公开(公告)号：US08339749B2

公开(公告)日：2012-12-25

申请号：US12313410

申请日：2008-11-19

申请人： Masafumi Mochizuki ,  Hideaki Maeda ,  Shuji Nishida ,  Takaaki Izumida

发明人： Masafumi Mochizuki ,  Hideaki Maeda ,  Shuji Nishida ,  Takaaki Izumida

IPC分类号： G02B5/32 ,  G02F1/00

CPC分类号： G11B5/3116 ,  B82Y10/00 ,  B82Y25/00 ,  G11B5/1278 ,  G11B5/3909 ,  G11B5/3967 ,  G11B2005/3996

摘要： Embodiments of the invention reduce generation of a magnetic field with a polarity reverse to that of the recording magnetic field, without deteriorating a gradient in the magnetic field. An embodiment of a magnetic disk device according to the present invention suppresses deviation and erase of already recorded data. In an embodiment, the perpendicular magnetic recording head includes the main magnetic pole, an auxiliary magnetic pole, a trailing shield disposed on the trailing side of the main magnetic pole with a non-magnetic film placed in-between, and side shields disposed on both the sides of the main magnetic pole in the direction of the track width with a non-magnetic film placed in-between. The trailing shield has on the trailing side a portion where film thickness is thinner on the trailing side than the thickness of its element in the height direction in its position facing the main magnetic pole. Adoption of this configuration allows suppression of generation of the magnetic field having a polarity reverse to that of the recording magnetic field, without deteriorating the magnetic field gradient. Also in the portion where the side shields face the main magnetic pole, the side shields have the portion where the film is thinned down in thickness.

摘要翻译： 本发明的实施例减少了与记录磁场相反极性的磁场的产生，而不会使磁场中的梯度恶化。 根据本发明的磁盘装置的实施例抑制已经记录的数据的偏差和擦除。 在一个实施例中，垂直磁记录头包括主磁极，辅助磁极，设置在主磁极的后侧的后屏蔽件，其中放置有非磁性薄膜和设置在两者上的侧屏蔽 主磁极的侧面在磁道宽度方向上放置非磁性膜。 后挡板在其后侧具有在其后侧的膜厚度比其元件在其与主磁极相对的位置的高度方向上的厚度更薄的部分。 采用这种配置允许抑制具有与记录磁场相反的极性的磁场的产生，而不会降低磁场梯度。 另外在侧面屏蔽面对主磁极的部分，侧面屏蔽部分的薄膜部分厚度变薄。

公开(公告)号：US20090168241A1

公开(公告)日：2009-07-02

申请号：US12315810

申请日：2008-12-04

申请人： Masafumi Mochizuki ,  Hideaki Maeda ,  Shuji Nishida ,  Takaaki Izumida

发明人： Masafumi Mochizuki ,  Hideaki Maeda ,  Shuji Nishida ,  Takaaki Izumida

IPC分类号： G11B5/127

CPC分类号： G11B5/3116 ,  G11B5/1278

摘要： Embodiments of the present invention help to inhibit record information in a perpendicular magnetic recording disk drive from being attenuated or erased due to leakage of a recording magnetic field into the already-recorded information. According to one embodiment, a magnetic disk includes a soft magnetic underlayer and a magnetic recording layer. A magnetic head includes a main magnetic pole, an auxiliary magnetic pole, a trailing shield which is disposed via a non-magnetic film on a trailing side of the main magnetic pole and in which a reverse side is in contact with the auxiliary magnetic pole, and side shields disposed on both sides of the main magnetic pole. Herein, where a saturation magnetic flux density of the soft magnetic underlayer is BsSUL and a film thickness thereof is tSUL; a saturation magnetic flux density of the trailing shield and side shields is Bsshield and a film thickness thereof is tshield; and the number of sides of the trailing shield and the side shields, which sides oppose the main magnetic pole, is C1, conditions are set so as to satisfy the following expression: BsSUL×tSUL>(1/C1)×Bsshield×tshield.

摘要翻译： 本发明的实施例有助于阻止垂直磁记录盘驱动器中的记录信息由于记录磁场泄漏到已经记录的信息而被衰减或擦除。 根据一个实施例，磁盘包括软磁性底层和磁记录层。 磁头包括主磁极，辅助磁极，后屏蔽，其经由主磁极的后侧上的非磁性膜设置，并且反向侧与辅助磁极接触， 以及设置在主磁极两侧的侧屏蔽。 这里，软磁性底层的饱和磁通密度为BsSUL，膜厚为tSUL的情况下， 后屏蔽和侧屏蔽的饱和磁通密度为Bsshield，其膜厚为tshield; 并且后屏蔽和侧屏蔽的与主磁极相对的侧面的数量为C1，条件被设置为满足以下表达式：<？in-line-formula description =“在线公式 “end =”lead“？> BsSxtxtSUL>（1 / C1）xBsshieldxtshield。<？in-line-formula description =”In-line Formulas“end =”tail“？>

公开(公告)号：US20090154012A1

公开(公告)日：2009-06-18

申请号：US12313410

申请日：2008-11-19

申请人： Masafumi Mochizuki ,  Hideaki Maeda ,  Shuji Nishida ,  Takaaki Izumida

发明人： Masafumi Mochizuki ,  Hideaki Maeda ,  Shuji Nishida ,  Takaaki Izumida

IPC分类号： G11B5/10

CPC分类号： G11B5/3116 ,  B82Y10/00 ,  B82Y25/00 ,  G11B5/1278 ,  G11B5/3909 ,  G11B5/3967 ,  G11B2005/3996

摘要： Embodiments of the invention reduce generation of a magnetic field with a polarity reverse to that of the recording magnetic field, without deteriorating a gradient in the magnetic field. An embodiment of a magnetic disk device according to the present invention suppresses deviation and erase of already recorded data. In an embodiment, the perpendicular magnetic recording head includes the main magnetic pole, an auxiliary magnetic pole, a trailing shield disposed on the trailing side of the main magnetic pole with a non-magnetic film placed in-between, and side shields disposed on both the sides of the main magnetic pole in the direction of the track width with a non-magnetic film placed in-between. The trailing shield has on the trailing side a portion where film thickness is thinner on the trailing side than the thickness of its element in the height direction in its position facing the main magnetic pole. Adoption of this configuration allows suppression of generation of the magnetic field having a polarity reverse to that of the recording magnetic field, without deteriorating the magnetic field gradient. Also in the portion where the side shields face the main magnetic pole, the side shields have the portion where the film is thinned down in thickness.

摘要翻译： 本发明的实施例减少了与记录磁场相反极性的磁场的产生，而不会使磁场中的梯度恶化。 根据本发明的磁盘装置的实施例抑制已经记录的数据的偏差和擦除。 在一个实施例中，垂直磁记录头包括主磁极，辅助磁极，设置在主磁极的后侧的后屏蔽件，其中放置有非磁性薄膜和设置在两者上的侧屏蔽 主磁极的侧面在磁道宽度方向上放置非磁性膜。 后挡板在其后侧具有在其后侧的膜厚度比其元件在其与主磁极相对的位置的高度方向上的厚度更薄的部分。 采用这种配置允许抑制具有与记录磁场相反的极性的磁场的产生，而不会降低磁场梯度。 另外在侧面屏蔽面对主磁极的部分，侧面屏蔽部分的薄膜部分厚度变薄。