公开(公告)号：US06687082B1

公开(公告)日：2004-02-03

申请号：US09676788

申请日：2000-10-02

Applicant: Nobuyuki Ishiwata ,  Tsutomu Ishi ,  Mikiko Saito ,  Hiroaki Honjo ,  Shinsaku Saito ,  Tamaki Toba ,  Yoshihiro Nonaka

Inventor： Nobuyuki Ishiwata ,  Tsutomu Ishi ,  Mikiko Saito ,  Hiroaki Honjo ,  Shinsaku Saito ,  Tamaki Toba ,  Yoshihiro Nonaka

IPC: G11B5147

CPC classification number: G11B5/3153 ,  G11B5/3163 ,  Y10T29/49044

Abstract: A magnetic head and a manufacturing method of the magnetic head and a magnetic recording and reproducing apparatus used this head, in which the following problem is solved, are provided. A plated film realizing large saturation magnetization Bs about 2T can not realize a high resistivity at the same time, therefore, when this plated film is applied to a magnetic head, the high frequency characteristic is deteriorated. This problem is solved at the present invention. Further, the present invention provides a magnetic head that is low cost and has large saturation magnetization Bs, and has a excellent high frequency characteristic suitable for a high density recording. A magnetic head, in which a coil insulated by insulation layers is disposed between a first magnetic core for recording and a second magnetic core for recording that is disposed to face the first magnetic core for recording via a recording gap, and which executes recording by that a magnetic flux of the first and second magnetic cores for recording excited by the coil is generated from the recording gap, is provided. And at least one of the first and second magnetic cores for recording is composed of a first plated magnetic layer and a second plated magnetic layer in a state that the first plated magnetic layer is disposed at the near side of the recording gap, and saturation magnetization of the first plated magnetic layer is 1.7 T (tesla) or more. And when resistivity of the first plated magnetic layer is defined as &rgr;1 and the thickness of the first plated magnetic layer is defined as &dgr;1, and resistivity of the second plated magnetic layer is defined as &rgr;2, and the thickness of the second plated magnetic layer is defined as &dgr;2, &rgr;1

Abstract translation: 提供了磁头和磁头的制造方法以及使用该磁头的磁记录和再现装置，其中解决了以下问题。 实现大约2T的饱和磁化强度Bs的电镀膜不能同时实现高电阻率，因此当将该镀膜施加到磁头时，高频特性劣化。 在本发明中解决了这个问题。 此外，本发明提供一种低成本，饱和磁化强度高的磁头，并且具有优良的高密度记录特性。 一种磁头，其中通过绝缘层绝缘的线圈被设置在用于记录的第一磁芯和用于记录的第二磁芯之间，用于记录的第二磁芯经由记录间隙设置成面对第一磁芯进行记录，并且执行记录 提供了从记录间隙产生由线圈激发的记录的第一和第二磁芯的磁通量。 并且，第一和第二记录用磁芯中的至少一个由第一镀层磁性层和第二镀覆磁性层构成，第一镀层磁性层设置在记录间隙的近侧，饱和磁化强度 的第一镀层磁性层为1.7T（特斯拉）或更高。 并且，将第一镀层磁性层的电阻率定义为rho1，将第一镀覆磁性层的厚度定义为δ1，将第二镀覆磁性层的电阻率定义为rho2，将第二镀覆磁性层的厚度设为 定义为δ2，rho1

公开(公告)号：US20060119982A1

公开(公告)日：2006-06-08

申请号：US11329919

申请日：2006-01-10

Applicant: Hiroaki Honjo ,  Tsutomu Ishi ,  Mikiko Saito ,  Shinsaku Saito ,  Tamaki Toba ,  Yoshihiro Nonaka ,  Kazuhiko Hayashi ,  Nobuyuki Ishiwata

Inventor： Hiroaki Honjo ,  Tsutomu Ishi ,  Mikiko Saito ,  Shinsaku Saito ,  Tamaki Toba ,  Yoshihiro Nonaka ,  Kazuhiko Hayashi ,  Nobuyuki Ishiwata

IPC: G11B5/147

CPC classification number: B82Y25/00 ,  B82Y10/00 ,  G11B5/00 ,  G11B5/3103 ,  G11B5/3109 ,  G11B5/3116 ,  G11B5/3133 ,  G11B5/314 ,  G11B5/3143 ,  G11B5/3163 ,  G11B5/3967 ,  G11B5/40 ,  G11B2005/3996 ,  Y10T29/49044

Abstract: By inserting a first antistripping layer comprising a first non-magnetic layer 22 and a first conductive layer 23 between a first magnetic layer 16 and a magnetic separation layer 13, adhesion between the first conductive layer 23 and the magnetic separation layer 13 is improved to prevent the first magnetic layer 16 from stripping. In addition, by inserting a second antistripping layer comprising a second non-magnetic layer 24 and a second conductive layer 25 between a second magnetic layer 21 and a magnetic gap layer 17, adhesion between the second conductive layer 24 and the magnetic gap layer 17 is improved to prevent the second magnetic layer 25 from stripping.

Abstract translation: 通过在第一磁性层16和磁分离层13之间插入包括第一非磁性层22和第一导电层23的第一抗锯齿层，改善了第一导电层23和磁性分离层13之间的粘附，以防止 来自剥离的第一磁性层16。 此外，通过在第二磁性层21和磁隙层17之间插入包括第二非磁性层24和第二导电层25的第二抗锯齿层，第二导电层24和磁隙层17之间的粘附是 改进以防止第二磁性层25剥离。

公开(公告)号：US06780530B2

公开(公告)日：2004-08-24

申请号：US10428836

申请日：2003-05-05

Applicant: Mikiko Saito ,  Nobuyuki Ishiwata ,  Tsutomu Ishi ,  Hiroaki Honjo ,  Tamaki Toba ,  Shinsaku Saito ,  Yoshihiro Nonaka

Inventor： Mikiko Saito ,  Nobuyuki Ishiwata ,  Tsutomu Ishi ,  Hiroaki Honjo ,  Tamaki Toba ,  Shinsaku Saito ,  Yoshihiro Nonaka

IPC: B32B900

CPC classification number: B82Y25/00 ,  C22C30/00 ,  G11B5/3109 ,  G11B5/3967 ,  H01F10/007 ,  H01F10/16 ,  Y10S428/90 ,  Y10T428/1121 ,  Y10T428/115

Abstract: A magnetic material includes a main component expressed by a general formula CoNiFeX, wherein X is at least one element selected from the group consisting of Cr, Ti, V, Ru, Rh, Pd, Os, Ir and Pt, and wherein weight percentages a, b, c and d of Co, Ni, Fe and X contents, respectively, in the main component are such that 40%≦a≦10%, 5%≦b≦20%, 10%≦c≦30%, and 0%

Abstract translation: 磁性材料包括由通式CoNiFeX表示的主要成分，其中X是选自Cr，Ti，V，Ru，Rh，Pd，Os，Ir和Pt中的至少一种元素，其中重量百分数a 主成分中Co，Ni，Fe，X含量的b，c，d分别为40％<= a <= 10％，5％<= b <= 20％，10％<= c <= 30％，0％

公开(公告)号：US20080008908A1

公开(公告)日：2008-01-10

申请号：US11791117

申请日：2005-11-09

Applicant: Nobuyuki Ishiwata ,  Hiroaki Honjo ,  Katsuya Nishiyama ,  Toshihiko Nagase

Inventor： Nobuyuki Ishiwata ,  Hiroaki Honjo ,  Katsuya Nishiyama ,  Toshihiko Nagase

IPC: G11B5/39 ,  B32B15/04

CPC classification number: G11C11/15 ,  B82Y25/00 ,  H01F10/3227 ,  H01F10/3254 ,  H01L43/10 ,  Y10T428/1107 ,  Y10T428/31678

Abstract: A ferromagnetic film according to the present invention includes ferromagnetic element and nonmagnetic element and has a first portion and a second portion. Concentration of the nonmagnetic element in the first portion is lower than an average concentration of the nonmagnetic element in the ferromagnetic film. On the other hand, concentration of the nonmagnetic element in the second portion is higher than the average concentration of the nonmagnetic element in the ferromagnetic film. The nonmagnetic element includes at least one element selected from the group consisting of Zr, Ti, Nb, Ta, Hf, Mo and W. The ferromagnetic film is applied to a magnetic free layer of a magneto-resistance element in an MRAM.

Abstract translation: 根据本发明的铁磁膜包括铁磁元件和非磁性元件，并且具有第一部分和第二部分。 第一部分中的非磁性元件的浓度低于铁磁膜中的非磁性元件的平均浓度。 另一方面，第二部分中的非磁性元件的浓度高于铁磁膜中的非磁性元件的平均浓度。 非磁性元件包括从由Zr，Ti，Nb，Ta，Hf，Mo和W组成的组中选择的至少一种元素。铁磁膜被施加到MRAM中的磁阻元件的无磁层。

公开(公告)号：US07238540B2

公开(公告)日：2007-07-03

申请号：US10873269

申请日：2004-06-23

Applicant: Hiroaki Honjo ,  Shinsaku Saitho

Inventor： Hiroaki Honjo ,  Shinsaku Saitho

IPC: H01L21/00

CPC classification number: G11C11/16

Abstract: A magnetic random access memory includes a substrate; a first ferromagnetic layer; a magnetic tunnel junction (MTJ) device provided on a same side of the substrate as the first ferromagnetic layer; and a wiring layer provided between the first ferromagnetic layer and the MTJ device. The MTJ device includes a second ferromagnetic layer opposing to the wiring layer. A first perpendicular projection of the first ferromagnetic layer on the substrate and a second perpendicular projection of the second ferromagnetic layer on the substrate are different in area, and one of the first and second perpendicular projections contains the other.

Abstract translation: 磁性随机存取存储器包括：衬底; 第一铁磁层; 设置在与第一铁磁层相同的衬底侧的磁隧道结（MTJ）器件; 以及设置在第一铁磁层和MTJ器件之间的布线层。 MTJ装置包括与布线层相对的第二铁磁层。 第一铁磁层在衬底上的第一垂直投影和第二铁磁层在衬底上的第二垂直投影面积是不同的，并且第一和第二垂直投影中的一个包含另一个。

公开(公告)号：US07173793B2

公开(公告)日：2007-02-06

申请号：US10911578

申请日：2004-08-05

Applicant: Nobuyuki Ishiwata ,  Hiroaki Honjo ,  Tamaki Toba ,  Shinsaku Saito ,  Yoshihiro Nonaka ,  Tsutomu Ishi ,  Mikiko Saito ,  Keishi Ohashi

Inventor： Nobuyuki Ishiwata ,  Hiroaki Honjo ,  Tamaki Toba ,  Shinsaku Saito ,  Yoshihiro Nonaka ,  Tsutomu Ishi ,  Mikiko Saito ,  Keishi Ohashi

IPC: G11B5/147

CPC classification number: G11B5/3109 ,  G11B5/3116 ,  G11B5/313 ,  G11B5/3146 ,  G11B5/3163

Abstract: A recording head is a magnetic head in which ends on one side of opposed first and second magnetic cores form a recording gap, said other ends form a magnetic joint, coils insulated by an insulating material are provided between said first and second magnetic cores, magnetic fluxes of said first and second magnetic cores excited by said coils leak from said recording gap so that recording onto a recording medium is carried out. In said recording head, a distance from said end of said recording gap close to said magnetic medium to a contact point of said magnetic joint (hereinafter, yoke length) is not more than 20 μm. A magnetic recording/reproduction apparatus has this head.

Abstract translation: 记录头是磁头，其中在相对的第一和第二磁芯的一侧上的端部形成记录间隙，所述另一端形成磁性接头，在所述第一和第二磁芯之间设置由绝缘材料绝缘的线圈，磁性 由所述线圈激励的所述第一和第二磁芯的磁通从所述记录间隙泄漏，从而进行到记录介质上的记录。 在所述记录头中，从所述记录间隙的接近所述磁介质的端部到所述磁性接头的接触点（以下称为磁轭长度）的距离不大于20微米。 磁记录/再现装置具有该磁头。

公开(公告)号：US06795271B2

公开(公告)日：2004-09-21

申请号：US09748214

申请日：2000-12-27

Applicant: Nobuyuki Ishiwata ,  Hiroaki Honjo ,  Tamaki Toba ,  Shinsaku Saito ,  Yoshihiro Nonaka ,  Tsutomu Ishi ,  Mikiko Saito ,  Keishi Ohashi

Inventor： Nobuyuki Ishiwata ,  Hiroaki Honjo ,  Tamaki Toba ,  Shinsaku Saito ,  Yoshihiro Nonaka ,  Tsutomu Ishi ,  Mikiko Saito ,  Keishi Ohashi

IPC: G11B5147

CPC classification number: G11B5/3109 ,  G11B5/3116 ,  G11B5/313 ,  G11B5/3146 ,  G11B5/3163

Abstract: A recording head is a magnetic head in which ends on one side of opposed first and second magnetic cores form a recording gap, said other ends form a magnetic joint, coils insulated by an insulating material are provided between said first and second magnetic cores, magnetic fluxes of said first and second magnetic cores excited by said coils leak from said recording gap so that recording onto a recording medium is carried out. In said recording head, a distance from said end of said recording gap close to said magnetic medium to a contact point of said magnetic joint (hereinafter, yoke length) is not more than 20 &mgr;m. A magnetic recording/reproduction apparatus has this head.

Abstract translation: 记录头是磁头，其中在相对的第一和第二磁芯的一侧上的端部形成记录间隙，所述另一端形成磁性接头，在所述第一和第二磁芯之间设置由绝缘材料绝缘的线圈，磁性 由所述线圈激励的所述第一和第二磁芯的磁通从所述记录间隙泄漏，从而进行到记录介质上的记录。 在所述记录头中，从所述记录间隙的接近所述磁介质的端部到所述磁性接头的接触点（以下称为磁轭长度）的距离不大于20微米。 磁记录/再现装置具有该磁头。

公开(公告)号：US06493195B1

公开(公告)日：2002-12-10

申请号：US09651068

申请日：2000-08-30

Applicant: Kazuhiko Hayashi ,  Keishi Ohashi ,  Nobuyuki Ishiwata ,  Masafumi Nakada ,  Eizo Fukami ,  Hiroaki Honjo ,  Hisanao Tsuge ,  Atsushi Kamijo

Inventor： Kazuhiko Hayashi ,  Keishi Ohashi ,  Nobuyuki Ishiwata ,  Masafumi Nakada ,  Eizo Fukami ,  Hiroaki Honjo ,  Hisanao Tsuge ,  Atsushi Kamijo

IPC: G11B5127

CPC classification number: B82Y25/00 ,  B82Y10/00 ,  B82Y40/00 ,  G01R33/09 ,  G11B5/3133 ,  G11B5/3163 ,  G11B5/3903 ,  G11B5/3909 ,  G11B5/40 ,  H01F10/3268 ,  H01F41/302

Abstract: A magnetoresistance element includes a lower electrode layer, a magnetoresistance effect layer, an upper electrode layer and a lower electrode anti-erosion/flaking layer. The lower electrode anti-erosion/flaking layer, which is formed before a photoresist layer remaining on the patterned lower electrode layer is removed, is formed around the lower electrode layer so that its edge facing the lower electrode layer will be in contact with the edge of the lower electrode layer. By use of the lower electrode anti-erosion/flaking layer, the edge of the lower electrode layer is protected from being exposed to a release agent containing a dissolved photoresist in a photoresist layer removal step (when the photoresist layer remaining on the patterned lower electrode layer is removed), thereby the increase of roughness of the edge of the lower electrode layer due to erosion/flaking of the edge in the photoresist removal step can be avoided, and thereby electrical shorts between the upper electrode layer and the lower electrode layer can be eliminated, and thereby a magnetoresistance element of high sensitivity and high performance can be obtained and manufacturing yield of the magnetoresistance elements can be improved.

Abstract translation: 磁阻元件包括下电极层，磁阻效应层，上电极层和下电极抗侵蚀/剥落层。 在除去形成在图案化的下电极层上的光致抗蚀剂层之前形成的下电极抗腐蚀/剥离层围绕下电极层形成，使得其面向下电极层的边缘将与边缘 的下电极层。 通过使用下电极抗腐蚀/剥落层，在光致抗蚀剂层去除步骤中（当残留在图案化的下电极上的光致抗蚀剂层时，保护下电极层的边缘不暴露于含有溶解的光致抗蚀剂的脱模剂 层），由此可以避免由于光致抗蚀剂去除步骤中的边缘的侵蚀/剥落引起的下电极层的边缘的粗糙度的增加，从而可以使上电极层和下电极层之间的电短路 从而可以获得高灵敏度和高性能的磁阻元件，并且可以提高磁阻元件的制造成品率。

公开(公告)号：US06466416B1

公开(公告)日：2002-10-15

申请号：US09707805

申请日：2000-11-07

Applicant: Hiroaki Honjo ,  Nobuyuki Ishiwata ,  Tsutomu Ishi ,  Mikiko Saito ,  Shinsaku Saito ,  Tamaki Toba ,  Yoshihiro Nonaka

Inventor： Hiroaki Honjo ,  Nobuyuki Ishiwata ,  Tsutomu Ishi ,  Mikiko Saito ,  Shinsaku Saito ,  Tamaki Toba ,  Yoshihiro Nonaka

IPC: G11B5127

CPC classification number: G11B5/3967 ,  G11B5/3109 ,  G11B5/313 ,  G11B5/3903

Abstract: Disclosed is a magnetic heads suitable for high density recording which comprises an ID head where a CoNiFe film or a CoNiFeX film is formed by a physical vapor deposition method and further a plated film of CoNiFe etc. is formed while avoiding vanishment of a seed layer. The ID head shows high reliability and high production efficiency. The upper magnetic pole of the ID head is composed of a laminated layers of a first magnetic layer 13 of a CoNiFe film or a CoNiFeX film which is formed by a physical vapor deposition method, a second magnetic layer 14 of NiFe layer composing a seed layer laminated thereon, and a third magnetic layer 11 of CoNiFe plated film etc. further laminated on the second layer.

Abstract translation: 公开了一种适用于高密度记录的磁头，其包括通过物理气相沉积法形成CoNiFe膜或CoNiFeX膜的ID头，并且还形成CoNiFe等的镀膜，同时避免种子层的消失。 ID头显示出高可靠性和高生产效率。 ID头的上磁极由CoNiFe膜的第一磁性层13或通过物理气相沉积法形成的CoNiFeX膜的层压层构成，构成种子层的NiFe层的第二磁性层14 层压在其上，以及进一步层压在第二层上的CoNiFe镀膜等的第三磁性层11。

公开(公告)号：US20050185339A1

公开(公告)日：2005-08-25

申请号：US10911578

申请日：2004-08-05

Applicant: Nobuyuki Ishiwata ,  Hiroaki Honjo ,  Tamaki Toba ,  Shinsaku Saito ,  Yoshihiro Nonaka ,  Tsutomu Ishi ,  Mikiko Saito ,  Keishi Ohashi

Inventor： Nobuyuki Ishiwata ,  Hiroaki Honjo ,  Tamaki Toba ,  Shinsaku Saito ,  Yoshihiro Nonaka ,  Tsutomu Ishi ,  Mikiko Saito ,  Keishi Ohashi

IPC: G11B5/127 ,  G11B5/31 ,  G11B5/147

CPC classification number: G11B5/3109 ,  G11B5/3116 ,  G11B5/313 ,  G11B5/3146 ,  G11B5/3163

Abstract: A recording head is a magnetic head in which ends on one side of opposed first and second magnetic cores form a recording gap, said other ends form a magnetic joint, coils insulated by an insulating material are provided between said first and second magnetic cores, magnetic fluxes of said first and second magnetic cores excited by said coils leak from said recording gap so that recording onto a recording medium is carried out. In said recording head, a distance from said end of said recording gap close to said magnetic medium to a contact point of said magnetic joint (hereinafter, yoke length) is not more than 20 μm. A magnetic recording/reproduction apparatus has this head.

Abstract translation: 记录头是磁头，其中在相对的第一和第二磁芯的一侧上的端部形成记录间隙，所述另一端形成磁性接头，在所述第一和第二磁芯之间设置由绝缘材料绝缘的线圈，磁性 由所述线圈激励的所述第一和第二磁芯的磁通从所述记录间隙泄漏，从而进行到记录介质上的记录。 在所述记录头中，从所述记录间隙的接近所述磁介质的端部到所述磁性接头的接触点（以下称为磁轭长度）的距离不大于20微米。 磁记录/再现装置具有该磁头。