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。

公开(公告)号：US4642270A

公开(公告)日：1987-02-10

申请号：US675302

申请日：1984-11-27

申请人： Haruyuki Morita ,  Jiro Yoshinari ,  Kazumasa Fukuda

发明人： Haruyuki Morita ,  Jiro Yoshinari ,  Kazumasa Fukuda

IPC分类号： G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/667 ,  G11B5/738 ,  G11B5/84 ,  H01F10/00

CPC分类号： G11B5/66 ,  Y10T428/12535 ,  Y10T428/12569 ,  Y10T428/12646 ,  Y10T428/12847 ,  Y10T428/12854 ,  Y10T428/12937

摘要： In a magnetic recording medium comprising a non-magnetic substrate and a magnetic thin film formed on the surface thereof and including at least two layers, the upper layer in the form of a crystalline cobalt-chromium alloy layer suitable for perpendicular magnetization is placed on the lower layer in the form of an amorphous layer of permalloy having high permeability and low coercive force.

摘要翻译： 在包括形成在其表面上并且包括至少两层的非磁性基底和磁性薄膜的磁记录介质中，适于垂直磁化的结晶钴 - 铬合金层形式的上层被放置在 具有高渗透性和低矫顽力的坡莫合金的非晶层形式的下层。

公开(公告)号：US4393110A

公开(公告)日：1983-07-12

申请号：US341052

申请日：1982-01-20

申请人： Kazumasa Fukuda

发明人： Kazumasa Fukuda

IPC分类号： G11B5/66 ,  C08L1/18 ,  G11B5/64 ,  G11B5/716 ,  G11B5/73 ,  G11B5/733 ,  G11B5/84 ,  G11B5/855 ,  B32B3/00

CPC分类号： G11B5/855 ,  G11B5/716 ,  Y10S428/90 ,  Y10T428/2462 ,  Y10T428/268

摘要： A magnetic recording medium comprising a non-magnetic substrate having fine holes in a direction of thickness and a magnetic material filled in said fine holes. The fine holes have a diameter ranging from 200 A to 5000 A and a depth ranging from 2000 A to 5 .mu.m at a ratio of depth to diameter of 1 or more.

摘要翻译： 一种磁记录介质，包括在厚度方向上具有细孔的非磁性基材和填充在所述细孔中的磁性材料。 细孔的直径范围为200〜5000A，深度与直径为1以上的深度为2000〜5μm。

公开(公告)号：US20060132972A1

公开(公告)日：2006-06-22

申请号：US11300277

申请日：2005-12-15

申请人： Katsumichi Tagami ,  Tatsuya Harada ,  Hiroki Matsukuma ,  Tetsuya Roppongi ,  Susumu Aoki ,  Kazumasa Fukuda ,  Naoto Matono

发明人： Katsumichi Tagami ,  Tatsuya Harada ,  Hiroki Matsukuma ,  Tetsuya Roppongi ,  Susumu Aoki ,  Kazumasa Fukuda ,  Naoto Matono

IPC分类号： G11B5/147

CPC分类号： G11B5/3116 ,  G11B5/1278 ,  G11B5/1872

摘要： A thin-film magnetic head with which an error rate is decreased due to a reduction of a jitter without significant decrease in write field, is provided. The head comprises at least one inductive write head element comprising: a main magnetic pole layer having an inner saturation magnetic flux density varying from both side end surfaces in a track-width direction and a leading end surface, toward a center portion in the track-width direction of a trailing end surface; an auxiliary magnetic pole layer; and at least one coil layer, a curvature width WC of a contour line of a write field adjacent to a trailing edge on an ABS side of the main magnetic pole layer satisfying the following expression: −0.15*WT=WC

摘要翻译： 提供了一种薄膜磁头，其由于抖动的减小而不会在写入场中显着降低而误差率降低。 头包括至少一个感应写头元件，包括：主磁极层，具有从轨道宽度方向和前端表面的两个侧端面朝着轨道宽度方向的中心部分变化的内部饱和磁通密度， 后端面的宽度方向; 辅助磁极层; 以及至少一个线圈层，与主磁极层的ABS侧的后缘相邻的写入场的轮廓线的曲率宽度W C C满足以下表达式：-0.15 * 其中W T是轨道宽度，W C和W的单位是W 是纳米。

公开(公告)号：US06487041B2

公开(公告)日：2002-11-26

申请号：US09818842

申请日：2001-03-28

申请人： Noboru Yamanaka ,  Kazumasa Fukuda ,  Yuzuru Iwai

发明人： Noboru Yamanaka ,  Kazumasa Fukuda ,  Yuzuru Iwai

IPC分类号： G11B531

CPC分类号： G11B5/3967 ,  G11B5/3116 ,  G11B5/312

摘要： A gap film of a write element is provided between a first pole portion and a second pole portion. The second pole portion includes a third magnetic film and a fourth magnetic film. The third magnetic film is provided adjacent to the gap film and the fourth magnetic film is provided adjacent to the third magnetic film. The surface of the fourth magnetic film facing opposite the medium includes a first side adjacent to the third magnetic film and second sides extending outward from the first side. The second sides each incline toward the opposite side from the third magnetic film at an angle of less than 90° relative to an extended line of the first side to eliminate recording bleed occurring due to leaked magnetic field.

摘要翻译： 写元件的间隙膜设置在第一极部分和第二极部分之间。 第二极部包括第三磁性膜和第四磁性膜。 第三磁性膜被设置成与间隙膜相邻，并且第四磁性膜设置成与第三磁性膜相邻。 第四磁性膜的与介质相对的表面包括与第三磁性膜相邻的第一侧和从第一侧向外延伸的第二侧。 第二侧各自相对于第一侧的延长线以相对于第三磁性膜的相反侧倾斜90度以消除由于泄漏的磁场引起的记录渗漏。

公开(公告)号：US5530609A

公开(公告)日：1996-06-25

申请号：US251360

申请日：1994-05-31

申请人： Keiji Koga ,  Tsuneo Kagotani ,  Akinori Nishizawa ,  Kazumasa Fukuda ,  Masanori Sakai

发明人： Keiji Koga ,  Tsuneo Kagotani ,  Akinori Nishizawa ,  Kazumasa Fukuda ,  Masanori Sakai

IPC分类号： G11B5/00 ,  G11B5/02 ,  G11B5/09 ,  G11B5/187 ,  G11B5/31 ,  G11B5/39 ,  G11B5/70 ,  G11B5/706 ,  G11B5/74

CPC分类号： G11B5/3967 ,  G11B5/00 ,  G11B5/02 ,  G11B5/09 ,  G11B5/1878 ,  G11B5/3109 ,  G11B5/70 ,  G11B5/70678 ,  G11B5/74

摘要： In a method for magnetically recording and reproducing signals in and from a magnetic recording medium via a thin film magnetic head, the recording medium has a magnetic layer of up to 0.5 .mu.m thick containing hexagonal ferromagnetic particles on a non-magnetic substrate, and the magnetic head includes a recording head whose gap adjacent portion is formed of a soft magnetic material having a saturation magnetic flux density of at least 0.7 T and a reproducing MR head. In one form, the magnetic layer has a surface roughness (Ra) of up to 5 nm, and a coercivity (Hc) of at least 1,100 Oe and a squareness ratio (S) of at least 0.70. In another form, the magnetic layer contains hexagonal ferrite and has a squareness ratio (S.perp.) of at least 0.70, and the magnetic head produces a reproduction output which is subject to zero-crossing detection without passing through a differential circuit.

摘要翻译： 在通过薄膜磁头磁记录和再现磁记录介质中的信号的方法中，记录介质具有在非磁性基底上含有六角形铁磁颗粒的至多0.5μm厚的磁性层，并且 磁头包括记录头，其间隙相邻部分由具有至少0.7T的饱和磁通密度和再现MR磁头的软磁材料形成。 在一种形式中，磁性层的表面粗糙度（Ra）高达5nm，矫顽力（Hc）至少为1100Oe，矩形比（S）至少为0.70。 在另一种形式中，磁性层含有六角铁氧体，并且具有至少0.70的矩形比（S ORTHOGONAL），并且磁头产生经过过零检测而不通过差分电路的再现输出。

公开(公告)号：US5268799A

公开(公告)日：1993-12-07

申请号：US17997

申请日：1993-02-16

申请人： Joichiro Ezaki ,  Kazumasa Fukuda ,  Masanori Sakai

发明人： Joichiro Ezaki ,  Kazumasa Fukuda ,  Masanori Sakai

IPC分类号： G11B5/012 ,  G11B5/54 ,  G11B5/58 ,  G11B5/60 ,  G11B5/82

CPC分类号： G11B5/6005 ,  G11B5/012 ,  G11B5/54 ,  G11B5/58

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 and reproducing are conducted by the magnetic head which is caused to fly from the magnetic disk at at least an area of the outermost cylinder of the magnetic disk and is caused to be substantially in contact with the surface of magnetic disk at at least an 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和再现是由在磁盘的最外圆柱体的至少一个区域处从磁盘飞出并被使其基本接触的磁头来进行的 其中磁盘的表面在磁盘的至少最内圆柱上。

公开(公告)号：US4803577A

公开(公告)日：1989-02-07

申请号：US872240

申请日：1986-06-09

申请人： Joichiro Ezaki ,  Kazumasa Fukuda

发明人： Joichiro Ezaki ,  Kazumasa Fukuda

IPC分类号： G11B5/00 ,  G11B5/73 ,  G11B5/82 ,  G11B5/60 ,  G11B15/64 ,  G11B17/32 ,  G11B21/20

CPC分类号： G11B5/82 ,  G11B5/00 ,  G11B5/7315 ,  Y10S428/90

摘要： A vertical recording system using a rigid disk medium with high recording density has a substrate made of alumina silicate resin glass and a vertical magnetic anisotropic film located on said substrate. The anisotropic film has an easy axis of magnetization in the thickness direction of the film, and the hard axis of magnetization in the film plane. The maximum surface roughness R.sub.max of said disk is less than 50 .ANG., and a magnetic recording head which moves relative to the medium operates with said head contacted with the medium. A recording density higher than 200 KFRPI (kilo flux reversal per inch) is obtained by the present invention.

摘要翻译： 使用具有高记录密度的刚性盘介质的垂直记录系统具有由硅酸铝树脂玻璃制成的基板和位于所述基板上的垂直磁性各向异性膜。 各向异性膜在膜的厚度方向上具有容易的磁化轴和膜平面中的硬磁化轴。 所述盘的最大表面粗糙度Rmax小于50，并且相对于介质移动的磁记录头在与所述介质接触的头部进行操作。 通过本发明获得高于200KFRPI（千通量反转/英寸）的记录密度。