Method for measuring PES noise of servo patterned media
    51.
    发明授权
    Method for measuring PES noise of servo patterned media 失效
    测量伺服图案介质的PES噪声的方法

    公开(公告)号:US06853514B2

    公开(公告)日:2005-02-08

    申请号:US10167561

    申请日:2002-06-11

    IPC分类号: G11B5/596

    CPC分类号: G11B5/59633 G11B5/59611

    摘要: A method for measuring servo pattern irregularity and other servo information of pre-patterned servo media mounted on a spindle with the center of the pre-pattern tracks off center from the axis rotation of the spindle. An actuator is stepped radially while measuring the PES signals from the servo sectors of at least one highly eccentric track to form a cross track profile of the PES signals for each sector. A mathematical algorithm removes step measurement error from the data. A second mathematical algorithm removes non-repeatable random noise from the data. The amount of phase-in that radially aligns the respective cross track profiles is computed. Servo pattern written-in repeatable runout is determined by unwrapping the phase-in values to form a periodic curve.

    摘要翻译: 一种用于测量安装在主轴上的预先图案化伺服介质的伺服模式不规则性和其他伺服信息的方法,其中预模式轨迹的中心偏离主轴的轴线旋转的中心。 在测量来自至少一个高偏心轨道的伺服扇区的PES信号的同时,致动器是径向的,以形成每个扇区的PES信号的交叉轨道轮廓。 数学算法从数据中删除步长测量误差。 第二个数学算法从数据中去除不可重复的随机噪声。 计算径向对准各自的横向轨道轮廓的相位的量。 通过展开相位值以形成周期性曲线来确定写入可重复跳动的伺服模式。

    Polystyrene as a resist for making patterned media
    52.
    发明授权
    Polystyrene as a resist for making patterned media 有权
    聚苯乙烯作为制作图案化介质的抗蚀剂

    公开(公告)号:US06838227B2

    公开(公告)日:2005-01-04

    申请号:US10112214

    申请日:2002-03-29

    摘要: A system and method for forming servo patterns on magnetic media is disclosed. A magnetic film coated with a layer of polystyrene is stamped with a nickel stamper reproducing the negative image of the stamped pattern on the polystyrene. Ions are then accelerated towards the surface of the polystyrene, which stopps the ions in the areas where the polystyrene is thick and allows the ions to penetrate through to the magnetic layer in the areas where the polystyrene is thin. The ions, which penetrate through to the magnetic layer, interact with the magnetic layer altering the magnetic layer's structure reducing its coercivity (Hc) and remnant moment (Mrt). This reproduces the stamped polystyrene pattern on the magnetic layer. The polystyrene is then removed by oxygen plasma etching the surface leaving behind a patterned magnetic media.

    摘要翻译: 公开了一种用于在磁性介质上形成伺服图案的系统和方法。 涂覆有聚苯乙烯层的磁性薄膜上印有镍压模,其在聚苯乙烯上再现印模图案的负像。 离子然后被加速到聚苯乙烯的表面,聚苯乙烯的表面阻止聚苯乙烯厚的区域中的离子,并允许离子穿透到聚苯乙烯薄的区域中的磁性层。 穿透到磁性层的离子与磁性层相互作用,从而改变了磁层的结构,降低了矫顽力(Hc)和剩余力矩(Mrt)。 这再现了磁性层上的冲压聚苯乙烯图案。 然后通过氧等离子体蚀刻除去聚苯乙烯,留下图案化的磁性介质。