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    • 9. 发明授权
    • Magnetic recording medium with controlled grain diameters
    • 具有受控晶粒直径的磁记录介质
    • US08592061B2
    • 2013-11-26
    • US12443372
    • 2007-09-26
    • Takahiro OnoueAkira Shimada
    • Takahiro OnoueAkira Shimada
    • G11B5/65
    • G11B5/66G11B5/65
    • In order to provide a magnetic recording medium having excellent electromagnetic conversion characteristics, a magnetic recording medium (10) is provided with a substrate (12), and a magnetic recording layer (20) formed on the substrate (12). The magnetic recording layer (20) is provided with a granular layer (32), i.e., a magnetic layer, including magnetic grains and a nonmagnetic material surrounding the magnetic grains in a section parallel to the main surface of the substrate. The ratio of the long diameter to the short diameter of each magnetic grain contained in the granular layer (32) is calculated in the section. In the histogram of such ratio, a half width at half maximum of the histogram is 0.6 or less and the variance of grain diameters of the magnetic grains in the section is 20% or less of the average grain diameter of the magnetic grains.
    • 为了提供具有优异的电磁转换特性的磁记录介质,磁记录介质(10)设置有基板(12)和形成在基板(12)上的磁记录层(20)。 磁记录层(20)在平行于基板的主表面的部分中设置有包括磁性颗粒的磁性层(32),包括磁性颗粒的非磁性材料的磁性层(32)。 在该部分中计算包含在颗粒层(32)中的每个磁性颗粒的长径与短径的比率。 在该比率的直方图中,直方图的半值半宽度为0.6以下,截面中的磁性粒子的粒径的变化为磁性粒子的平均粒径的20%以下。