公开(公告)号：US6163442A

公开(公告)日：2000-12-19

申请号：US268551

申请日：1999-03-15

申请人： Hardayal Singh Gill ,  Edward HinPong Lee ,  Michael Salo ,  Joseph Francis Smyth ,  John David Westwood ,  Samuel Wonder Yuan

发明人： Hardayal Singh Gill ,  Edward HinPong Lee ,  Michael Salo ,  Joseph Francis Smyth ,  John David Westwood ,  Samuel Wonder Yuan

IPC分类号： G11B5/00 ,  G11B5/012 ,  G11B5/31 ,  G11B5/39 ,  G11B19/04 ,  G11B5/127 ,  G11B5/33

CPC分类号： G11B5/3156 ,  G11B5/012 ,  G11B5/3113 ,  G11B5/3967 ,  G11B19/04 ,  G11B2005/0008

摘要： A high moment bilayer first pole piece layer of a write head has high magnetic stability for promoting read signal symmetry of a read sensor of a read head. The bilayer first pole piece layer has a first layer of nickel iron and a second layer of iron nitride. The iron nitride has a high magnetic moment for conducting more flux per volume than the nickel iron first layer. In a first aspect of the invention, the nickel iron first layer is highly stabilized by providing it with a negative magnetostriction so that a stress induced anisotropy (H.sub.K) supports an intrinsic uniaxial anisotropy (H.sub.K) of the nickel iron first layer. The iron nitride second layer is formed directly on the nickel iron first layer so that by magnetic coupling the iron nitride second layer has significantly improved magnetic stability. In a second aspect of the invention the iron nitride second layer is provided with a positive magnetostriction which still further increases the magnetic stability of the bilayer first pole piece layer. In a preferred embodiment a net magnetostriction is zero or near zero. Each aspect of the invention improves the asymmetry sigma of the read head.

摘要翻译： 写头的高倍数双层第一极片层具有高的磁稳定性，用于提高读取头的读取传感器的读取信号对称性。 双层第一极片层具有第一层镍铁和第二层氮化铁。 氮化铁具有高的磁矩，用于比镍铁第一层传导更多的磁通量。 在本发明的第一方面，镍铁第一层通过提供负磁致伸缩来高度稳定，使得应力诱导各向异性（HK）支持镍铁第一层的固有单轴各向异性（HK）。 氮化铁第二层直接形成在镍铁第一层上，使得通过磁耦合，氮化铁第二层具有显着提高的磁稳定性。 在本发明的第二方面，氮化铁第二层被提供有正磁致伸缩，其进一步增加了双层第一极片层的磁稳定性。 在优选实施例中，净磁致伸缩为零或接近零。 本发明的每个方面改善了读取头的不对称性。

公开(公告)号：US6111406A

公开(公告)日：2000-08-29

申请号：US920033

申请日：1997-08-28

申请人： Glen Adam Garfunkel ,  Donald E. Horne ,  Michael Salo

发明人： Glen Adam Garfunkel ,  Donald E. Horne ,  Michael Salo

IPC分类号： G11B5/00 ,  G11B5/012 ,  G11B5/31 ,  G11B5/455 ,  G01R33/12 ,  G11B5/39

CPC分类号： G11B5/455 ,  G11B2005/0013 ,  G11B5/012 ,  G11B5/3166

摘要： A method for assessing write element performance in a combined magnetic head that also includes a magneto-resistive (MR) read element for a data storage drive includes exciting the write element with a square wave immediately after lapping the head during manufacture, before mounting the head for operation in the drive. The write element generates an output signal, and the output signal is detected by the read element and then used to determine whether the write element is defective. By using a square wave, temperature gradients in the head and inductive pick up is avoided, thereby facilitating the use of the read element as a test sensor.

摘要翻译： 一种用于评估组合磁头中的写入元件性能的方法，该组合磁头还包括用于数据存储驱动器的磁阻（MR）读取元件，包括在制造期间在研磨磁头之后立即激励具有方波的写入元件，然后安装磁头 用于在驱动器中操作。 写元件产生输出信号，并且读出元件检测输出信号，然后用于确定写元件是否有故障。 通过使用方波，避免了头部和感应拾取中的温度梯度，从而便于使用读取元件作为测试传感器。

公开(公告)号：US08120866B2

公开(公告)日：2012-02-21

申请号：US12511702

申请日：2009-07-29

申请人： Xiaodong Che ,  Zhen Jin ,  Michael Salo ,  Roger Wood

发明人： Xiaodong Che ,  Zhen Jin ,  Michael Salo ,  Roger Wood

IPC分类号： G11B27/36 ,  G11B5/03

CPC分类号： G11B5/59627 ,  G11B5/09

摘要： A method for characterizing a magnetic-recording system for the presence of adjacent-track interference and far-track interference. The method includes writing a plurality of repeating pulse-waveforms on a data track of a magnetic-recording disk at a write element of a magnetic-recording head. The method further includes reading a plurality of read-back signals from the magnetic-recording disk over a band of pseudo-data tracks offset from the data track by corresponding pseudo-data-track offsets in a radial direction of the magnetic-recording disk at a read element of the magnetic-recording head. In addition, the method includes displaying a magnetic-recording-signature map synthesized from the read-back signals from the magnetic-recording disk.

摘要翻译： 用于表征磁记录系统的方法，用于存在相邻磁道干扰和远磁道干扰。 该方法包括在磁记录头的写入元件的磁记录盘的数据轨道上写入多个重复的脉冲波形。 该方法还包括：在磁​​记录盘的数据轨道偏移的伪数据轨道的带上，通过磁记录盘的径向方向上的对应的伪数据轨偏移来读取多个读回信号， 磁记录头的读取元件。 此外，该方法包括显示从磁记录盘的回读信号合成的磁记录签名图。

公开(公告)号：US20110026154A1

公开(公告)日：2011-02-03

申请号：US12511702

申请日：2009-07-29

申请人： Xiaodong Che ,  Zhen Jin ,  Michael Salo ,  Roger Wood

发明人： Xiaodong Che ,  Zhen Jin ,  Michael Salo ,  Roger Wood

IPC分类号： G11B27/36 ,  G11B5/03

CPC分类号： G11B5/59627 ,  G11B5/09

摘要： A method for characterizing a magnetic-recording system for the presence of adjacent-track interference and far-track interference. The method includes writing a plurality of repeating pulse-waveforms on a data track of a magnetic-recording disk at a write element of a magnetic-recording head. The method further includes reading a plurality of read-back signals from the magnetic-recording disk over a band of pseudo-data tracks offset from the data track by corresponding pseudo-data-track offsets in a radial direction of the magnetic-recording disk at a read element of the magnetic-recording head. In addition, the method includes displaying a magnetic-recording-signature map synthesized from the read-back signals from the magnetic-recording disk.

摘要翻译： 用于表征磁记录系统的方法，用于存在相邻磁道干扰和远磁道干扰。 该方法包括在磁记录头的写入元件的磁记录盘的数据轨道上写入多个重复的脉冲波形。 该方法还包括：在磁​​记录盘的数据轨道偏移的伪数据轨道的带上，通过磁记录盘的径向方向上的对应的伪数据轨偏移来读取多个读回信号， 磁记录头的读取元件。 此外，该方法包括显示从磁记录盘的回读信号合成的磁记录签名图。

公开(公告)号：US06909674B2

公开(公告)日：2005-06-21

申请号：US10460836

申请日：2003-06-11

申请人： Yongho Ju ,  Michael Salo ,  Howard Gordon Zolla

发明人： Yongho Ju ,  Michael Salo ,  Howard Gordon Zolla

IPC分类号： G11B5/31 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/127 ,  G11B5/39 ,  G11B11/00

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/127 ,  G11B5/3133 ,  G11B5/3909 ,  G11B5/3967 ,  G11B2005/0005 ,  G11B2005/0021

摘要： A magnetic head system, and method for manufacturing a magnetic head are provided. Included is at least one layer and a heating element positioned adjacent the at least one layer. The at least one layer includes a plurality of sub-layers for providing an optimal thermal barrier.

摘要翻译： 提供一种磁头系统，以及制造磁头的方法。 包括至少一层和邻近该至少一层定位的加热元件。 至少一层包括用于提供最佳热障的多个子层。