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1. 发明授权

US5388019A Magnetic thin film structures fabricated with edge closure layers 失效
标题翻译：用边缘封闭层制造的磁性薄膜结构
公开(公告)号：US5388019A
公开(公告)日：1995-02-07
申请号：US163670
申请日：1993-12-07
申请人： Bernell E. Argyle , Thomas C. Arnoldussen , Thomas J. Beaulieu , Dean A. Herman, Jr. , Sol Krongelb , Hin P. E. Lee , Daniel A. Nepela , Bojan Petek , Lubomyr T. Romankiw , John C. Slonczewski
发明人： Bernell E. Argyle , Thomas C. Arnoldussen , Thomas J. Beaulieu , Dean A. Herman, Jr. , Sol Krongelb , Hin P. E. Lee , Daniel A. Nepela , Bojan Petek , Lubomyr T. Romankiw , John C. Slonczewski
IPC分类号： G11B5/31 , H01F10/32 , H01F41/34 , G11B5/147
CPC分类号： B82Y25/00 , H01F10/3268 , H01F41/34 , Y10T29/49032 , Y10T29/49034
摘要： Magnetic thin film structures are disclosed including a laminate of a layer of nonmagnetic material sandwiched between first and second layers of magnetic material and at least one edge closure layer of magnetic material disposed on a side edge of the laminate with the edge closure layer being in magnetic contact with the first and second layers of magnetic material. The edge closure layer eliminates magnetic edge closure domains and magnetic edge-curling walls in the yoke and poletip regions, or in a fluxguide of a magnetic recording head to substantially eliminate Barkhausen noise and wall network instabilities. Multiple layer laminates are also disclosed having a plurality of nonmagnetic layers each of which are sandwiched between layers of magnetic material and wherein the laminate includes edge closure layers that contact all the magnetic layers. Several methods are disclosed for fabricating the laminate. In one class of technique, the side edges are deposited together with a top layer in a single plating operation. In an another embodiment, the side edge closure layers are separately plated. Another embodiment provides for a layer of antiferromagnetic material deposited between the nonmagnetic layer and one of the magnetic layers to provide additional anisotropy.
摘要翻译：公开了磁性薄膜结构，其包括夹在第一和第二磁性材料层之间的非磁性材料层的叠层，以及设置在层压板的侧边缘上的至少一个磁性材料的边缘封闭层，边缘封闭层处于磁性与第一和第二层磁性材料接触。边缘封闭层消除磁轭和poletip区域中的磁边缘封闭域和磁性边缘卷曲壁，或者在磁记录头的磁通导向器中消除巴克豪森噪声和墙网络不稳定性。还公开了多层层压板，其具有多个非磁性层，每个非磁性层都夹在磁性材料层之间，并且其中层压板包括接触所有磁性层的边缘封闭层。公开了制造层压板的几种方法。在一类技术中，在单个电镀操作中，侧边缘与顶层一起沉积在一起。在另一个实施例中，侧边缘封闭层被单独地电镀。另一个实施例提供沉积在非磁性层和一个磁性层之间的反铁磁材料层，以提供额外的各向异性。

2. 发明授权

US5032945A Magnetic thin film structures fabricated with edge closure layers 失效
标题翻译：用边缘封闭层制造的磁性薄膜结构
公开(公告)号：US5032945A
公开(公告)日：1991-07-16
申请号：US432649
申请日：1989-11-07
申请人： Bernell E. Argyle , Thomas C. Arnoldussen , Thomas J. Beaulieu , Dean A. Herman, Jr. , Sol Krongelb , Hin P. E. Lee , Daniel A. Nepela , Bojan Petek , Lubomyr T. Romankiw , John C. Slonczewski
发明人： Bernell E. Argyle , Thomas C. Arnoldussen , Thomas J. Beaulieu , Dean A. Herman, Jr. , Sol Krongelb , Hin P. E. Lee , Daniel A. Nepela , Bojan Petek , Lubomyr T. Romankiw , John C. Slonczewski
IPC分类号： G11B5/31 , H01F10/32 , H01F41/34
CPC分类号： B82Y25/00 , H01F10/3268 , H01F41/34 , Y10T29/49032 , Y10T29/49034
摘要： Magnetic thin film structures are disclosed including a laminate of a layer of nonmagnetic material sandwiched between first and second layers of magnetic material and at least one edge closure layer of magnetic material disposed on a side edge of the laminate with the edge closure layer being in magnetic contact with the first and second layers of magnetic material. The edge closure layer eliminates magnetic edge closure domains and magnetic edge-curling walls in the yoke and poletip regions, or in a fluxguide of a magnetic recording head to substantially eliminate Barkhausen noise and wall network instabilities. Multiple layer laminates are also disclosed having a plurality of nonmagnetic layers each of which are sandwiched between layers of magnetic material and wherein the laminate includes edge closure layers that contact all the magnetic layers. Several methods are disclosed for fabricating the laminate. In one class of technique, the side edges are deposited together with a top layer in a single plating operation. In an another embodiment, the side edge closure layers are separately plated. Another embodiment provides for a layer of antiferromagnetic material deposited between the nonmagnetic layer and one of the magnetic layers to provide additional anisotropy.

3. 发明授权

US5331728A Method of fabricating magnetic thin film structures with edge closure layers 失效
标题翻译：制造具有边缘封闭层的磁性薄膜结构的方法
公开(公告)号：US5331728A
公开(公告)日：1994-07-26
申请号：US686782
申请日：1991-05-13
申请人： Bernell E. Argyle , Thomas C. Arnoldussen , Thomas J. Beaulieu , Dean A. Herman, Jr. , Sol Krongelb , Hin P. E. Lee , Daniel A. Nepela , Bojan Petek , Lubomyr T. Romankiw , John C. Slonczewski
发明人： Bernell E. Argyle , Thomas C. Arnoldussen , Thomas J. Beaulieu , Dean A. Herman, Jr. , Sol Krongelb , Hin P. E. Lee , Daniel A. Nepela , Bojan Petek , Lubomyr T. Romankiw , John C. Slonczewski
IPC分类号： G11B5/31 , H01F10/32 , H01F41/34 , G11B5/42
CPC分类号： B82Y25/00 , H01F10/3268 , H01F41/34 , Y10T29/49032 , Y10T29/49034
摘要： Magnetic thin film structures including a laminate of a layer of nonmagnetic material sandwiched between first and second layers of magnetic material and at least one edge closure layer of magnetic material disposed on a side edge of the laminate with the edge closure layer being in magnetic contact with the first and second layers of magnetic material. The edge closure layer eliminates magnetic edge closure domains and magnetic edge-curling walls in the yoke and poletip regions, or in a fluxguide of a magnetic recording head to substantially eliminate Barkhausen noise and wall network instabilities. Multiple layer laminates are also disclosed having a plurality of nonmagnetic layers each of which are sandwiched between layers of magnetic material and wherein the laminate includes edge closure layers that contact all the magnetic layers. Several methods are disclosed for fabricating the laminate. In one class of technique, the side edges are deposited together with a top layer in a single plating operation. In an another embodiment, the side edge closure layers are separately plated. Another embodiment provides for a layer of antiferromagnetic material deposited between the nonmagnetic layer and one of the magnetic layers to provide additional anisotropy.
摘要翻译：磁性薄膜结构包括夹在第一和第二磁性材料层之间的非磁性材料层的叠层，以及设置在层压板的侧边缘上的至少一个磁性材料的边缘封闭层，边缘封闭层与第一层和第二层磁性材料。边缘封闭层消除磁轭和poletip区域中的磁边缘封闭域和磁性边缘卷曲壁，或者在磁记录头的磁通导向器中消除巴克豪森噪声和墙网络不稳定性。还公开了多层层压板，其具有多个非磁性层，每个非磁性层都夹在磁性材料层之间，并且其中层压板包括接触所有磁性层的边缘封闭层。公开了制造层压板的几种方法。在一类技术中，在单个电镀操作中，侧边缘与顶层一起沉积在一起。在另一个实施例中，侧边缘封闭层被单独地电镀。另一个实施例提供沉积在非磁性层和一个磁性层之间的反铁磁材料层，以提供额外的各向异性。

4. 发明授权

US3954520A Process for the production of magnetic materials 失效
标题翻译：磁性材料生产工艺
公开(公告)号：US3954520A
公开(公告)日：1976-05-04
申请号：US449861
申请日：1974-03-11
申请人： Thomas J. Beaulieu , Michael A. Marchese , Franklin T. Plante , Robert H. Tlaskal
发明人： Thomas J. Beaulieu , Michael A. Marchese , Franklin T. Plante , Robert H. Tlaskal
IPC分类号： B22F9/24 , H01F1/06 , H01F1/02
CPC分类号： B22F9/24 , H01F1/06
摘要： The problem of characterizing metallic magnetic particles as suitable or unsuitable for use in a high density magnetic recording media is believed to have been solved by use of a figure of merit designated as "W/H.sub.c ", and defined herein.It has been found that metallic magnetic particles which exhibit a W/H.sub.c of about 1.2 or less offer the most desirable magnetic recording characteristics for high density magnetic recording media. With this characterization technique available, it has been determined that most quantities of metallic magnetic cobalt-phosphorus particles produced by chemical reduction have W/H.sub.c 's greater than 1.2, and are unsuitable for use in high density magnetic recording media. Using W/H.sub.c, it has been possible to recognize those metallic particles which are suitable for use in high density recording media, and to engage in experimentation to determine what methods of manufacturing are required for the production of suitable high density recording particles.Surprisingly, following the recognition of the problem, it has been found that production of cobalt-phosphorus particles by controlled chemical reduction in a D.C. magnetic field of at least about 200 gauss consistently produces magnetic particles having W/H.sub.c of about 1.2 or less. In the absence of a D.C. magnetic field of at least about 200 gauss, cobalt-phosphorus particles having a W/H.sub.c as low as 1.2 are rarely produced.
摘要翻译：认为金属磁性颗粒在高密度磁记录介质中适用或不合适的特性的问题被认为是通过使用被称为“W / Hc”的品质因数来解决的，并且在此定义。

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