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    • 9. 发明授权
    • Disk preconditioning apparatus and related method
    • 磁盘预处理装置及相关方法
    • US08009403B1
    • 2011-08-30
    • US11523357
    • 2006-09-19
    • Michael MallaryDavid Peterson
    • Michael MallaryDavid Peterson
    • H01F13/00H01H47/00
    • G11B5/0245G11B5/84
    • An apparatus and method for preconditioning a magnetic recording disk is provided in which two substantially identical, but opposing, pancake coils are disposed generally parallel to one another with a gap therebetween into which a disk to be preconditioned is inserted. A large pulse of current is delivered to the coils to generate a magnetic field that is sufficiently strong to precondition the disk. The radial fields of each respective pancake coil add together in the gap where the disk is located, and the field presets both the data layer and the hard bias layer of the SUL. Outside of the gap region, the fields cancel one another such that there are essentially no perpendicular fields due to the symmetry of the coils, such that there is very little net residual perpendicular magnetization when the disk is removed from the gap. An electrical circuit for producing the current pulse is provided. An aluminum support structure provides thermal management and magnetic flux conductivity for the system.
    • 提供了一种用于预处理磁记录盘的装置和方法,其中两个基本相同但相对的煎饼线圈大体上彼此平行设置,其间具有间隙,待预处理的盘被插入到该间隙中。 将大的电流脉冲传送到线圈以产生足够强的磁场以预处理磁盘。 每个相应的煎饼线圈的径向场在盘所在的间隙中加在一起,并且场预设SUL的数据层和硬偏置层。 在间隙区域之外,场相互抵消,使得由于线圈的对称性基本上不存在垂直场,使得当盘从间隙移除时,非常少的净残余垂直磁化强度。 提供用于产生电流脉冲的电路。 铝支撑结构为系统提供热管理和磁通量传导。