write operations, allows the DFH mechanism sufficient time to compensate for the thermal protrusion of the antenna at that lower temperature, so that thermal protrusion transients are significantly reduced when a writing operation occurs and full laser power is applied. The time constant for antenna protrusion is less than the time constant for DFH fly height compensation, so, without pre-heating, the thermal protrusion of the antenna due to absorption of optical radiation cannot be compensated by the DFH effect.

公开(公告)号：US07995425B2

公开(公告)日：2011-08-09

申请号：US12381327

申请日：2009-03-11

申请人： Erhard Schreck ,  Kowang Liu ,  Kouji Shimazawa ,  Po-Kang Wang

发明人： Erhard Schreck ,  Kowang Liu ,  Kouji Shimazawa ,  Po-Kang Wang

IPC分类号： G11B11/00

CPC分类号： G11B5/314 ,  G11B5/6088 ,  G11B2005/001 ,  G11B2005/0021

摘要： A slider mounted TAMR (Thermal Assisted Magnetic Recording), DFH (Dynamic Flying Height) type read/write head using optical-laser generated surface plasmons in a small antenna to locally heat a magnetic medium, uses the same optical laser at low power to pre-heat the antenna. Maintaining the antenna at this pre-heated temperature, approximately 50% of its highest temperature during write operations, allows the DFH mechanism sufficient time to compensate for the thermal protrusion of the antenna at that lower temperature, so that thermal protrusion transients are significantly reduced when a writing operation occurs and full laser power is applied. The time constant for antenna protrusion is less than the time constant for DFH fly height compensation, so, without pre-heating, the thermal protrusion of the antenna due to absorption of optical radiation cannot be compensated by the DFH effect.

摘要翻译： 使用在小天线中使用光学激光产生的表面等离子体激光器来局部加热磁介质的TAMR（热辅助磁记录），DFH（动态飞行高度）型读/写头的滑块，以低功率使用相同的光学激光器 - 加热天线。 将天线维持在该预热温度下，在写入操作期间其最高温度的约50％允许DFH机构有足够的时间来补偿在该较低温度下的天线的热突起，使得热突起瞬变显着降低 发生写入操作并施加全激光功率。 天线突起的时间常数小于DFH飞行高度补偿的时间常数，因此，在没有预热的情况下，由于吸收光辐射而导致的天线热突起不能被DFH效应补偿。

公开(公告)号：US20110063755A1

公开(公告)日：2011-03-17

申请号：US12586249

申请日：2009-09-17

申请人： Zhigang Bai ,  Yue Liu ,  Kowang Liu ,  Yan Wu ,  Moris Dovek

发明人： Zhigang Bai ,  Yue Liu ,  Kowang Liu ,  Yan Wu ,  Moris Dovek

IPC分类号： G11B5/10 ,  G11B5/127

CPC分类号： G11B5/3116 ,  G11B5/1278 ,  G11B5/3163

摘要： A PMR writer having a trailing shield structure is disclosed in which a flux choking layer (FCL) formed adjacent to the ABS provides a means to limit the amount of flux flowing from the trailing shield to a first write shield (WS1) near the write pole tip thereby significantly reducing adjacent track erasure. The FCL has a substantially smaller thickness than a top section of the trailing shield to which it is attached along a side opposite the ABS. As a result, pole tip protrusion is reduced compared to prior art PMR writers. The FCL contacts a trailing side of WS1 at the ABS and one or both of the trailing sides of the WS1 and FCL may be tapered or perpendicular with respect to the ABS. The top trailing shield section, FCL, and WS1 may be comprised of NiFe, CoFe, CoFeNi, or alloys thereof.

摘要翻译： 公开了具有拖尾屏蔽结构的PMR写入器，其中与ABS相邻形成的通量阻塞层（FCL）提供了一种将从后屏蔽流过的磁通量限制在写极附近的第一写屏蔽（WS1）的装置 从而显着地减少相邻轨道擦除。 FCL具有比尾部护罩的顶部部分基本上小的厚度，其沿着与ABS相对的一侧被附接到该顶部部分。 结果，与现有技术的PMR写入器相比，极尖突起减小。 FCL在ABS处接触WS1的后侧，并且WS1和FCL的一个或两个后侧可以相对于ABS呈锥形或垂直。 顶部后屏蔽部分FCL和WS1可以由NiFe，CoFe，CoFeNi或其合金组成。