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1.发明授权
公开(公告)号：US5227212A
公开(公告)日：1993-07-13
申请号：US739565
申请日：1991-08-02
CPC分类号： G11B5/656 , G11B5/66 , Y10S428/90 , Y10S428/928 , Y10T428/12854
摘要： An improved CoPt based or CoNi based alloy magnetic recording disk for horizontal recording has a magnetic recording layer which is a laminated structure of relatively thin magnetic alloy films separated by relatively thin non-magnetic spacer films. The resulting laminated disk structure has substantially decreased intrinsic media noise at high linear recording densities. A magnetic recording disk drive uses the low noise laminated disk and and a magnetoresistive read sensor to provide a disk drive with significantly reduced noise in the data readback signal.
摘要翻译： 用于水平记录的改进的基于CoPt或CoNi的合金磁记录盘具有磁记录层，其是由相对薄的非磁性间隔膜分离的相对薄的磁性合金膜的叠层结构。 所得的层压盘结构在高线性记录密度下具有显着降低的本征介质噪声。 磁记录盘驱动器使用低噪声层叠盘和磁阻读取传感器来提供在数据回读信号中具有显着降低的噪声的磁盘驱动器。
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2.发明授权Thin film magnetic recording disk comprising alternating layers of a CoNi or CoPt alloy and a non-magnetic spacer layer 失效薄膜磁记录盘包括CoNi或CoPt合金和非磁性间隔层的交替层
公开(公告)号：US5051288A
公开(公告)日：1991-09-24
申请号：US324374
申请日：1989-03-16
CPC分类号： G11B5/656 , G11B5/66 , Y10S428/90 , Y10S428/926 , Y10S428/928 , Y10T428/12632 , Y10T428/12806
摘要： An improved CoPt based or CoNi based alloy magnetic recording disk for horizontal recording has a magnetic recording layer which is a laminated structure of relatively thin magnetic alloy films separated by relatively thin non-magnetic spacer films. The resulting laminated disk structure has substantially decreased intrinsic media noise at high linear recording densities.
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3.发明授权Process for fabricating thin film metal alloy magnetic recording disks to selectively variable coercivities 失效用于制造薄膜金属合金磁记录盘以选择性地可变矫顽力的方法
公开(公告)号：US5149409A
公开(公告)日：1992-09-22
申请号：US640182
申请日：1991-01-11
CPC分类号： G11B5/851 , C23C14/0036 , C23C14/0635
摘要： In the fabrication of thi film cobalt alloy magnetic recording disks by sputter-deposition, the coercivity of the disks can be selectively varied by introducing a predetermined amount of hydrocarbon gas, such as methane, into the argon-based sputtering atmosphere. The flow rate of the hydrocarbon gas into the sputtering chamber is directly related to the coercivity of the resulting disks. This permits the coercivity of the disks to be controlled without the necessity of changing the composition of the cobalt alloy sputtering targets, and without the necessity of changing the thickness of an underlying between the disk substrate and the magnetic layer. The use of hydrocarbon gas in the reactive sputtering of the cobalt alloy magnetic layer in the disks does not affect the intrinsic media noise of the disks, thus allowing for the manufacturing of disks with high signal-to-noise ratio (SNR) of the readback signal.
摘要翻译： 在通过溅射沉积制造薄膜钴合金磁记录盘的过程中，可以通过将预定量的烃气（例如甲烷）引入到氩基溅射气氛中来选择性地改变盘的矫顽力。 进入溅射室的烃气体的流速与所得到的盘的矫顽力直接相关。 这允许在不需要改变钴合金溅射靶的组成的情况下控制盘的矫顽力，并且不需要改变盘基片和磁性层之间的厚度。 在磁盘中的钴合金磁性层的反应性溅射中使用碳氢化合物气体不会影响磁盘的内在介质噪声，从而允许制造回读的高信噪比（SNR） 信号。
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公开(公告)号：US07924519B2
公开(公告)日：2011-04-12
申请号：US12240139
申请日：2008-09-29
申请人： Steven E. Lambert
发明人： Steven E. Lambert
IPC分类号： G11B27/36
CPC分类号： G11B5/59627 , G11B5/59633 , G11B5/59638
摘要： Monitoring of the eccentricity of a pre-formatted servo pattern on a disk.
摘要翻译： 监视预先格式化的伺服模式在磁盘上的偏心度。
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公开(公告)号：US20120300327A1
公开(公告)日：2012-11-29
申请号：US13115307
申请日：2011-05-25
IPC分类号： G11B27/36
CPC分类号： G11B5/59672
摘要： Systems and methods for improving accuracy of head positioning using existing servo patterns are provided. In one embodiment, a method for improving read head positioning is provided that comprises: writing a series of tracks over a range of read offsets to be calibrated; measuring a set of raw track profiles from the series of tracks; sampling the set of raw track profiles at a series of signal amplitude levels; constructing a reference track profile from the set of sampled track profiles; calculating a set of read offset deltas from each sampled track profile; merging the sets of read offset deltas into a set of average read offset deltas; and converting the set of average read offset deltas into a read offset correction table. A similar method for improving disk write head positioning is also provided which utilizes such a read offset correction table to eventually create write offset correction table.
摘要翻译： 提供了使用现有伺服模式提高磁头定位精度的系统和方法。 在一个实施例中，提供了一种用于改善读取头定位的方法，其包括：在待校准的读取偏移范围上写入一系列轨道; 从一系列轨道测量一组原始轨道轮廓; 在一系列信号幅度水平上对原始轨迹轮廓进行采样; 从所述采样的轨道轮廓集合中构造参考轨道轮廓; 从每个采样的轨道轮廓计算一组读取偏移量增量; 将读取偏移量三角形组合成一组平均读取偏移量三角形; 并将平均读取偏移量三角形的集合转换为读取偏移校正表。 还提供了一种用于改善磁盘写入头定位的类似方法，其利用这种读取偏移校正表来最终创建写偏移校正表。
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公开(公告)号：US08619381B2
公开(公告)日：2013-12-31
申请号：US13115307
申请日：2011-05-25
IPC分类号： G11B5/02
CPC分类号： G11B5/59672
摘要： Systems and methods for improving accuracy of head positioning using existing servo patterns are provided. In one embodiment, a method for improving read head positioning is provided that comprises: writing a series of tracks over a range of read offsets to be calibrated; measuring a set of raw track profiles from the series of tracks; sampling the set of raw track profiles at a series of signal amplitude levels; constructing a reference track profile from the set of sampled track profiles; calculating a set of read offset deltas from each sampled track profile; merging the sets of read offset deltas into a set of average read offset deltas; and converting the set of average read offset deltas into a read offset correction table. A similar method for improving disk write head positioning is also provided which utilizes such a read offset correction table to eventually create write offset correction table.
摘要翻译： 提供了使用现有伺服模式提高磁头定位精度的系统和方法。 在一个实施例中，提供了一种用于改善读取头定位的方法，其包括：在待校准的读取偏移范围上写入一系列轨道; 从一系列轨道测量一组原始轨道轮廓; 在一系列信号幅度水平上对原始轨迹轮廓进行采样; 从所述采样的轨道轮廓集合中构造参考轨道轮廓; 从每个采样的轨道轮廓计算一组读取偏移量增量; 将读取偏移量三角形组合成一组平均读取偏移量三角形; 并将平均读取偏移量三角形的集合转换为读取偏移校正表。 还提供了一种用于改善磁盘写入头定位的类似方法，其利用这种读取偏移校正表来最终创建写偏移校正表。
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公开(公告)号：US5206590A
公开(公告)日：1993-04-27
申请号：US625343
申请日：1990-12-11
申请人： Bernard Dieny , Bruce A. Gurney , Steven E. Lambert , Daniele Mauri , Stuart S. P. Parkin , Virgil S. Speriosu , Dennis R. Wilhoit
发明人： Bernard Dieny , Bruce A. Gurney , Steven E. Lambert , Daniele Mauri , Stuart S. P. Parkin , Virgil S. Speriosu , Dennis R. Wilhoit
CPC分类号： B82Y25/00 , B82Y10/00 , G01R33/093 , G01R33/096 , G11B5/3903 , G11B2005/0018 , G11B2005/3996
摘要： A magnetoresistive (MR) sensor comprising a first and a second thin film layer of a magnetic material separated by a thin film layer of a non-magnetic metallic material. The first ferromagnetic layer is magnetically soft. The magnetization direction of the first layer of magnetic material is set substantially perpendicular to the magnetization of the second layer of magnetic material at zero applied field, and the magnetization direction of the second layer of magnetic material is fixed. A current flow is produced through the MR sensor, and the variations in voltage across the MR sensor are sensed due to changes in resistance of the MR sensor produced by rotation of the magnetization in the first layer of magnetic material as a function of the magnetic field being sensed. The variation of the resistance with the angle between the magnetizations of the first and second layers of magnetic material has been defined as the spin valve (SV) effect. It is also shown that, by a suitable direction of the current with respect to the fixed magnetization, the (SV) magnetoresistance can be added constructively to the usual anisotropic magnetoresistance.
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