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    • 7. 发明授权
    • Magnetic head
    • 磁头
    • US6108167A
    • 2000-08-22
    • US150926
    • 1998-09-10
    • Kohichi TateyamaHiroaki YodaTadahiko KobayashiHiromi SakataMichiko HaraAkio HoriTakashi KoizumiTomohiko Nagata
    • Kohichi TateyamaHiroaki YodaTadahiko KobayashiHiromi SakataMichiko HaraAkio HoriTakashi KoizumiTomohiko Nagata
    • G11B5/31G11B5/39G11B5/187
    • G11B5/3109G11B5/3146G11B5/3153G11B5/3116G11B5/3163G11B5/3967
    • At least one magnetic pole out of a pair of magnetic poles is provided with a T-shaped magnetic pole having a magnetic pole chip at the position contacting with a magnetic gap and an auxiliary magnetic pole which is wider than thereof. The proximity of an air bearing surface of the T-shaped magnetic pole is composed of a laminated film containing a magnetic material layer with a high saturated magnetic flux density which composes the magnetic pole chip and a portion of the auxiliary magnetic pole and a magnetic material layer with a low saturated magnetic flux density which composes the remaining portion of the auxiliary magnetic pole. When the front portion of the magnetic pole with the track width of 1.8 .mu.m or less is composed of a laminated film containing a magnetic material layer having a high saturated magnetic flux density and a magnetic material layer having a low saturated magnetic flux density, the thickness of the magnetic material layer having the high saturated magnetic flux density is 0.5 .mu.m or more. According to the above described magnetic pole, the magnetic saturation near the tip portion of the magnetic pole is controlled, so that preferable magnetic field strength and magnetic field gradient can be attained when the track width is narrowed.
    • 在一对磁极中的至少一个磁极设置有在与磁隙接触的位置处具有磁极片的T形磁极和比其宽的辅助磁极。 T形磁极的空气轴承表面的接近度由包含构成磁极片和辅助磁极的一部分的磁性材料层和具有高饱和磁通密度的磁性材料层的叠层膜构成, 具有构成辅助磁极的剩余部分的低饱和磁通密度的层。 当轨道宽度为1.8μm或更小的磁极的前部由包含具有高饱和磁通密度的磁性材料层和具有低饱和磁通密度的磁性材料层的层叠膜构成时, 具有高饱和磁通密度的磁性材料层的厚度为0.5μm以上。 根据上述磁极,控制磁极尖端部附近的磁饱和,从而当磁道宽度变窄时可以获得优选的磁场强度和磁场梯度。