公开(公告)号：US5847899A

公开(公告)日：1998-12-08

申请号：US779339

申请日：1997-01-06

申请人： Kazumasa Fukuda ,  Masanori Sakai ,  Mikio Matsuzaki ,  Joichiro Ezaki

发明人： Kazumasa Fukuda ,  Masanori Sakai ,  Mikio Matsuzaki ,  Joichiro Ezaki

IPC分类号： G11B5/02 ,  G11B5/012 ,  G11B5/11 ,  G11B5/31 ,  G11B5/39 ,  G11B5/40 ,  G11B5/64 ,  G11B5/65 ,  G11B5/72 ,  G11B5/73 ,  G11B5/82 ,  G11B33/14

CPC分类号： G11B5/012 ,  G11B33/1493 ,  G11B5/11 ,  G11B5/40 ,  G11B5/64 ,  G11B5/72

摘要： A thin film magnetic head includes a slider and thin film magnetic transducers, the slider supporting the thin film magnetic transducers. At least one of these thin film magnetic transducers is a magnetoresistive read element. The surface resistivity .rho. of the magnetic film of the magnetic disk is within the range of .rho..gtoreq.0.03.OMEGA..multidot.cm. Electric leak from the thin film magnetic head to the magnetic disk and electric discharge between these two are prevented.

摘要翻译： 薄膜磁头包括滑块和薄膜磁换能器，滑块支撑薄膜磁换能器。 这些薄膜磁换能器中的至少一个是磁阻读取元件。 磁盘的磁性膜的表面电阻率rho在r = 0.03 OMEGA×cm的范围内。 从薄膜磁头到磁盘的电泄漏和这两者之间的放电被防止。

公开(公告)号：US4939604A

公开(公告)日：1990-07-03

申请号：US327699

申请日：1989-03-23

申请人： Kazumasa Fukuda ,  Masanori Sakai ,  Joichiro Ezaki ,  Mikio Matsuzaki

发明人： Kazumasa Fukuda ,  Masanori Sakai ,  Joichiro Ezaki ,  Mikio Matsuzaki

IPC分类号： G11B5/00 ,  G11B5/73 ,  G11B5/82

CPC分类号： G11B5/7315 ,  G11B5/00 ,  G11B5/82

摘要： A magnetic head comprises a slider which holds recording/writing elements at its medium opposing surface constituting a lifting force generating part and the surface area of the medium opposing surface is at most 2 mm.sup.2.A magnetic recording and reproducing apparatus has such magnetic head which is disposed on a magnetic disk having a magnetic recording layer formed on a rigid substrate while the disk is rotated at a high speed so that magnetic recording and reproducing are conducted between the magnetic head and the magnetic disk, wherein the surface roughness R.sub.max of the magnetic disk is at most 100 .ANG..

摘要翻译： 磁头包括在构成提升力产生部件的介质相对表面处保持记录/写入元件的滑块，并且介质相对表面的表面积至多为2mm 2。 磁记录和再现装置具有这样的磁头，该磁头设置在具有形成在刚性基板上的磁记录层的磁盘上，同时盘以高速旋转，从而在磁头和磁头之间进行磁记录和再现 磁盘，其中磁盘的表面粗糙度Rmax为至多100安培。

公开(公告)号：US4113528A

公开(公告)日：1978-09-12

申请号：US744115

申请日：1976-11-22

申请人： Yasumichi Tokuoka ,  Kazumasa Fukuda

发明人： Yasumichi Tokuoka ,  Kazumasa Fukuda

IPC分类号： B22F1/02 ,  G11B5/706 ,  H01F1/06 ,  H01F1/09

CPC分类号： G11B5/70621 ,  H01F1/061

摘要： Ferromagnetic metal or alloy particles are prepared by reducing ferromagnetic metal ions in the solution with a reducing agent under a magnetic field to obtain a slurry of ferromagnetic metal or alloy particles and adding an oxidizing agent to an aqueous slurry containing the ferromagnetic metal or alloy particles to prevent deterioration of magnetic characteristics.

公开(公告)号：US07916434B2

公开(公告)日：2011-03-29

申请号：US11387876

申请日：2006-03-24

申请人： Shunji Saruki ,  Kenji Inage ,  Tetsuya Kuwashima ,  Hiroshi Kiyono ,  Katsumichi Tagami ,  Kazumasa Fukuda ,  Masahide Kohno

发明人： Shunji Saruki ,  Kenji Inage ,  Tetsuya Kuwashima ,  Hiroshi Kiyono ,  Katsumichi Tagami ,  Kazumasa Fukuda ,  Masahide Kohno

IPC分类号： G11B5/33

CPC分类号： G11B5/455 ,  B82Y10/00 ,  B82Y25/00 ,  B82Y40/00 ,  G11B5/3903 ,  G11B5/3909 ,  H01F10/3254 ,  H01F41/303 ,  H01L43/08 ,  H01L43/12

摘要： A TMR effect element with sufficiently reduced element resistance and restricted popping noise is provided, which comprises a tunnel barrier layer formed primarily of a metal oxide including many electric charge sites. The electric charge sites density n and the mobility μ of electrons trapped due to the electric charge sites satisfy a relationship expressed by: 0

摘要翻译： 提供具有充分降低的元件电阻和限制弹出噪声的TMR效应元件，其包括主要由包括许多电荷位点的金属氧化物形成的隧道势垒层。 电荷位置密度n和由于电荷位点捕获的电子的迁移率μ满足由下式表示的关系：0 <（ns1-1-ns2-1）-1·（μ0-μ）·（nμ）-1 <0.2，其中ns1和ns2是在读取信号期间元件电阻分别为最小值和最大值时隧道电子的密度，μ0是未被捕获时电子的迁移率。

公开(公告)号：US07120990B2

公开(公告)日：2006-10-17

申请号：US10949354

申请日：2004-09-27

申请人： Yoshitaka Sasaki ,  Atsushi Iijima ,  Kazumasa Fukuda

发明人： Yoshitaka Sasaki ,  Atsushi Iijima ,  Kazumasa Fukuda

IPC分类号： G11B5/127 ,  G11B5/187

CPC分类号： G11B5/3967 ,  G11B5/3116 ,  G11B5/313 ,  G11B5/3163 ,  Y10T29/49021 ,  Y10T29/49032 ,  Y10T29/49034 ,  Y10T29/49044 ,  Y10T29/49046 ,  Y10T29/4906

摘要： A method of manufacturing a thin film magnetic head. The method includes forming, near a pole portion: a first magnetic layer supported by a base substrate; a first insulating layer on the first magnetic layer with an end edge which forms a reference position for an air bearing surface; a gap layer on the pole portion of the first magnetic layer and the first insulation layer; a second magnetic layer that extends to a region beyond the pole portion; a thin film coil isolated by a second insulation layer located above the first insulation layer; a third magnetic layer on the second insulation layer. The air bearing surface is formed by grinding in part an end face of the pole portion of the first magnetic layer and an end face of the pole portion of the second magnetic layer and the gap layer placed therebetween.

摘要翻译： 一种制造薄膜磁头的方法。 该方法包括在极部附近形成由基底基板支撑的第一磁性层; 在第一磁性层上的第一绝缘层，其端边缘形成空气轴承表面的基准位置; 第一磁性层的极部和第一绝缘层的间隙层; 第二磁性层，延伸到超过极部分的区域; 由位于第一绝缘层上方的第二绝缘层隔离的薄膜线圈; 在第二绝缘层上的第三磁性层。 空气轴承表面通过部分地研磨第一磁性层的极部的端面和第二磁性层的极部的端面以及间隔层而形成。

公开(公告)号：US07061718B2

公开(公告)日：2006-06-13

申请号：US10613073

申请日：2003-07-07

申请人： Yoshitaka Sasaki ,  Atsushi Iijima ,  Kazumasa Fukuda

发明人： Yoshitaka Sasaki ,  Atsushi Iijima ,  Kazumasa Fukuda

IPC分类号： G11B5/147

CPC分类号： G11B5/3967 ,  G11B5/3116 ,  G11B5/313 ,  Y10T29/49032 ,  Y10T29/49044 ,  Y10T29/49046 ,  Y10T29/4906

摘要： On a first magnetic layer 27, is formed a ring-shaped insulating layer 28 whose air bearing surface side edge defines a reference position for a throat height, and after forming a write gap layer 29, a second magnetic layer 30 is formed such that the second magnetic layer extends over the ring-shaped insulating layer 28. The write gap layer is selectively removed by performing an etching process using the second magnetic layer as a mask, and then the first magnetic layer is partially removed over a part of its thickness to form a trim structure. After forming a thin film coil 33, 35 within the ring-shaped insulating layer, a third magnetic layer is formed to be brought into contact with a rear portion of the second magnetic layer 31. The third magnetic layer may be contacted with a surface, a surface and side walls or a surface, side walls and an end surface of rear portion of the second magnetic layer. In the thin film magnetic head, a pole chip defining a track width is narrow, magnetic flux saturation and leakage of magnetic flux can be suppressed in spite of a short throat height, and a high recording efficiency can be attained. The invention provides a method of manufacturing easily the thin film magnetic head having such superior performance with a high yield.

摘要翻译： 在第一磁性层27上形成环形绝缘层28，其环形绝缘层28的空气轴承表面侧边缘限定了喉部高度的基准位置，并且在形成写入间隙层29之后，形成第二磁性层30， 第二磁性层在环形绝缘层28上延伸。通过使用第二磁性层作为掩模进行蚀刻工艺来选择性地去除写入间隙层，然后将第一磁性层的一部分厚度部分地去除， 形成一个装饰结构。 在环状绝缘层内形成薄膜线圈33,35之后，形成与第二磁性层31的后部接触的第三磁性层。第三磁性层可以与表面接触， 表面和侧壁或表面，侧壁和第二磁性层后部的端面。 在薄膜磁头中，限定磁道宽度的磁极芯片窄，尽管具有短的喉部高度，也可以抑制磁通饱和度和磁通量的泄漏，并且可以获得高的记录效率。 本发明提供一种以高产率容易地制造具有这种优异性能的薄膜磁头的方法。

公开(公告)号：US20050044693A1

公开(公告)日：2005-03-03

申请号：US10949354

申请日：2004-09-27

申请人： Yoshitaka Sasaki ,  Atsushi Iijima ,  Kazumasa Fukuda

发明人： Yoshitaka Sasaki ,  Atsushi Iijima ,  Kazumasa Fukuda

IPC分类号： G11B5/31 ,  G11B5/39 ,  G11B5/187

CPC分类号： G11B5/3967 ,  G11B5/3116 ,  G11B5/313 ,  G11B5/3163 ,  Y10T29/49021 ,  Y10T29/49032 ,  Y10T29/49034 ,  Y10T29/49044 ,  Y10T29/49046 ,  Y10T29/4906

摘要： A method of manufacturing a thin film magnetic head. The method includes forming, near a pole portion: a first magnetic layer supported by a base substrate; a first insulating layer on the first magnetic layer with an end edge which forms a reference position for an air bearing surface; a gap layer on the pole portion of the first magnetic layer and the first insulation layer; a second magnetic layer that extends to a region beyond the pole portion; a thin film coil isolated by a second insulation layer located above the first insulation layer; a third magnetic layer on the second insulation layer. The air bearing surface is formed by grinding in part an end face of the pole portion of the first magnetic layer and an end face of the pole portion of the second magnetic layer and the gap layer placed therebetween.

摘要翻译： 一种制造薄膜磁头的方法。 该方法包括在极部附近形成由基底基板支撑的第一磁性层; 在第一磁性层上的第一绝缘层，其端边缘形成空气轴承表面的基准位置; 第一磁性层的极部和第一绝缘层的间隙层; 第二磁性层，延伸到超过极部分的区域; 由位于第一绝缘层上方的第二绝缘层隔离的薄膜线圈; 在第二绝缘层上的第三磁性层。 空气轴承表面通过部分地研磨第一磁性层的极部的端面和第二磁性层的极部的端面以及间隔层而形成。

公开(公告)号：US6163436A

公开(公告)日：2000-12-19

申请号：US103394

申请日：1998-06-24

申请人： Yoshitaka Sasaki ,  Atsushi Iijima ,  Kazumasa Fukuda

发明人： Yoshitaka Sasaki ,  Atsushi Iijima ,  Kazumasa Fukuda

IPC分类号： G11B5/31 ,  G11B5/39 ,  G11B5/147

CPC分类号： G11B5/3967 ,  G11B5/3116 ,  G11B5/313 ,  G11B5/3163

摘要： After forming the first shield layer 23 on a basic substrate 21 and 22, a GMR film 25 is formed and embedded in the shield gap layers 24 and 26, in addition, a first insulation layer 28' where the edge defines a reference position of a throat height zero is formed on a first magnetic layer 27, a gap layer 28 is formed on a magnetic pole portion of the first magnetic layer 27 and the first insulation layer, then a second magnetic layer 29 extended above the first insulation layer 38' from the upper side of the magnetic pole portion of the first magnetic layer 27 is formed, after smoothing its surface by the second insulation layer 31, thin film coils 32 and 34 are formed on this second insulation layer, and the third magnetic layer 36 is formed on the insulation layers 33 and 35 where the magnetic pole portion and the thin film coil of the second above magnetic layer are isolated. In order to cancel the saturation of the magnetic flux in a magnetic pole portion effectively , and to prevent the widening of width the effective track and a decrease in the yield, the third above magnetic layer is made retreated from the air bearing surface, and is connected to rear a region from the magnetic pole portion of the second magnetic layer. A rear region of the magnetic pole portion of the second magnetic layer 29 is made in the shape of fan and connected to the third magnetic layer 36 over enough area so that the magnetic flux might not be saturated even when the tip portion of the upper pole is retreated from the air bearing surface.

摘要翻译： 在基本基板21,22上形成第一屏蔽层23之后，形成GMR膜25并嵌入屏蔽间隙层24和26中，此外，第一绝缘层28'的边缘限定了基板的基准位置 在第一磁性层27上形成喉部高度零点，在第一磁性层27和第一绝缘层的磁极部上形成间隙层28，然后在第一绝缘层38'的上方延伸第二磁性层29 形成第一磁性层27的磁极部的上侧，在通过第二绝缘层31使其表面平滑化之后，在该第二绝缘层上形成有薄膜线圈32,34，形成第三磁性层36 在第二上述磁性层的磁极部分和薄膜线圈被隔离的绝缘层33和35上。 为了有效地消除磁极部分的磁通量的饱和，并且为了防止有效轨迹的宽度扩大和产量的降低，第三上述磁性层从空气轴承表面退避，并且是 连接到从第二磁性层的磁极部分的区域的后面。 第二磁性层29的磁极部的后部区域形成为风扇的形状，并且在第三磁性层36的足够的面积上连接，使得即使当上部极的顶端部分的磁通量也不会饱和 从空气轴承表面退回。

公开(公告)号：US6130805A

公开(公告)日：2000-10-10

申请号：US99461

申请日：1998-06-18

申请人： Yoshitaka Sasaki ,  Atsushi Iijima ,  Kazumasa Fukuda

发明人： Yoshitaka Sasaki ,  Atsushi Iijima ,  Kazumasa Fukuda

IPC分类号： G11B5/31 ,  G11B5/39 ,  G11B5/147

CPC分类号： G11B5/3967 ,  G11B5/3116 ,  G11B5/313 ,  Y10T29/49032 ,  Y10T29/49044 ,  Y10T29/49046 ,  Y10T29/4906

摘要： On a first magnetic layer 27, is formed a ring-shaped insulating layer 28 whose air bearing surface side edge defines a reference position for a throat height, and after forming a write gap layer 29, a second magnetic layer 30 is formed such that the second magnetic layer extends over the ring-shaped insulating layer 28. The write gap layer is selectively removed by performing an etching process using the second magnetic layer as a mask, and then the first magnetic layer is partially removed over a part of its thickness to form a trim structure. After forming a thin film coil 33, 35 within the ring-shaped insulating layer, a third magnetic layer is formed to be brought into contact with a rear portion of the second magnetic layer 31. The third magnetic layer may be contacted with a surface, a surface and side walls or a surface, side walls and an end surface of rear portion of the second magnetic layer. In the thin film magnetic head, a pole chip defining a track width is narrow, magnetic flux saturation and leakage of magnetic flux can be suppressed in spite of a short throat height, and a high recording efficiency can be attained. The invention provides a method of manufacturing easily the thin film magnetic head having such superior performance with a high yield.

摘要翻译： 在第一磁性层27上形成环形绝缘层28，其环形绝缘层28的空气轴承表面侧边缘限定了喉部高度的基准位置，并且在形成写入间隙层29之后，形成第二磁性层30， 第二磁性层在环形绝缘层28上延伸。通过使用第二磁性层作为掩模进行蚀刻工艺来选择性地去除写入间隙层，然后将第一磁性层的一部分厚度部分地去除， 形成一个装饰结构。 在环状绝缘层内形成薄膜线圈33,35之后，形成与第二磁性层31的后部接触的第三磁性层。第三磁性层可以与表面接触， 表面和侧壁或表面，侧壁和第二磁性层后部的端面。 在薄膜磁头中，限定磁道宽度的磁极芯片窄，尽管具有短的喉部高度，也可以抑制磁通饱和度和磁通量的泄漏，并且可以获得高的记录效率。 本发明提供一种以高产率容易地制造具有这种优异性能的薄膜磁头的方法。

公开(公告)号：US5072320A

公开(公告)日：1991-12-10

申请号：US316318

申请日：1989-02-27

申请人： Joichiro Ezaki ,  Kazumasa Fukuda ,  Masanori Sakai

发明人： Joichiro Ezaki ,  Kazumasa Fukuda ,  Masanori Sakai

IPC分类号： G11B5/012 ,  G11B5/72 ,  G11B5/73 ,  G11B5/82

CPC分类号： G11B5/7315 ,  G11B5/012 ,  G11B5/72 ,  G11B5/82

摘要： In a magnetic recording and reproducing apparatus of a type wherein a magnetic disk having a magnetic recording layer formed on a rigid substrate is rotated at a high speed and magnetic recording and reproduction are conducted by the magnetic head disposed on the surface of the disk, the magnetic recording and reproducing apparatus being characterized in that the magnetic recording layer constitutes an oxide layer, a nitride layer or an oxidized coating film at at least its surface layer, and the magnetic recording and reproducing are conducted by the magnetic head which is caused to be substantially in contact with the surface of magnetic disk at at least the innermost cylinder of the magnetic disk.

摘要翻译： 在其中具有形成在刚性基板上的磁记录层的磁盘以高速旋转并且通过设置在盘表面上的磁头进行磁记录和再现的类型的磁记录和再现装置中， 磁记录和再现装置的特征在于，磁记录层至少在其表面层上形成氧化物层，氮化物层或氧化涂膜，磁记录和再现由磁头进行 在磁盘的至少最内圆筒处基本上与磁盘表面接触。