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    • 25. 发明授权
    • Methods for initializing and/or resetting GMR heads by applying oppositely directed magnetic fields
    • 通过施加相反方向的磁场来初始化和/或复位GMR磁头的方法
    • US06275028B1
    • 2001-08-14
    • US09220808
    • 1998-12-23
    • Takao MatsuiTatsuya EndoHiroaki SuzukiKenji KurokiKatsushi YamaguchiHideo Asano
    • Takao MatsuiTatsuya EndoHiroaki SuzukiKenji KurokiKatsushi YamaguchiHideo Asano
    • G11B539
    • B82Y25/00B82Y10/00G01R33/093G11B5/3166G11B5/3189G11B5/455G11B5/465G11B5/4806G11B2005/0008G11B2005/0016G11B2005/3996Y10T29/49034
    • In accordance with the present invention, the initialization for orienting the magnetized directions of the free layers of GMR heads (mounted on the diagonally shaded surface of sliders 14) by an external magnetic field is again executed also for the opposite direction, thereby to increase the yield of the GMR heads. Further, it is determined whether the magnetized direction of the pinned layer of GMR heads can be once reversed to the opposite direction, thereby to select damaged GMR heads at an early stage. Then, by performing a reset while performing a quasi-static test for seeing the read back response of the GMR head after restoring the magnetized direction of the pinned layer to a positive rotation, a safe and efficient reset is executed. The reset can be executed not only by applying only a pulse, but also while providing an external magnetic field in the pinning direction, or only by giving a high magnetic field. A tool 500 can be commonly used for the initialization, reset, or read back response through each process level. For the quasi-static test, coils 531, 532, and 533 are selectively used as Helmholz coils.
    • 根据本发明,用于通过外部磁场定向GMR磁头自由层(安装在滑块14的斜面阴影表面上)的磁化方向的初始化也对于相反方向也被执行,从而增加 产量的GMR头。 此外,确定GMR磁头的被钉扎层的磁化方向是否可以反向一个相反的方向,从而在早期阶段选择损坏的GMR磁头。 然后,通过在将被钉扎层的磁化方向恢复到正旋转之后执行用于观察GMR头的回读响应的准静态测试执行复位,执行安全且有效的复位。 该复位不仅可以通过仅施加脉冲而且可以在钉扎方向上提供外部磁场,或者仅通过施加高磁场来执行。 工具500可以通常用于通过每个处理级别的初始化,复位或回读响应。 对于准静态测试,线圈531,532和533被选择性地用作Helmholz线圈。
    • 28. 发明授权
    • Magnetic disk apparatus having recording heads for opposite disk
surfaces which are offset from each other
    • 具有彼此偏移的相对的盘表面的记录头的磁盘装置
    • US5296980A
    • 1994-03-22
    • US93294
    • 1993-07-16
    • Takao MatsuiYoshiaki Sonobe
    • Takao MatsuiYoshiaki Sonobe
    • G11B25/04G11B5/012G11B5/02G11B5/48G11B5/62G11B5/718G11B5/73G11B17/02
    • G11B5/4886G11B5/718G11B5/7305
    • Disclosed is a disk drive having at least one disk. An actuator arm carriers at least two sliders which are positioned over the first and second surface of the disk. The actuator arm moves the sliders to various selected positions over disks so that representations of data can be read from or written into the tracks of the disk. Each slider includes at least one magnetic transducer or magnetic head. The magnetic head is actually passed over the track in the disk during a read or write operation. The heads are shifted slightly with respect to a line perpendicular to the disk surface to minimize or reduce crosstalk and electromagnetic coupling between the heads located on the first and second surface of the disk. In other words, the heads are intentionally misaligned to increase the distance between the two heads and to reduce crosstalk and electromagnetic coupling between the two heads.
    • 公开了一种具有至少一个盘的磁盘驱动器。 致动器臂承载至少两个位于盘的第一和第二表面上方的滑块。 致动器臂将滑块移动到盘上的各种选定位置,以便数据的表示可以被读取或写入盘的轨道。 每个滑块包括至少一个磁换能器或磁头。 在读取或写入操作期间,磁头实际上通过磁盘中的磁道。 磁头相对于垂直于磁盘表面的线稍微移动,以最小化或减少位于磁盘的第一和第二表面上的磁头之间的串扰和电磁耦合。 换句话说,磁头有意地不对准以增加两个磁头之间的距离并且减少两个磁头之间的串扰和电磁耦合。