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1.发明授权Patterned magnetic recording media with regions rendered nonmagnetic by ion irradiation 有权图案磁记录介质，通过离子辐照使磁场呈非磁性公开(公告)号：US06383598B1
公开(公告)日：2002-05-07
申请号：US09602606
申请日：2000-06-21
IPC分类号： B32B302
CPC分类号： G11B5/855 , C22C5/04 , G11B5/82 , Y10T428/24479 , Y10T428/31
摘要： A patterned magnetic recording disk has a magnetic recording layer patterned into discrete magnetic and nonmagnetic regions having substantially the same chemical composition. The magnetic regions have a chemically-ordered L12 crystalline structure and the nonmagnetic regions have a chemically-disordered crystalline structure. The chemically-ordered intermetallic compound CrPt3, which is ferromagnetic, is rendered paramagnetic by ion irradiation. This CrPt3 material is patterned by irradiating local regions through a mask to create nonmagnetic regions. The ions pass through the openings in the mask and impact the chemically-ordered CrPt3 in selected regions corresponding to the pattern of holes in the mask. The ions disrupt the ordering of the Cr and Pt atoms in the unit cell and transform the CrPt3 into paramagnetic regions corresponding to the mask pattern, with the regions of the film not impacted by the ions retaining their chemically-ordered structure.
摘要翻译： 图案化磁记录盘具有图案化成具有基本上相同化学成分的离散磁性和非磁性区域的磁记录层。 磁性区域具有化学有序的L12结晶结构，非磁性区域具有化学无序的结晶结构。 铁磁性的化学有序金属间化合物CrPt3通过离子照射而变得顺磁性。 通过用掩模照射局部区域来形成该CrPt3材料以形成非磁性区域。 离子通过掩模中的开口，并在对应于掩模中的孔图案的选定区域中冲击化学有序的CrPt3。 离子破坏单元电池中Cr和Pt原子的排列，并将CrPt3转变成对应于掩模图案的顺磁区域，膜的区域不受保留其化学有序结构的离子的影响。
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公开(公告)号：USRE40726E1
公开(公告)日：2009-06-09
申请号：US10630818
申请日：2003-07-29
IPC分类号： G11B5/66
CPC分类号： B82Y10/00 , G11B5/66 , G11B5/743 , Y10T428/24942 , Y10T428/2495
摘要： A magnetic recording disk is patterned into discrete magnetic and nonmagnetic regions with the magnetic regions serving as the magnetic recording data bits. The magnetic recording layer comprises two ferromagnetic films separated by a nonferromagnetic spacer film. The spacer film material composition and thickness is selected such that the first and second ferromagnetic films are antiferromagnetically coupled across the spacer film. After this magnetic recording layer has been formed on the disk substrate, ions are irradiated onto it through a patterned mask. The ions disrupt the spacer film and thereby destroy the antiferromagnetic coupling between the two ferromagnetic films. As a result, in the regions of the magnetic recording layer that are ion-irradiated the first and second ferromagnetic films are essentially ferromagnetically coupled so that the magnetic moments from the ferromagnetic films are parallel and produce a magnetic moment that is essentially the sum of the moments from the two films. In the non-irradiated regions of the magnetic recording layer, the first and second ferromagnetic films remain antiferromagnetically coupled so that their magnetic moments are oriented antiparallel. The composition and thicknesses of the first and second ferromagnetic films are selected such that essentially no magnetic field is detectable at a predetermined distance above the magnetic recording layer corresponding to the height that the magnetic recording head would be located.
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3.发明授权公开(公告)号：US06391430B1
公开(公告)日：2002-05-21
申请号：US09602609
申请日：2000-06-21
IPC分类号： B32B702
CPC分类号： B82Y10/00 , G11B5/66 , G11B5/743 , Y10T428/24942 , Y10T428/2495
摘要： A magnetic recording disk is patterned into discrete magnetic and nonmagnetic regions with the magnetic regions serving as the magnetic recording data bits. The magnetic recording layer comprises two ferromagnetic films separated by a nonferromagnetic spacer film. The spacer film material composition and thickness is selected such that the first and second ferromagnetic films are antiferromagnetically coupled across the spacer film. After this magnetic recording layer has been formed on the disk substrate, ions are irradiated onto it through a patterned mask. The ions disrupt the spacer film and thereby destroy the antiferromagnetic coupling between the two ferromagnetic films. As a result, in the regions of the magnetic recording layer that are ion-irradiated the first and second ferromagnetic films are essentially ferromagnetically coupled so that the magnetic moments from the ferromagnetic films are parallel and produce a magnetic moment that is essentially the sum of the moments from the two films. In the non-irradiated regions of the magnetic recording layer, the first and second ferromagnetic films remain antiferromagnetically coupled so that their magnetic moments are oriented antiparallel. The composition and thicknesses of the first and second ferromagnetic films are selected such that essentially no magnetic field is detectable at a predetermined distance above the magnetic recording layer corresponding to the height that the magnetic recording head would be located.
摘要翻译： 将磁记录盘图案化成具有磁区用作磁记录数据位的离散磁和非磁性区域。 磁记录层包括由非铁磁隔离膜隔开的两个铁磁膜。 选择间隔膜材料组成和厚度使得第一和第二铁磁膜跨隔离膜反铁磁耦合。 在磁盘基板上形成磁记录层之后，通过图形掩模将离子照射到其上。 离子破坏间隔膜，从而破坏两个铁磁膜之间的反铁磁耦合。 结果，在离子照射的磁记录层的区域中，第一和第二铁磁膜基本上是铁磁耦合的，使得来自铁磁性膜的磁矩平行并产生磁矩，其基本上是 两部影片的片刻。 在磁记录层的未照射区域中，第一和第二铁磁膜保持反铁磁耦合，使得它们的磁矩反向取向。 选择第一和第二铁磁膜的组成和厚度，使得在对应于磁记录头将被定位的高度的磁记录层上方的预定距离处基本上不可检测到磁场。
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4.发明授权Magnetic recording media with magnetic bit regions patterned by ion irradiation 有权具有通过离子照射图案化的磁性位区的磁记录介质公开(公告)号：US06383597B1
公开(公告)日：2002-05-07
申请号：US09602581
申请日：2000-06-21
IPC分类号： G11B565
CPC分类号： B82Y10/00 , G11B5/653 , G11B5/656 , G11B5/74 , G11B5/743 , G11B5/82 , G11B5/855 , G11B2005/0029 , Y10T428/12875 , Y10T428/24479 , Y10T428/31
摘要： A patterned magnetic recording disk has a magnetic recording layer patterned into discrete magnetic and nonmagnetic regions having substantially the same chemical composition. The nonmagnetic regions have a chemically-ordered L12 crystalline structure and the magnetic regions have a chemically-disordered crystalline structure. The chemically-ordered intermetallic compound FePt3, which is nonferromagnetic, is rendered ferromagnetic by ion irradiation. This FePt3 material can be patterned by irradiating local regions through a mask to create magnetic regions that serve as the magnetic bits. The ions pass through the openings in the mask and impact the chemically-ordered FePt3 in selected regions corresponding to the pattern of holes in the mask. The ions disrupt the ordering of the Fe and Pt atoms in the unit cell and transform the FePt3 into magnetic regions corresponding to the mask pattern, with the regions of the film not impacted by the ions retaining their chemically-ordered structure.
摘要翻译： 图案化磁记录盘具有图案化成具有基本上相同化学成分的离散磁性和非磁性区域的磁记录层。 非磁性区域具有化学有序的L12晶体结构，并且磁性区域具有化学无序的结晶结构。 化学有序的金属间化合物FePt3是非铁磁性的，通过离子辐照形成铁磁性。 该FePt3材料可以通过用掩模照射局部区域来形成，以产生用作磁性位的磁性区域。 离子通过掩模中的开口，并在对应于掩模中的孔图案的选定区域内冲击化学有序的FePt3。 离子破坏单位晶胞中Fe和Pt原子的排序，并将FePt3转变成对应于掩模图案的磁性区域，膜的区域不受保留其化学有序结构的离子的影响。
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公开(公告)号：US07989096B2
公开(公告)日：2011-08-02
申请号：US12691603
申请日：2010-01-21
IPC分类号： G11B5/66
摘要： A recording medium providing improved writeability in perpendicular recording applications includes a magnetic recording layer having an axis of magnetic anisotropy substantially perpendicular to the surface thereof, an exchange-spring layer ferromagnetically exchange coupled to the magnetic recording layer and having a coercivity less than the magnetic recording layer coercivity, and a coupling layer between the magnetic recording layer and the exchange-spring layer. The coupling layer regulates the ferromagnetic exchange coupling between the magnetic recording layer and the exchange-spring layer.
摘要翻译： 在垂直记录应用中提供改善的写入能力的记录介质包括具有基本上垂直于其表面的磁各向异性轴的磁记录层，耦合到磁记录层并具有小于磁记录的矫顽磁力的磁性交换弹簧层 层矫顽力和磁记录层与交换弹簧层之间的耦合层。 耦合层调节磁记录层与交换弹簧层之间的铁磁交换耦合。
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6.发明授权Antiferromagnetically coupled media for magnetic recording with weak coupling layer 失效用于具有弱耦合层的磁记录的反铁磁耦合介质公开(公告)号：US07556870B2
公开(公告)日：2009-07-07
申请号：US11204979
申请日：2005-08-15
IPC分类号： G11B5/66
CPC分类号： G11B5/66
摘要： An embodiment of the invention is a layered magnetic thin film structure that uses antiferromagnetically coupled (AFC) magnetic layers where the top layer structure consists of an upper magnetic layer that is weakly ferromagnetically coupled via a nonmagnetic or weakly magnetic exchange coupling layer (interlayer) to a ferromagnetic exchange enhancing layer that is in turn, AF coupled to the lower ferromagnetic layer of the AFC structure. Preferred materials for the weak coupling layer include alloys of cobalt such as CoRu, CoBRu and CoCr in which the Co content is below the point at which the material would be ferromagnetic. A second embodiment of the invention is a laminated, AF-coupled media structure. In this structure the lower AFC layer that makes up the lower laminate layer includes: the middle magnetic layer, the weak ferromagnetic coupling layer, and the exchange enhancing layer.
摘要翻译： 本发明的一个实施方案是使用反铁磁耦合（AFC）磁性层的层状磁性薄膜结构，其中顶层结构由通过非磁性或弱磁性交换耦合层（中间层）弱铁磁耦合的上部磁性层组成， 铁磁交换增强层，其依次是AF耦合到AFC结构的下铁磁层。 用于弱耦合层的优选材料包括诸如CoRu，CoBRu和CoCr的钴的合金，其中Co含量低于材料将是铁磁性的点。 本发明的第二实施例是层叠的AF耦合介质结构。 在该结构中，构成下层叠层的下部AFC层包括：中间磁性层，弱铁磁性结合层和交换增强层。
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7.发明申请MAGNETIC RECORDING SYSTEM WITH MEDIUM HAVING ANTIFERROMAGNETIC-TO- FERROMAGNETIC TRANSITION LAYER EXCHANGE-COUPLED TO RECORDING LAYER 审中-公开磁记录系统，具有与抗磁反应转移层交换耦合到记录层的介质公开(公告)号：US20080100964A1
公开(公告)日：2008-05-01
申请号：US11553215
申请日：2006-10-26
CPC分类号： G11B5/64 , G11B5/1278 , G11B5/3103
摘要： A magnetic recording disk drive has a bilayer recording medium of a high-anisotropy recording layer and an exchange-coupled antiferromagnetic-to-ferromagnetic (AF-F) transition layer. The transition layer has an AF-F transition temperature (TAF-F) that decreases relatively rapidly with increasing applied magnetic field. Thus the transition layer has a transition field HAF-F(T), which is the applied magnetic field required to transition the material from antiferromagnetic to ferromagnetic at temperature T without the need to heat the layer. At ambient temperature and in the absence of HW, the transition layer is antiferromagnetic and the switching field H0 of the bilayer is just the H0 of the high-anisotropy recording layer, which is typically much higher than HW. In the presence of the write field HW the transition layer transitions from antiferromagnetic to ferromagnetic so that data can be written to the recording by the mere application of the write field HW without the need to heat the transition layer or recording layer. The transition layer may be formed of Fe(RhM), where M is an element selected from V, Mn, Au and Ni.
摘要翻译： 磁记录盘驱动器具有高各向异性记录层和交换耦合的反铁磁到铁磁（AF-F）过渡层的双层记录介质。 过渡层具有随着施加的磁场增加而相对快速地减小的AF-F转变温度（T AF AF F F）。 因此，过渡层具有过渡场H AF-F（T），其是在温度T下将材料从反铁磁转变为铁磁所需的施加磁场，而不需要加热该层。 在环境温度下和在不存在的情况下，过渡层是反铁磁性的，并且双层的开关场H 0正好是H
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8.发明授权Exchange-coupled magnetoresistive sensor with a coercive ferrite layer and an oxide underlayer having a spinal lattice structure 失效具有矫顽铁氧体层和具有脊椎晶格结构的氧化物底层的交换耦合磁阻传感器公开(公告)号：US06992866B2
公开(公告)日：2006-01-31
申请号：US10931315
申请日：2004-08-31
申请人： Matthew Joseph Carey , Eric Edward Fullerton , Bruce Alvin Gurney , Thai Le , Stefan Maat , Philip Milton Rice
发明人： Matthew Joseph Carey , Eric Edward Fullerton , Bruce Alvin Gurney , Thai Le , Stefan Maat , Philip Milton Rice
IPC分类号： G11B5/39
CPC分类号： B82Y25/00 , B82Y10/00 , G01R33/093 , G11B5/012 , G11B5/3903 , G11B5/3967 , H01F10/3277
摘要： An exchange-coupled magnetic structure includes a ferromagnetic layer, a coercive ferrite layer, such as cobalt-ferrite, for biasing the magnetization of the ferromagnetic layer, and an oxide underlayer, such as cobalt-oxide, in proximity to the coercive ferrite layer. The oxide underlayer has a lattice structure of either rock salt or a spinel and exhibits no magnetic moment at room temperature. The underlayer affects the structure of the coercive ferrite layer and therefore its magnetic properties, providing increased coercivity and enhanced thermal stability. As a result, the coercive ferrite layer is thermally stable at much smaller thicknesses than without the underlayer. The exchange-coupled structure is used in spin valve and magnetic tunnel junction magnetoresistive sensors in read heads of magnetic disk drive systems. Because the coercive ferrite layer can be made as thin as 1 nm while remaining thermally stable, the sensor satisfies the narrow gap requirements of high recording density systems.
摘要翻译： 交换耦合磁性结构包括强磁性层，用于偏置铁磁性层的磁化的钴铁氧体的矫顽铁氧体层以及邻近矫顽铁氧体层的氧化钴底层，例如氧化钴。 氧化物底层具有岩盐或尖晶石的晶格结构，并且在室温下不显示磁矩。 底层影响矫顽铁氧体层的结构，因此影响其磁特性，提供增强的矫顽力和增强的热稳定性。 结果，矫顽铁氧体层的热稳定性比没有底层要小得多的厚度。 交换耦合结构用于磁盘驱动系统读磁头中的自旋阀和磁隧道结磁阻传感器。 由于矫顽铁氧体层可以制成1nm的薄而保持热稳定性，所以传感器满足高记录密度系统的窄间隙要求。
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9.发明授权Disk drive with laminated magnetic thin films with sublayers for magnetic recording 有权具有层叠磁性薄膜的磁盘驱动器，具有用于磁记录的子层公开(公告)号：US07976964B2
公开(公告)日：2011-07-12
申请号：US11084402
申请日：2005-03-18
IPC分类号： G11B5/66
摘要： The invention includes a disk drive with a magnetic recording disk with an upper and lower sublayer in at least one magnetic layer of a laminated magnetic layer structure that includes a spacer layer that substantially decouples the magnetic layers. The lower sublayer has a lower boron content than the upper sublayer and a preferred embodiment is CoPtCrBTa. The upper sublayer is deposited onto the lower sublayer and is preferably CoPtCrB with a higher boron content than the lower sublayer. The composition of the lower sublayer gives it a very low moment with low intrinsic coercivity which would not be useful as a recording layer on its own. The upper sublayer is a higher moment alloy with high intrinsic coercivity. An embodiment of the invention includes a laminated magnetic layer structure which is antiferromagnetically coupled to a lower ferromagnetic layer.
摘要翻译： 本发明包括具有磁记录盘的磁盘驱动器，该磁盘驱动器具有在层叠磁性层结构的至少一个磁性层中具有上和下子层的磁记录盘，该磁层包括使磁性层基本上分离的间隔层。 下层具有比上层更低的硼含量，优选实施方案是CoPtCrBTa。 上部子层沉积在下部子层上，优选的是具有比下部子层更高的硼含量的CoPtCrB。 下层的组成使得其具有低固有矫顽力的非常低的力矩，其本身不会用作记录层。 上层是具有高固有矫顽力的较高的力矩合金。 本发明的实施例包括层叠的磁性层结构，其被反铁磁耦合到下铁磁层。
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10.发明授权Heat assisted switching in an MRAM cell utilizing the antiferromagnetic to ferromagnetic transition in FeRh 有权利用FeRh中的反铁磁性铁磁转变，在MRAM单元中进行热辅助切换公开(公告)号：US07372116B2
公开(公告)日：2008-05-13
申请号：US10869315
申请日：2004-06-16
CPC分类号： G11C11/16 , G11C11/1675
摘要： A magnetic memory cell for use in a magnetic random access memory array that uses the antiferromagnetic to ferromagnetic transition properties of FeRh to assist in the control of switching of the memory cell.
摘要翻译： 一种用于磁随机存取存储器阵列的磁存储单元，其使用FeRh的反铁磁性铁磁转变特性来协助控制存储器单元的切换。
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