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1. 发明申请

US20080074803A1 Magnetic head of magnetoresistance effect type with high resistance to external stress 有权
标题翻译：具有高耐外部应力的磁阻效应型磁头
公开(公告)号：US20080074803A1
公开(公告)日：2008-03-27
申请号：US11900533
申请日：2007-09-11
申请人： Naoki Koyama , Koichi Nishioka , Kouji Okazaki , Shuichi Kojima , Azusa Hori , Satoshi Shigematsu , Yukimasa Okada
发明人： Naoki Koyama , Koichi Nishioka , Kouji Okazaki , Shuichi Kojima , Azusa Hori , Satoshi Shigematsu , Yukimasa Okada
IPC分类号： G11B5/33
CPC分类号： G11B5/39
摘要： Embodiments of the present invention prevent a pinned layer from suffering magnetization reversal by external stress in a magnetic head of magnetoresistance effect type which has a synthetic ferri-magnetic pinned layer structure with an antiferromagnetic layer of IrMnCr. According to one embodiment, a read element of a magnetoresistive head is made up of a antiferromagnetic layer, a first pinned layer, an antiferromagnetically coupled layer 4, a second pinned layer, and a free layer, which are stacked one over another. The first and second pinned layers and have a composition of Co75Fe25 and Co95Fe5, respectively, and a thickness of 18 Å (3.5 nm·T) and 21 Å (3.9 nm·T), respectively, so as to reduce the difference in anisotropic energy between the first pinned layer in contact with the antiferromagnetic layer and the second pinned layer in contact with the nonmagnetic conductive layer. In this way it is possible to reduce the difference |λ1−λ2| in magnetostriction constant between the first and second pinned layers and below 5.0×10−6. Thus it is possible to protect the pinned layer from external stress and magnetic field which rotate the direction of magnetization.
摘要翻译：本发明的实施例通过具有IrMnCr反铁磁性层的合成铁磁性固定层结构的磁阻效应型磁头防止被钉扎层受到外部应力的磁化反转。根据一个实施例，磁阻头的读取元件由反铁磁层，第一被钉扎层，反铁磁耦合层4，第二钉扎层和自由层叠加而成。第一和第二被钉扎层分别具有Co Fe 25 和，并且分别具有18（3.5nm.T）和21（3.9nm.T）的厚度，以便减少与反铁磁层接触的第一被钉扎层与第二被钉扎层之间的各向异性能的差异与非磁性导电层接触。以这种方式，可以减小| lambda1-lambda2 |的差异在第一和第二被钉扎层之间的磁致伸缩常数以及5.0×10 -6以下。因此，可以保护被钉扎层免受旋转磁化方向的外部应力和磁场。

2. 发明授权

US07957109B2 Magnetic head of magnetoresistance effect type with high resistance to external stress 有权
标题翻译：具有高耐外部应力的磁阻效应型磁头
公开(公告)号：US07957109B2
公开(公告)日：2011-06-07
申请号：US11900533
申请日：2007-09-11
申请人： Naoki Koyama , Koichi Nishioka , Kouji Okazaki , Shuichi Kojima , Azusa Hori , Satoshi Shigematsu , Yukimasa Okada
发明人： Naoki Koyama , Koichi Nishioka , Kouji Okazaki , Shuichi Kojima , Azusa Hori , Satoshi Shigematsu , Yukimasa Okada
IPC分类号： G11B5/39 , G11B5/127
CPC分类号： G11B5/39
摘要： A tunnel magnetoresistance effect magnetic head having between magnetic shield layers, an antiferromagnetic layer, a pinned layer which has the direction of magnetization pinned by exchange coupling with the antiferromagnetic layer, an insulating layer, and a free layer whose direction of magnetization rotates relatively to external magnetic fields, wherein the antiferromagnetic layer is of an antiferromagnetic substance composed mainly of IrMn, the pinned layer is made up of a first pinned layer of CoFe alloy in contact with the antiferromagnetic layer and a second pinned layer of CoFeB alloy which is antiferromagnetically coupled with the first pinned layer, and the first and second pinned layers have the amount of magnetization such that the difference M1−M2 is in the range of 0
摘要翻译：具有磁屏蔽层之间的隧道磁阻效应磁头，反铁磁层，具有通过与反铁磁层交换耦合固定的磁化方向的被钉扎层，绝缘层和磁化方向相对于外部的自由层磁场，其中反铁磁层是主要由IrMn组成的反铁磁性物质，被钉扎层由与反铁磁层接触的第一CoFe合金层和与铁磁性合金反铁磁合金的第二被钉扎层组成第一被钉扎层，并且第一和第二钉扎层具有磁化量，使得差值M1-M2在0

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