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1. 发明授权

US07916434B2 Tunnel magnetoresistive effect element with limited electric popping output voltage 有权
标题翻译：隧道磁阻效应元件具有有限的电涌输出电压
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。

2. 发明授权

US07120990B2 Method for manufacturing thin film magnetic head with improved performance 失效
标题翻译：具有改进性能的薄膜磁头制造方法
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。

3. 发明授权

US07061718B2 Thin film magnetic head having thin film coil embedded in first insulating layer covered with second insulating layer 失效
标题翻译：薄膜磁头，其具有嵌入第一绝缘层中的第二绝缘层的薄膜线圈
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。

4. 发明申请

US20050044693A1 Method for manufacturing thin film magnetic head with improved performance 失效
标题翻译：具有改进性能的薄膜磁头制造方法
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。

5. 发明授权

US6163436A Thin film magnet head with improved performance 失效
标题翻译：薄膜磁头具有改进的性能
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。

6. 发明授权

US6130805A Thin film magnetic head having upper pole chip formed over insulating layer 失效
标题翻译：薄膜磁头具有形成在绝缘层上的上极芯片
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。

7. 发明授权

US5072320A Magnetic recording and reproducing apparatus having improved durability 失效
标题翻译：具有改善的耐久性的磁记录和重放装置
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。

8. 发明授权

US4642270A Magnetic recording medium 失效
标题翻译：磁记录介质
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。

9. 发明授权

US4393110A Magnetic recording medium 失效
标题翻译：磁记录介质
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。

10. 发明授权

US07443633B2 Thin-film magnetic head for perpendicular magnetic recording and manufacturing method of thin-film magnetic head 有权
标题翻译：用于垂直磁记录的薄膜磁头和薄膜磁头的制造方法
公开(公告)号：US07443633B2
公开(公告)日：2008-10-28
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： G11B5/127
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的单位和 W N是纳米。

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