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    • 3. 发明授权
    • Characterizing magnetic recording parameters of a disk drive by evaluating track profile of dual microtracks
    • 通过评估双微轨道的轨迹轮廓来表征磁盘驱动器的磁记录参数
    • US08625224B1
    • 2014-01-07
    • US13464724
    • 2012-05-04
    • Enhao LinShaoping LiTao Pan
    • Enhao LinShaoping LiTao Pan
    • G11B5/02
    • G11B5/012G11B5/455G11B5/5534G11B5/59655
    • A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of tracks. The head is positioned over a track minus a first delta and a first frequency pattern is written at a first frequency. The head is positioned over the track plus a second delta and a second frequency pattern is written at a second frequency different from the first frequency. After writing the first frequency pattern and second frequency pattern, a third frequency pattern is written substantially centered on the track at a third frequency. After writing the third frequency pattern, the head is scanned across the track while reading the disk to generate a read signal. A first frequency component is extracted from the read signal representing the first frequency, and a second frequency component is extracted from the read signal representing the second frequency.
    • 公开了一种磁盘驱动器,包括在包括多个轨道的盘上致动的磁头。 头部位于轨道上减去第一增量,并且以第一频率写入第一频率模式。 头部位于轨道上方加上第二增量,第二频率图案以不同于第一频率的第二频率被写入。 在写入第一频率模式和第二频率模式之后,以第三频率将第三频率模式写入基本上以轨道为中心。 在写入第三频率模式之后,读取磁盘时头部扫描轨迹以产生读取信号。 从表示第一频率的读取信号中提取第一频率分量,并从表示第二频率的读取信号中提取第二频率分量。
    • 10. 发明授权
    • Layered perpendicular writer with pole tip partially embedded in yoke
    • 分层垂直写入器,极尖部分嵌入磁轭
    • US07382574B2
    • 2008-06-03
    • US11006202
    • 2004-12-06
    • Shaoping LiChunhong HouLei Wang
    • Shaoping LiChunhong HouLei Wang
    • G11B5/147
    • G11B5/1278
    • A perpendicular writer includes a write coil and a main pole having a pole tip for conducting magnetic flux to write data to a magnetic medium. The pole tip includes a plurality of magnetic layers that are magnetically coupled and biased so that their magnetic moment orientations are substantially parallel to an external surface when no write current is applied to the write coil. The pole tip is partially embedded in the yoke, such that portions of the yoke surrounding the pole tip help direct magnetic flux to the pole tip. The pole tip extends beyond the yoke, with a first end located outside the yoke and a second end located within the yoke.
    • 垂直写入器包括写入线圈和具有用于传导磁通以将数据写入磁性介质的极尖的主极。 极尖包括磁耦合和偏置的多个磁性层,使得当没有写入电流施加到写入线圈时,它们的磁矩取向基本上平行于外部表面。 极尖部分地嵌入在轭中,使得围绕极端部的轭的部分有助于将磁通量引导到极尖。 磁极尖端延伸超过磁轭,第一端位于磁轭外部,第二端位于磁轭内。