公开(公告)号：US07274541B2

公开(公告)日：2007-09-25

申请号：US11095533

申请日：2005-04-01

申请人： Gen Oikawa ,  Shuichi Kojima ,  Harunobu Saito ,  Noriyuki Saiki ,  Masayasu Kagawa ,  Akira Kondo ,  Kenji Ishikake ,  Hiromi Shiina

发明人： Gen Oikawa ,  Shuichi Kojima ,  Harunobu Saito ,  Noriyuki Saiki ,  Masayasu Kagawa ,  Akira Kondo ,  Kenji Ishikake ,  Hiromi Shiina

IPC分类号： G11B5/147 ,  G11B5/39

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/3103 ,  G11B5/3113 ,  G11B5/3163 ,  G11B5/3967 ,  G11B2005/3996 ,  Y10T29/49032 ,  Y10T29/49044

摘要： In formation of an upper shield of a magnetic thin film head by electroplating, a current density of electroplating is regulated stepwise with time. Thus, in the upper shield formation, a film composition and magnetic characteristic with respect to the direction of film thickness can be controlled precisely, making it possible to provide a magnetic thin film head featuring significantly reduced noise-after-write and output fluctuation.

摘要翻译： 在通过电镀形成磁性薄膜头的上屏蔽时，电流的电流密度随时间逐步调节。 因此，在上屏蔽形成中，可以精确地控制膜组成和相对于膜厚度方向的磁特性，使得可以提供具有显着降低的写入后和输出波动的磁性薄膜头。

公开(公告)号：US20050168876A1

公开(公告)日：2005-08-04

申请号：US11095533

申请日：2005-04-01

申请人： Gen Oikawa ,  Shuichi Kojima ,  Harunobu Saito ,  Noriyuki Saiki ,  Masayasu Kagawa ,  Akira Kondo ,  Kenji Ishikake ,  Hiromi Shiina

发明人： Gen Oikawa ,  Shuichi Kojima ,  Harunobu Saito ,  Noriyuki Saiki ,  Masayasu Kagawa ,  Akira Kondo ,  Kenji Ishikake ,  Hiromi Shiina

IPC分类号： G11B5/31 ,  G11B5/39 ,  H01F10/14 ,  G11B5/33 ,  G11B5/127

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/3103 ,  G11B5/3113 ,  G11B5/3163 ,  G11B5/3967 ,  G11B2005/3996 ,  Y10T29/49032 ,  Y10T29/49044

摘要： In formation of an upper shield of a magnetic thin film head by electroplating, a current density of electroplating is regulated stepwise with time. Thus, in the upper shield formation, a film composition and magnetic characteristic with respect to the direction of film thickness can be controlled precisely, making it possible to provide a magnetic thin film head featuring significantly reduced noise-after-write and output fluctuation.

摘要翻译： 在通过电镀形成磁性薄膜头的上屏蔽时，电流的电流密度随时间逐步调节。 因此，在上屏蔽形成中，可以精确地控制膜组成和相对于膜厚度方向的磁特性，使得可以提供具有显着降低的写入后和输出波动的磁性薄膜头。

公开(公告)号：US07995311B2

公开(公告)日：2011-08-09

申请号：US11820554

申请日：2007-06-19

申请人： Kazue Kudo ,  Gen Oikawa ,  Yohji Maruyama ,  Noriyuki Saiki ,  Hiromi Shiina

发明人： Kazue Kudo ,  Gen Oikawa ,  Yohji Maruyama ,  Noriyuki Saiki ,  Hiromi Shiina

IPC分类号： G11B5/147

CPC分类号： G11B5/3116 ,  G11B5/1278 ,  G11B5/3912 ,  G11B5/3967

摘要： Embodiments of the present invention provide a magnetic shield composed of size-controlled small crystal grains and provide a more after-write read noise free thin film magnetic head. According to one embodiment of the present invention, an upper magnetic shield uses a multi-layered magnetic film formed by alternately stacking a face-centered cubic (fcc) crystalline magnetic thin layer and a body-centered cubic (bcc) crystalline magnetic thin layer by plating. The plating bath is such that the temperature is 30±1° C., pH is about 2.0−1.0 to 2.0+0.5, metal ion concentrations are about 5 to 25 (g/l) for Ni2+ and 5 to 15 (g/l) for Fe2+, saccharin sodium concentration is about 1.5±1.0 (g/l), sodium chloride concentration is about 25±5 (g/l), and boric acid concentration is about 25±5 (g/l). Each layer's crystal structure is different from that of its upper and lower layers, which results in size-controlled small crystal grains since the epitaxial growth is broken. Since crystal grains are reduced in size, it is possible to suppress the after-write read noise and therefore attain a read head which allows recording at higher frequencies.

摘要翻译： 本发明的实施例提供一种由尺寸控制的小晶粒组成的磁屏蔽，并提供更多的后写入无噪声薄膜磁头。 根据本发明的一个实施例，上磁屏蔽使用通过交替层叠面心立方（fcc）结晶磁性薄膜和体心立方（bcc）结晶磁性薄膜而形成的多层磁性膜， 电镀。 电镀浴温度为30±1℃，pH为约2.0-1.0〜2.0 + 0.5，Ni2 +和5〜15（g / l）的金属离子浓度约为5〜25（g / l） ）对于Fe2 +，糖精钠浓度约为1.5±1.0（g / l），氯化钠浓度约为25±5（g / l），硼酸浓度约为25±5（g / l）。 每层的晶体结构与其上层和下层的晶体结构不同，这导致尺寸控制的小晶粒，因为外延生长破裂。 由于晶粒尺寸减小，因此可以抑制写入后的读取噪声，从而获得允许以较高频率记录的读取头。

公开(公告)号：US07589937B2

公开(公告)日：2009-09-15

申请号：US10894723

申请日：2004-07-19

申请人： Gen Oikawa ,  Kazue Kudo ,  Youji Maruyama ,  Noriyuki Saiki ,  Hiromi Shiina

发明人： Gen Oikawa ,  Kazue Kudo ,  Youji Maruyama ,  Noriyuki Saiki ,  Hiromi Shiina

IPC分类号： G11B5/127

CPC分类号： G11B5/3116 ,  G11B5/147 ,  Y10T29/49032

摘要： Embodiments of the invention provide a lustrous and uniform plating film having high-performance magnetic characteristics and a thin film magnetic head usable in a high frequency recording band by using the plating film of the invention at a magnetic pole portion. Plating is performed in a plating bath at a low pH of about 1.5 to 2.3. The accuracy of pH control is improved. A magnetic film with the addition of a high resistive metal such as Cr or Mo is formed under the plating condition. Further, the magnetic characteristic is improved by applying a heat treatment to the plating film in a magnetic field, according to specific embodiments of the present invention. A plating film with brightness and uniformity having high saturation magnetic flux density can be formed by reducing the hysteresis loss and the eddy current loss as the magnetic characteristics by the above techniques.

摘要翻译： 本发明的实施例通过使用本发明的镀膜在磁极部分提供具有高性能磁特性的光泽均匀的镀膜和可用于高频记录带的薄膜磁头。 电镀在约1.5至2.3的低pH值的电镀浴中进行。 pH控制的准确性得到提高。 在电镀条件下形成具有添加诸如Cr或Mo的高电阻金属的磁性膜。 此外，根据本发明的具体实施方式，通过在磁场中对镀膜进行热处理来提高磁特性。 通过上述技术，可以通过减小作为磁特性的磁滞损耗和涡流损耗来形成具有高饱和磁通密度的亮度和均匀性的电镀膜。

公开(公告)号：US08064161B2

公开(公告)日：2011-11-22

申请号：US12231246

申请日：2008-08-28

申请人： Kazue Kudo ,  Hiromi Shiina ,  Gen Oikawa ,  Yohji Maruyama ,  Noriyuki Saiki

发明人： Kazue Kudo ,  Hiromi Shiina ,  Gen Oikawa ,  Yohji Maruyama ,  Noriyuki Saiki

IPC分类号： H04R31/00 ,  G11B5/147

CPC分类号： G11B5/3146 ,  G11B5/1278 ,  G11B5/315 ,  G11B5/3163 ,  Y10T29/49044 ,  Y10T29/4906

摘要： Embodiments of the present invention help to provide a perpendicular magnetic recording head capable of writing a signal in a track having a small width. According to one embodiment, a perpendicular magnetic recording head includes an auxiliary pole, a main pole, a yoke, a coil, a first soft magnetic film and a second soft magnetic film. The yoke is in contact with the main pole. The coil is wound around a magnetic circuit composed of the auxiliary and main poles and the yoke. The first soft magnetic film is provided on both sides of the main pole with a non-magnetic film provided between the first soft magnetic film and the main pole. The second soft magnetic film is provided on the trailing side of the main pole with the non-magnetic film provided between the second soft magnetic film and the main pole. The first and second soft magnetic films are two types of plated magnetic films. One type of the plated magnetic films have respective thicknesses of 0.5 nm to 20 nm and respective body centered cubic lattice crystal structures. The other types of the plated magnetic films have respective thicknesses of 0.5 nm to 20 nm and respective face centered cubic lattice crystal structures. The two types of the plated magnetic films are alternately laminated with four or more layers. This can achieve the magnetic disk drive capable of reducing a possibility to erroneously delete a signal after the signal being written and preventing degradation of characteristics of a high frequency signal.

摘要翻译： 本发明的实施例有助于提供一种能够在具有小宽度的轨迹中写入信号的垂直磁记录头。 根据一个实施例，垂直磁记录头包括辅助极，主极，磁轭，线圈，第一软磁膜和第二软磁膜。 轭与主极接触。 线圈缠绕在由辅助和主极和轭构成的磁路上。 第一软磁膜设置在主极的两侧，设置在第一软磁膜和主极之间的非磁性膜。 第二软磁膜设置在主极的后侧，设置在第二软磁膜和主极之间的非磁性膜。 第一和第二软磁膜是两种类型的镀覆磁性膜。 一种类型的电镀磁性膜具有0.5nm至20nm的各自的厚度和相应的体心立方晶格结构。 其他类型的镀膜磁性膜具有0.5nm至20nm的各自的厚度和各自的面心立方晶格结构。 两种类型的镀覆磁性膜交替地层压有四层或更多层。 这可以实现能够降低信号被写入之后错误地删除信号的可能性的磁盘驱动器，并且防止高频信号的特性的劣化。

公开(公告)号：US20090059427A1

公开(公告)日：2009-03-05

申请号：US12231246

申请日：2008-08-28

申请人： Kazue Kudo ,  Hiromi Shiina ,  Gen Oikawa ,  Yoji Maruyama ,  Noriyuki Saiki

发明人： Kazue Kudo ,  Hiromi Shiina ,  Gen Oikawa ,  Yoji Maruyama ,  Noriyuki Saiki

IPC分类号： G11B5/127

CPC分类号： G11B5/3146 ,  G11B5/1278 ,  G11B5/315 ,  G11B5/3163 ,  Y10T29/49044 ,  Y10T29/4906

摘要： Embodiments of the present invention help to provide a perpendicular magnetic recording head capable of writing a signal in a track having a small width. According to one embodiment, a perpendicular magnetic recording head includes an auxiliary pole, a main pole, a yoke, a coil, a first soft magnetic film and a second soft magnetic film. The yoke is in contact with the main pole. The coil is wound around a magnetic circuit composed of the auxiliary and main poles and the yoke. The first soft magnetic film is provided on both sides of the main pole with a non-magnetic film provided between the first soft magnetic film and the main pole. The second soft magnetic film is provided on the trailing side of the main pole with the non-magnetic film provided between the second soft magnetic film and the main pole. The first and second soft magnetic films are two types of plated magnetic films. One type of the plated magnetic films have respective thicknesses of 0.5 nm to 20 nm and respective body centered cubic lattice crystal structures. The other types of the plated magnetic films have respective thicknesses of 0.5 nm to 20 nm and respective face centered cubic lattice crystal structures. The two types of the plated magnetic films are alternately laminated with four or more layers. This can achieve the magnetic disk drive capable of reducing a possibility to erroneously delete a signal after the signal being written and preventing degradation of characteristics of a high frequency signal.

摘要翻译： 本发明的实施例有助于提供一种能够在具有小宽度的轨迹中写入信号的垂直磁记录头。 根据一个实施例，垂直磁记录头包括辅助极，主极，磁轭，线圈，第一软磁膜和第二软磁膜。 轭与主极接触。 线圈缠绕在由辅助和主极和轭构成的磁路上。 第一软磁膜设置在主极的两侧，设置在第一软磁膜和主极之间的非磁性膜。 第二软磁膜设置在主极的后侧，设置在第二软磁膜和主极之间的非磁性膜。 第一和第二软磁膜是两种类型的镀覆磁性膜。 一种类型的电镀磁性膜具有0.5nm至20nm的各自的厚度和相应的体心立方晶格结构。 其他类型的镀膜磁性膜具有0.5nm至20nm的各自的厚度和各自的面心立方晶格结构。 两种类型的镀覆磁性膜交替地层压有四层或更多层。 这可以实现能够降低信号被写入之后错误地删除信号的可能性的磁盘驱动器，并且防止高频信号的特性的劣化。

公开(公告)号：US20080075977A1

公开(公告)日：2008-03-27

申请号：US11820598

申请日：2007-06-19

申请人： Kazue Kudo ,  Gen Oikawa ,  Yohji Maruyama ,  Noriyuki Saiki ,  Hiromi Shiina

发明人： Kazue Kudo ,  Gen Oikawa ,  Yohji Maruyama ,  Noriyuki Saiki ,  Hiromi Shiina

IPC分类号： G11B5/33 ,  H04R31/00

CPC分类号： G11B5/3116 ,  G11B5/1278 ,  G11B5/147 ,  G11B5/313 ,  Y10T29/49032 ,  Y10T428/115

摘要： Embodiments of the present invention provide a magnetic disk drive capable of allowing higher data transfer rates and higher recording densities. According to one embodiment, an upper magnetic core and lower magnetic core comprise a multi-layered magnetic film formed by alternately stacking a face-centered cubic (fcc) crystalline magnetic thin layer and a body-centered cubic (bcc) crystalline magnetic thin layer by plating. The plating bath is such that the temperature is about 30±1° C., pH is about 2.0−1.0 to 2.0+0.5, metal ion concentrations are about 5 to 25 (g/l) for Ni2+ and 5 to 15 (g/l) for Fe2+, saccharin sodium concentration is about 1.5±1.0 (g/l), sodium chloride concentration is about 25±5 (g/l), and boric acid concentration is about 25±5 (g/l). Since each layer's crystal structure is different from that of its adjacent lower layer, epitaxial growth is broken within each layer. Thus, since crystal grains are reduced in size, it is possible to lessen the decrease of the permeability μ at higher frequencies.

摘要翻译： 本发明的实施例提供一种能够允许更高数据传输速率和更高记录密度的磁盘驱动器。 根据一个实施例，上磁芯和下磁芯包括通过交替地将面心立方（fcc）晶体磁性薄层和体心立方（bcc）结晶磁性薄层交替堆叠而形成的多层磁性膜， 电镀。 电镀浴温度为约30±1℃，pH为约2.0-1.0至2.0 + 0.5，Ni2 +和5至15（g / l）的金属离子浓度为约5至25（g / l） l）对于Fe2 +，糖精钠浓度约为1.5±1.0（g / l），氯化钠浓度约为25±5（g / l），硼酸浓度约为25±5（g / l）。 由于每个层的晶体结构与其相邻的下层的晶体结构不同，所以在每个层内外延生长被破坏。 因此，由于晶粒尺寸减小，因此能够降低高频率下的磁导率μμ的降低。

公开(公告)号：US20050036236A1

公开(公告)日：2005-02-17

申请号：US10894723

申请日：2004-07-19

申请人： Gen Oikawa ,  Kazue Kudo ,  Youji Maruyama ,  Noriyuki Saiki ,  Hiromi Shiina

发明人： Gen Oikawa ,  Kazue Kudo ,  Youji Maruyama ,  Noriyuki Saiki ,  Hiromi Shiina

IPC分类号： G11B5/147 ,  G11B5/31

CPC分类号： G11B5/3116 ,  G11B5/147 ,  Y10T29/49032

摘要： Embodiments of the invention provide a lustrous and uniform plating film having high-performance magnetic characteristics and a thin film magnetic head usable in a high frequency recording band by using the plating film of the invention at a magnetic pole portion. Plating is performed in a plating bath at a low pH of about 1.5 to 2.3. The accuracy of pH control is improved. A magnetic film with the addition of a high resistive metal such as Cr or Mo is formed under the plating condition. Further, the magnetic characteristic is improved by applying a heat treatment to the plating film in a magnetic field, according to specific embodiments of the present invention. A plating film with brightness and uniformity having high saturation magnetic flux density can be formed by reducing the hysteresis loss and the eddy current loss as the magnetic characteristics by the above techniques.

摘要翻译： 本发明的实施例通过使用本发明的镀膜在磁极部分提供具有高性能磁特性的光泽均匀的镀膜和可用于高频记录带的薄膜磁头。 电镀在约1.5至2.3的低pH值的电镀浴中进行。 pH控制的准确性得到提高。 在电镀条件下形成具有添加诸如Cr或Mo的高电阻金属的磁性膜。 此外，根据本发明的具体实施方式，通过在磁场中对镀膜进行热处理来提高磁特性。 通过上述技术，可以通过减小作为磁特性的磁滞损耗和涡流损耗来形成具有高饱和磁通密度的亮度和均匀性的电镀膜。

公开(公告)号：US07842408B2

公开(公告)日：2010-11-30

申请号：US11820598

申请日：2007-06-19

申请人： Kazue Kudo ,  Gen Oikawa ,  Yohji Maruyama ,  Noriyuki Saiki ,  Hiromi Shiina

发明人： Kazue Kudo ,  Gen Oikawa ,  Yohji Maruyama ,  Noriyuki Saiki ,  Hiromi Shiina

IPC分类号： G11B5/33 ,  H04R31/00

CPC分类号： G11B5/3116 ,  G11B5/1278 ,  G11B5/147 ,  G11B5/313 ,  Y10T29/49032 ,  Y10T428/115

摘要： Embodiments of the present invention provide a magnetic disk drive capable of allowing higher data transfer rates and higher recording densities. According to one embodiment, an upper magnetic core and lower magnetic core comprise a multi-layered magnetic film formed by alternately stacking a face-centered cubic (fcc) crystalline magnetic thin layer and a body-centered cubic (bcc) crystalline magnetic thin layer by plating. The plating bath is such that the temperature is about 30±1° C., pH is about 2.0−1.0 to 2.0+0.5, metal ion concentrations are about 5 to 25 (g/l) for Ni2+ and 5 to 15 (g/l) for Fe2+, saccharin sodium concentration is about 1.5±1.0 (g/l), sodium chloride concentration is about 25±5 (g/l), and boric acid concentration is about 25±5 (g/l). Since each layer's crystal structure is different from that of its adjacent lower layer, epitaxial growth is broken within each layer. Thus, since crystal grains are reduced in size, it is possible to lessen the decrease of the permeability μ at higher frequencies.

摘要翻译： 本发明的实施例提供一种能够允许更高数据传输速率和更高记录密度的磁盘驱动器。 根据一个实施例，上磁芯和下磁芯包括通过交替地将面心立方（fcc）晶体磁性薄层和体心立方（bcc）结晶磁性薄层交替堆叠而形成的多层磁性膜， 电镀。 电镀浴温度为约30±1℃，pH为约2.0-1.0至2.0 + 0.5，Ni2 +和5至15（g / l）的金属离子浓度为约5至25（g / l） l）对于Fe2 +，糖精钠浓度约为1.5±1.0（g / l），氯化钠浓度约为25±5（g / l），硼酸浓度约为25±5（g / l）。 由于每个层的晶体结构与其相邻的下层的晶体结构不同，所以在每个层内外延生长被破坏。 因此，由于晶粒尺寸减小，因此可以降低较高频率下的磁导率μ的降低。

公开(公告)号：US20080002308A1

公开(公告)日：2008-01-03

申请号：US11820554

申请日：2007-06-19

申请人： Kazue Kudo ,  Gen Oikawa ,  Yohji Maruyama ,  Noriyuki Saiki ,  Hiromi Shiina

发明人： Kazue Kudo ,  Gen Oikawa ,  Yohji Maruyama ,  Noriyuki Saiki ,  Hiromi Shiina

IPC分类号： G11B5/127

CPC分类号： G11B5/3116 ,  G11B5/1278 ,  G11B5/3912 ,  G11B5/3967

摘要： Embodiments of the present invention provide a magnetic shield composed of size-controlled small crystal grains and provide a more after-write read noise free thin film magnetic head. According to one embodiment of the present invention, an upper magnetic shield uses a multi-layered magnetic film formed by alternately stacking a face-centered cubic (fcc) crystalline magnetic thin layer and a body-centered cubic (bcc) crystalline magnetic thin layer by plating. The plating bath is such that the temperature is 30±1° C., pH is about 2.0-1.0 to 2.0+0.5, metal ion concentrations are about 5 to 25 (g/l) for Ni2+ and 5 to 15 (g/l) for Fe2+, saccharin sodium concentration is about 1.5±1.0 (g/l), sodium chloride concentration is about 25±5 (g/l), and boric acid concentration is about 25±5 (g/l). Each layer's crystal structure is different from that of its upper and lower layers, which results in size-controlled small crystal grains since the epitaxial growth is broken. Since crystal grains are reduced in size, it is possible to suppress the after-write read noise and therefore attain a read head which allows recording at higher frequencies.

摘要翻译： 本发明的实施例提供一种由尺寸控制的小晶粒组成的磁屏蔽，并提供更多的后写入无噪声薄膜磁头。 根据本发明的一个实施例，上磁屏蔽使用通过交替层叠面心立方（fcc）结晶磁性薄膜和体心立方（bcc）结晶磁性薄膜而形成的多层磁性膜， 电镀。 电镀浴温度为30±1℃，pH为约2.0-1.0〜2.0±0.5，Ni 2+ / SUP的金属离子浓度约为5〜25（g / l） > 5〜15（g / l），糖精钠浓度约为1.5±1.0（g / l），氯化钠浓度约为25±5（g / l） 硼酸浓度约为25±5（g / l）。 每层的晶体结构与其上层和下层的晶体结构不同，这导致尺寸控制的小晶粒，因为外延生长破裂。 由于晶粒尺寸减小，因此可以抑制写入后的读取噪声，从而获得允许以较高频率记录的读取头。