公开(公告)号：US20190034574A1

公开(公告)日：2019-01-31

申请号：US16046957

申请日：2018-07-26

申请人： Ningjia Zhu

发明人： Ningjia Zhu

IPC分类号： G06F17/50

摘要： The independent claims of this patent signify a concise description of embodiments. New techniques for the partitioning of big element blocks in a circuit are disclosed. The techniques partition both pre-layout and post-layout circuits. If a post-layout circuit has different simulation results from a pre-layout circuit, the techniques determine where and how “cross-talk” of the RC networks due to RC extraction is changing the circuit physics behavior from the original design of the circuit. A flow of the local circuit simulation of the pre-layout netlist and the post-layout netlist of the same design is presented. A flow of reference or relative or differential circuit simulation of a known design and a new design of the same kind is described. This Abstract is not intended to limit the scope of the claims.

公开(公告)号：US06456465B1

公开(公告)日：2002-09-24

申请号：US09436979

申请日：1999-11-09

申请人： Ernest Anthony Louis ,  Ningjia Zhu ,  Peter Ispvan Bonyhard

发明人： Ernest Anthony Louis ,  Ningjia Zhu ,  Peter Ispvan Bonyhard

IPC分类号： G11B539

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/3903 ,  G11B5/3912 ,  G11B5/398 ,  G11B2005/3996

摘要： A method and system for providing a magnetoresistive head that reads data from a recording media is disclosed. The method and system include providing a first shield, a second shield, a magnetoresistive sensor, and a lead. The first shield has a first end, a central portion and a second end. The first end is closer to the recording media during use than the second end. The second shield has a first end, a central portion, and a second end. The first end of the second shield is separated from the first end of the first shield by a read gap. The central portion of the second shield is separated from the central portion of the first shield by a distance that is greater than the read gap. The magnetoresistive sensor is disposed between the first shield and the second shield and has a front end and a back end. The front end of the magnetoresistive sensor is electrically coupled with the first end of the first shield or the first end of the second shield. The lead is electrically coupled with the back end of the magnetoresistive sensor. Thus, current is driven through the magnetoresistive sensor in a direction substantially perpendicular to the recording media during use.

摘要翻译： 公开了一种用于提供从记录介质读取数据的磁阻头的方法和系统。 该方法和系统包括提供第一屏蔽，第二屏蔽，磁阻传感器和引线。 第一屏蔽具有第一端，中心部分和第二端。 第一端在使用时比第二端更靠近记录介质。 第二屏蔽具有第一端，中心部分和第二端。 第二屏蔽的第一端与第一屏蔽的第一端分开一个读取的间隙。 第二屏蔽件的中心部分与第一屏蔽件的中心部分分开大于读取间隙的距离。 磁阻传感器设置在第一屏蔽和第二屏蔽之间，并且具有前端和后端。 磁阻传感器的前端与第一屏蔽的第一端或第二屏蔽的第一端电耦合。 引线与磁阻传感器的后端电耦合。 因此，在使用期间，电流在大致垂直于记录介质的方向上通过磁阻传感器驱动。

公开(公告)号：US07289303B1

公开(公告)日：2007-10-30

申请号：US09828635

申请日：2001-04-05

申请人： Kyusik Sin ,  Ningjia Zhu ,  Yingjian Chen

发明人： Kyusik Sin ,  Ningjia Zhu ,  Yingjian Chen

IPC分类号： G11B5/39

CPC分类号： G11B5/3932 ,  B82Y25/00 ,  G01R33/093 ,  H01F10/3272 ,  Y10T428/1107 ,  Y10T428/1121 ,  Y10T428/1143

摘要： Magnetoresistive (MR) sensors are disclosed having mechanisms for reducing edge effects such as Barkhausen noise. The sensors include a pinned layer and a free layer with an exchange coupling layer adjoining the free layer, and a ferromagnetic layer having a fixed magnetic moment adjoining the exchange coupling layer. The exchange coupling layer and ferromagnetic layer form a synthetic antiferromagnetic structure with part of the free layer, providing bias that reduces magnetic instabilities at edges of the free layer. Such synthetic antiferromagnetic structures can provide a stronger bias than conventional antiferromagnetic layers, as well as a more exactly defined track width than conventional hard magnetic bias layers. The synthetic antiferromagnetic structures can also provide protection for the free layer during processing, in contrast with the trimming of conventional antiferromagnetic layers that exposes if not removes part of the free layer.

摘要翻译： 公开了具有减小诸如巴克豪森噪声等边缘效应的机构的磁阻（MR）传感器。 传感器包括钉扎层和具有邻接自由层的交换耦合层的自由层，以及具有与交换耦合层邻接的固定磁矩的铁磁层。 交换耦合层和铁磁层形成具有部分自由层的合成反铁磁结构，提供降低自由层边缘的磁性不稳定性的偏压。 这种合成反铁磁结构可以提供比常规反铁磁层更强的偏压，以及比常规硬磁偏置层更精确地定义的轨道宽度。 合成反铁磁性结构也可以在加工过程中为自由层提供保护，与如果不除去部分自由层的常规反铁磁层的修整相反。

公开(公告)号：US06447935B1

公开(公告)日：2002-09-10

申请号：US09447944

申请日：1999-11-23

申请人： Jing Zhang ,  Ningjia Zhu ,  Yiming Huai ,  Amritpal Singh Rana ,  Wenjie Chen

发明人： Jing Zhang ,  Ningjia Zhu ,  Yiming Huai ,  Amritpal Singh Rana ,  Wenjie Chen

IPC分类号： G11B566

CPC分类号： B82Y10/00 ,  G11B5/3903 ,  G11B5/3932 ,  Y10S428/90 ,  Y10T428/11 ,  Y10T428/1121

摘要： A method and system for providing a spin valve for use in a magnetoresistive head is disclosed. The method and system include providing a synthetic pinned layer, a nonmagnetic spacer layer, and a free layer. The free layer has a first magnetization canted from a first direction by a first angle. The nonmagnetic spacer layer is disposed between the free layer and the synthetic pinned layer. The synthetic pinned layer has a second magnetization in a second direction. The second direction is canted from a third direction that is transverse to the first direction by a second angle. The second magnetization is substantially orthogonal to the first magnetization.

摘要翻译： 公开了一种用于提供用于磁阻头的自旋阀的方法和系统。 该方法和系统包括提供合成钉扎层，非磁性间隔层和自由层。 自由层具有从第一方向倾斜第一角度的第一磁化。 非磁性间隔层设置在自由层和合成钉扎层之间。 合成钉扎层在第二方向上具有第二磁化强度。 第二方向从与第一方向横向的第三方向倾斜第二角度。 第二磁化强度基本上与第一磁化正交。

公开(公告)号：US06222707B1

公开(公告)日：2001-04-24

申请号：US09221799

申请日：1998-12-28

申请人： Yiming Huai ,  Geoffrey Anderson ,  Ningjia Zhu ,  Wenjie Chen ,  Fuminori Hikami

发明人： Yiming Huai ,  Geoffrey Anderson ,  Ningjia Zhu ,  Wenjie Chen ,  Fuminori Hikami

IPC分类号： G11B539

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/3954 ,  H01F10/3263 ,  H01F10/3268

摘要： A system and method for providing a spin valve is disclosed. The spin valve is formed on a substrate. In one aspect, the method and system include providing a seed layer including NiFe above the substrate and providing an antiferromagnetic layer on the seed layer. The seed layer provides the desired texture for the antiferromagnetic layer. The seed layer could include NiFeCr, NiFeNb, NiFeRh, or a NiFe/Cu multilayer. The method and system further include providing a pinned layer above the antiferromagnetic layer, the pinned layer being exchange coupled to the antiferromagnetic layer, providing a spacer layer above the pinned layer and providing a free layer above the spacer layer. In a second aspect, the method and system include providing a seed layer including Cu instead of NiFe. In a third aspect, the method and system include providing a synthetic antiferromagnetic layer in lieu of the antiferromagnetic layer and the pinned layer. In this aspect, the seed layer provides the desired texture for the synthetic antiferromagnetic layer. Note that in any aspect, the spin valve can include a bottom spin valve or a dual spin valve.

摘要翻译： 公开了一种用于提供自旋阀的系统和方法。 自旋阀形成在基板上。 在一个方面，所述方法和系统包括提供在衬底上方包括NiFe的种子层，并在种子层上提供反铁磁性层。 种子层为反铁磁层提供所需的纹理。 种子层可以包括NiFeCr，NiFeNb，NiFeRh或NiFe / Cu多层。 所述方法和系统还包括在反铁磁层上提供钉扎层，所述被钉扎层与所述反铁磁层交换耦合，在所述被钉扎层上方提供间隔层并在所述间隔层上方提供自由层。 在第二方面，所述方法和系统包括提供包含Cu而不是NiFe的种子层。 在第三方面，该方法和系统包括提供代替反铁磁层和被钉扎层的合成反铁磁层。 在这方面，种子层为合成反铁磁层提供所需的纹理。 注意，在任何方面，自旋阀可以包括底部自旋阀或双自旋阀。

公开(公告)号：US08463587B2

公开(公告)日：2013-06-11

申请号：US12511030

申请日：2009-07-28

申请人： Ningjia Zhu ,  James Bair ,  Zhishi Peng

发明人： Ningjia Zhu ,  James Bair ,  Zhishi Peng

IPC分类号： G06F17/50

CPC分类号： G06F17/5022 ,  G06F17/5036 ,  G06F2217/74

摘要： A method of simulating an integrated circuit design is provided. In this method, a node order ranking of nodes in a netlist can be determined. Circuits of the netlist can then be partitioned based on the node order ranking with both static current driving and dynamic current driving schemes. A hierarchical data structure can be built based on the node order partitioning. In one embodiment, intermediate node orders can be dynamically merged for simulation optimization. Then, the circuits can be re-partitioned based on one or more merged intermediate node orders. Solving and integration can be performed using the hierarchical data structure to generate an order-ranked hierarchy engine. Analysis on the order-ranked hierarchy engine can be performed. At this point, simulation data of the IC design can be exported based on the analysis. By using this method, linear network reduction with its attendant accuracy loss is unnecessary.

摘要翻译： 提供了一种模拟集成电路设计的方法。 在该方法中，可以确定网表中的节点的节点顺序排列。 网表的电路然后可以基于静态电流驱动和动态电流驱动方案的节点顺序分级。 可以基于节点顺序分区构建分层数据结构。 在一个实施例中，可以动态地合并中间节点订单以进行模拟优化。 然后，可以基于一个或多个合并的中间节点顺序对电路进行重新划分。 可以使用分层数据结构来执行解决和集成，以生成排序级别的引擎。 可以执行对排序级别引擎的分析。 此时，可以根据分析导出IC设计的仿真数据。 通过使用这种方法，不需要线性网络减少及其伴随的精度损失。

公开(公告)号：US20110029299A1

公开(公告)日：2011-02-03

申请号：US12511030

申请日：2009-07-28

申请人： Ningjia Zhu ,  James Bair ,  Zhishi Peng

发明人： Ningjia Zhu ,  James Bair ,  Zhishi Peng

IPC分类号： G06F17/50

CPC分类号： G06F17/5022 ,  G06F17/5036 ,  G06F2217/74

摘要： A method of simulating an integrated circuit design is provided. In this method, a node order ranking of nodes in a netlist can be determined. Circuits of the netlist can then be partitioned based on the node order ranking with both static current driving and dynamic current driving schemes. A hierarchical data structure can be built based on the node order partitioning. In one embodiment, intermediate node orders can be dynamically merged for simulation optimization. Then, the circuits can be re-partitioned based on one or more merged intermediate node orders. Solving and integration can be performed using the hierarchical data structure to generate an order-ranked hierarchy engine. Analysis on the order-ranked hierarchy engine can be performed. At this point, simulation data of the IC design can be exported based on the analysis. By using this method, linear network reduction with its attendant accuracy loss is unnecessary.

摘要翻译： 提供了一种模拟集成电路设计的方法。 在该方法中，可以确定网表中的节点的节点顺序排列。 网表的电路然后可以基于静态电流驱动和动态电流驱动方案的节点顺序分级。 可以基于节点顺序分区构建分层数据结构。 在一个实施例中，可以动态地合并中间节点订单以进行模拟优化。 然后，可以基于一个或多个合并的中间节点顺序对电路进行重新划分。 可以使用分层数据结构来执行解决和集成，以生成排序级别的引擎。 可以执行对排序级别引擎的分析。 此时，可以根据分析导出IC设计的仿真数据。 通过使用这种方法，不需要线性网络减少及其伴随的精度损失。

公开(公告)号：US07027268B1

公开(公告)日：2006-04-11

申请号：US09351743

申请日：1999-07-08

申请人： Ningjia Zhu ,  Yiming Huai

发明人： Ningjia Zhu ,  Yiming Huai

IPC分类号： G11B5/39

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G01R33/093 ,  G11B5/3932 ,  G11B2005/3996

摘要： A method and system for providing a magnetoresistive sensor is disclosed. The method and system include providing a first pinned layer, providing a free layer having a length, and providing a first spacer layer disposed between the first pinned layer and the free layer. The first spacer layer has a first interface with the first pinned layer. The method and system also include providing a second pinned layer and providing a second spacer layer disposed between the free layer and the second pinned layer. The second spacer layer has a second interface with the second pinned layer. A direction of a current passed through the magnetoresistive sensor is through the first interface, through the second interface, and along at least a portion of the length of the free layer.

摘要翻译： 公开了一种用于提供磁阻传感器的方法和系统。 该方法和系统包括提供第一被钉扎层，提供具有长度的自由层，并且提供设置在第一被钉扎层和自由层之间的第一间隔层。 第一间隔层具有与第一被钉扎层的第一界面。 该方法和系统还包括提供第二被钉扎层并且提供设置在自由层和第二钉扎层之间的第二间隔层。 第二间隔层具有与第二被钉扎层的第二界面。 通过磁阻传感器的电流的方向通过第一界面，通过第二界面，并沿自由层的长度的至少一部分。

公开(公告)号：US06381105B1

公开(公告)日：2002-04-30

申请号：US09426171

申请日：1999-10-22

申请人： Yiming Huai ,  Geoff Anderson ,  Mahendra Pakala ,  Wenjie Chen ,  Ningjia Zhu

发明人： Yiming Huai ,  Geoff Anderson ,  Mahendra Pakala ,  Wenjie Chen ,  Ningjia Zhu

IPC分类号： G11B539

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G01R33/093 ,  G11B5/3903 ,  G11B5/3954 ,  G11B5/3967

摘要： A hybrid dual spin valve sensor includes a standard spin valve sharing a common free layer with a synthetic spin valve. The standard spin valve consists of a first antiferromagnetic layer having a first blocking temperature, a first soft ferromagnetic layer, a first spacer layer, and the common free layer. The synthetic spin valve consists of the common free layer, a second spacer, a second soft ferromagnetic layer, a third spacer layer, a third soft ferromagnetic layer, and a second antiferromagnetic layer having a second blocking temperature. Each of the two antiferromagnetic layers has a fixed magnetization orientation antiparallel to the other. A lead set configured to pass a sensing current from a current source through the hybrid dual spin valve, and a sensing circuit configured to measure changes in resistance within the hybrid dual spin valve, complete the sensor. A method for producing a hybrid dual spin valve sensor includes providing such a sensor wherein the magnetization orientations of the two antiferromagnetic layers are disordered, followed by processing at a first temperature and a second temperature. Processing at the first temperature is used to set the magnetization orientation of the antiferromagnetic layer with the higher blocking temperature. Processing at a lower second temperature is used to set the magnetization orientation of the antiferromagnetic layer with the lower blocking temperature such that it is antiparallel to the magnetization orientation of the antiferromagnetic layer with the higher blocking temperature.

摘要翻译： 混合双自旋阀传感器包括与合成自旋阀共用共用自由层的标准自旋阀。 标准自旋阀由具有第一阻挡温度的第一反铁磁层，第一软铁磁层，第一间隔层和公共自由层组成。 合成自旋阀由公共自由层，第二间隔物，第二软铁磁层，第三间隔层，第三软铁磁层和具有第二阻挡温度的第二反铁磁层组成。 两个反铁磁层中的每一个具有反平行于另一个的固定磁化取向。 配置成将来自电流源的感测电流通过混合双自旋阀的引线组以及被配置为测量混合双自旋阀内的电阻变化的感测电路，完成传感器。 一种用于制造混合双自旋阀传感器的方法包括提供这样的传感器，其中两个反铁磁层的磁化取向是无序的，随后在第一温度和第二温度下进行处理。 使用第一温度的加工来设定具有较高阻断温度的反铁磁性层的磁化取向。 在较低的第二温度下的处理用于设置具有较低阻挡温度的反铁磁层的磁化取向，使得其与具有较高阻挡温度的反铁磁层的磁化取向反平行。