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    • 4. 发明授权
    • Magnetic recording and reproducing method and magnetic recording medium employed for the same
    • 用于其的磁记录和再现方法和磁记录介质
    • US06791803B2
    • 2004-09-14
    • US10218569
    • 2002-08-15
    • Shinji SaitoNobuo YamazakiHitoshi Noguchi
    • Shinji SaitoNobuo YamazakiHitoshi Noguchi
    • G11B502
    • G11B5/714G11B5/70G11B5/70678Y10T428/257
    • Provided are a method of magnetic recording and reproducing capable of permitting high density recording on magnetic recording media even under the condition of high data transfer rates and yielding adequate recording and reproduction characteristics when an MR head is used in reproduction, and a magnetic recording medium capable of being used in this magnetic recording and reproducing method. The magnetic recording and reproducing method is a method for reproducing a signal magnetically recorded on a magnetic recording medium with a magnetoresistive (MR) head. The magnetic recording medium comprises a substantially nonmagnetic lower layer and a magnetic layer comprising a hexagonal ferrite ferromagnetic powder and a binder in this order on at least one side of a nonmagnetic support, in which said hexagonal ferrite ferromagnetic powder has a mean plate diameter ranging from 15 to 40 nm and a mean plate thickness ranging from 4 to 15 nm, and said magnetic layer has a coercive force Hc ranging from 143.3 to 318.4 kA/m, and said signal magnetically recorded has a maximum recording frequency ranging from 10 to 80 MHz.
    • 提供了一种磁记录和再现方法,即使在高数据传输速率的条件下也能够在磁记录介质上进行高密度记录,并且当在再现中使用MR磁头时产生足够的记录和再现特性,以及能够使用磁记录介质 被用于这种磁记录和再现方法中。 磁记录和再现方法是一种利用磁阻(MR)磁头再现磁记录在磁记录介质上的信号的方法。 磁记录介质在非磁性载体的至少一侧上依次包括基本上非磁性的下层和包含六方铁素体铁磁粉末和粘合剂的磁性层,其中所述六方晶系铁氧体铁磁粉末的平均板直径范围为 15至40nm,平均板厚度范围为4至15nm,所述磁性层的矫顽力Hc为143.3至318.4kA / m,磁性记录的所述信号具有10至80MHz的最大记录频率 。
    • 6. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US07515383B2
    • 2009-04-07
    • US11237973
    • 2005-09-29
    • Shinji SaitoHitoshi NoguchiNobuo Yamazaki
    • Shinji SaitoHitoshi NoguchiNobuo Yamazaki
    • G11B5/02G11B5/48G11B5/714
    • G11B5/70678G11B5/70G11B5/714
    • Provided is a magnetic recording medium exhibiting good electromagnetic characteristics in high-density recording The magnetic recording medium employed for magnetically recording signals with a track width equal to or less than 2.0 μm and reproducing the magnetically recorded signals, wherein said magnetic recording medium comprises a magnetic layer comprising a hexagonal ferrite ferromagnetic powder and a binder or comprises a nonmagnetic layer comprise a nonmagnetic powder and a binder and a magnetic layer comprising a hexagonal ferrite ferromagnetic powder and a binder in this order on a nonmagnetic support. Said magnetic layer has a thickness equal to or less than 0.2 μm, and said hexagonal ferrite ferromagnetic powder has an average plate diameter being 1/30 or less of the magnetically recorded track width as well as ½ or less of the thickness of the magnetic layer.
    • 提供了一种在高密度记录中表现出良好电磁特性的磁记录介质。磁记录介质,用于磁记录磁道宽度等于或小于2.0μm的信号,并再现磁记录信号,其中所述磁记录介质包括磁 包含六方晶系铁氧体铁磁性粉末和粘合剂的层或包含非磁性层的非磁性层在非磁性载体上依次包含非磁性粉末和粘合剂以及包含六方晶系铁磁铁磁性粉末和粘合剂的磁性层。 所述磁性层具有等于或小于0.2μm的厚度,并且所述六方晶系铁氧体铁磁粉末的平均板直径是磁记录磁道宽度的1/30或更小,以及磁层的厚度的1/2或更小 。