公开(公告)号：US07529065B2

公开(公告)日：2009-05-05

申请号：US11134746

申请日：2005-05-19

申请人： Eric Edward Fullerton ,  Olav Hellwig ,  Byron Hassberg Lengsfield, III ,  David T. Margulies

发明人： Eric Edward Fullerton ,  Olav Hellwig ,  Byron Hassberg Lengsfield, III ,  David T. Margulies

IPC分类号： G11B5/66

CPC分类号： G11B5/012 ,  G11B5/66 ,  G11B2005/0002

摘要： The invention uses an upper and lower magnetic layer of a laminated magnetic layer structure that includes an AF spacer layer that results in weak antiferromagnetic coupling of the magnetic layers that is insufficient to cause either of the layers to switch so that the magnetic orientations of the two ferromagnetic layers remain parallel. An advantage of the invention is that the AF-coupling tends to anti-correlate the noise in the two layers. The weak AF coupling according to the invention is believed to act at the transition boundaries in the media to cause some of the noise domains to be oriented antiparallel and the noise to be less correlated than would be the case without the AF coupling and thereby to achieve improved SNR.

摘要翻译： 本发明使用层叠磁性层结构的上下磁性层，其包括AF间隔层，其导致磁性层的弱反铁磁耦合，其不足以导致任一层切换，使得两者的磁取向 铁磁层保持平行。 本发明的一个优点是AF耦合倾向于使两层中的噪声相互关联。 认为根据本发明的弱AF耦合被认为在介质中的过渡边界处起作用以使得一些噪声区域被反平行取向，并且噪声与没有AF耦合的情况相比更不相关，从而实现 改善的SNR。

公开(公告)号：US07443630B2

公开(公告)日：2008-10-28

申请号：US11279072

申请日：2006-04-07

申请人： Byron Hassberg Lengsfield, III ,  Andreas Moser ,  Walter Eugene Weresin

发明人： Byron Hassberg Lengsfield, III ,  Andreas Moser ,  Walter Eugene Weresin

IPC分类号： G11B5/596

CPC分类号： G11B5/02 ,  B82Y10/00 ,  G11B5/596 ,  G11B5/743 ,  G11B5/82 ,  G11B2005/0005

摘要： An apparatus, system, and method are disclosed for writing magnetically encoded data. A servo module positions a write head relative to a first land such that a first edge of the write head is positioned substantially over a first land edge of the first land. The write head has a radial width greater than the sum of a radial width of the first land and radial widths of interior and exterior grooves such that the write head is also positioned over at least a portion of a second adjacent land. The write head writes magnetically encoded data to the first land. The servo module further positions the write head relative to a second land such that the first edge of the write head is positioned substantially over a second land edge of the second land and the write head is not positioned over the first land.

摘要翻译： 公开了用于写入磁编码数据的装置，系统和方法。 伺服模块相对于第一焊盘定位写入头，使得写入头的第一边缘基本上位于第一焊盘的第一焊盘边缘上。 写头具有大于第一平台的径向宽度和内部和外部凹槽的径向宽度之和的径向宽度，使得写入头也位于第二相邻平台的至少一部分上方。 写头将磁编码数据写入第一个地。 伺服模块还使写入头相对于第二焊盘定位，使得写入头的第一边缘基本上位于第二焊盘的第二焊盘边缘上，并且写入头不位于第一焊盘的上方。

公开(公告)号：US07894159B2

公开(公告)日：2011-02-22

申请号：US11737707

申请日：2007-04-19

申请人： Byron Hassberg Lengsfield, III ,  James Terrence Olson ,  Thomas Dudley Boone, Jr. ,  Petrus Antonius Van Der Heijden

发明人： Byron Hassberg Lengsfield, III ,  James Terrence Olson ,  Thomas Dudley Boone, Jr. ,  Petrus Antonius Van Der Heijden

IPC分类号： G11B5/127

CPC分类号： G11B5/3116 ,  G11B5/11 ,  G11B5/1278 ,  G11B5/3146 ,  G11B5/315

摘要： A magnetic write head having independent trailing and side magnetic shields. The side shields and trailing shields are independently of one another so that they can have throat heights that are different from one another. This advantageously allows the magnetic potential between the write pole and side shields to be controlled independently of one another without relying on the side gap and trailing gap thicknesses. Furthermore, magnetic performance of the write head can be improved because the side shields can be constructed with varying tapered throat heights, while the throat height of the trailing shield can remain constant.

摘要翻译： 具有独立尾部和侧面磁屏蔽的磁性写入头。 侧护罩和后挡板彼此独立，使得它们可以具有彼此不同的喉部高度。 这有利地允许写磁极和侧屏蔽之间的磁电势彼此独立地控制，而不依赖于侧间隙和后隙间隙。 此外，可以改善写头的磁性能，因为侧屏可以构造成具有变化的锥形喉部高度，而后屏蔽的喉部高度可以保持恒定。

公开(公告)号：US07532432B2

公开(公告)日：2009-05-12

申请号：US11379858

申请日：2006-04-24

申请人： Yoshihiro Ikeda ,  Byron Hassberg Lengsfield, III ,  James Terrence Olson ,  Petrus Antonius VanDerHeijden

发明人： Yoshihiro Ikeda ,  Byron Hassberg Lengsfield, III ,  James Terrence Olson ,  Petrus Antonius VanDerHeijden

IPC分类号： G11B5/127 ,  G11B5/23

CPC分类号： G11B5/3116 ,  G11B5/11 ,  G11B5/1278 ,  G11B5/3146 ,  G11B5/667

摘要： A perpendicular magnetic recording data storage system combines a perpendicular medium that has a thin low-magnetic-permeability or “soft” underlayer (SUL) with a recording head that has a trailing shield (TS) with a thick throat height, i.e., a thickness in a direction orthogonal to the recording layer of the medium. The SUL is thin enough and has a low enough magnetic permeability to become saturated in a region beneath the trailing gap of the head during writing, but the throat height of the TS is thick enough to prevent the TS from becoming magnetically saturated during writing. The magnetic saturation of the SUL during writing changes the magnetic reluctance such that more of the magnetic flux going through the SUL changes direction (“field undershoot”) and goes to the TS. If the permeability of the SUL is so low (e.g., close to unity) that the SUL does not magnetically saturate, field undershoot may still occur because the reluctance from the SUL to the TS is still smaller than the reluctance from the SUL to the return pole (RP). Field undershoot enables a high write field gradient, which results in narrower magnetic transitions.

摘要翻译： 垂直磁记录数据存储系统将具有薄的低磁导率或“软”底层（SUL）的垂直介质与具有厚的喉部高度的后挡板（TS）的记录头组合，即厚度 在与介质的记录层正交的方向上。 SUL足够薄并且在写入期间具有足够低的磁导率以在头部的拖尾间隙下方的区域饱和，但是TS的喉部高度足够厚以防止TS在写入期间变得磁饱和。 在写入期间SUL的磁饱和度改变磁阻，使得穿过SUL的更多的磁通量改变方向（“场下冲”）并且进入TS。 如果SUL的磁导率如此低（例如，接近于1），SUL不会磁饱和，则由于从SUL到TS的磁阻仍然小于从SUL到返回的磁阻，所以仍然可能发生场下冲 杆（RP）。 场下冲可实现高写磁场梯度，从而导致较小的磁转变。