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1.发明授权Perpendicular magnetic recording medium with multiple exchange-coupled magnetic layers having substantially similar anisotropy fields 有权具有多个具有基本相似的各向异性场的交换耦合磁性层的垂直磁记录介质公开(公告)号：US07550210B2
公开(公告)日：2009-06-23
申请号：US11372295
申请日：2006-03-09
申请人： Andreas Klaus Berger , Hoa Van Do , Eric E. Fullerton , Yoshihiro Ikeda , Byron Hassberg Lengsfield, III , Natacha F. Supper
发明人： Andreas Klaus Berger , Hoa Van Do , Eric E. Fullerton , Yoshihiro Ikeda , Byron Hassberg Lengsfield, III , Natacha F. Supper
IPC分类号： G11B5/66
CPC分类号： G11B5/66
摘要： A perpendicular magnetic recording medium has an “exchange-spring” type magnetic recording layer (RL) formed of two ferromagnetic layers with substantially similar anisotropy fields that are ferromagnetically exchange-coupled by a nonmagnetic or weakly ferromagnetic coupling layer. Because the write head produces a larger magnetic field and larger field gradient at the upper portion of the RL, while the field strength decreases further inside the RL, the upper ferromagnetic layer can have a high anisotropy field. The high field and field gradient near the top of the RL, where the upper ferromagnetic layer is located, reverses the magnetization of the upper ferromagnetic layer, which then assists in the magnetization reversal of the lower ferromagnetic layer. Because both ferromagnetic layers in this exchange-spring type RL have a high anisotropy field, the thermal stability of the medium is not compromised. The medium shows improved writability, i.e., a low switching field, as well as lower intrinsic media noise, over a medium with a conventional single-layer RL.
摘要翻译： 垂直磁记录介质具有由具有基本相似的各向异性场的两个铁磁层形成的“交换弹簧”型磁记录层（RL），其通过非磁性或弱铁磁耦合层进行铁磁交换耦合。 由于写头在RL的上部产生较大的磁场和较大的场梯度，而在RL内的场强进一步降低，所以上铁磁层可以具有高的各向异性场。 在RL的顶部附近的高场磁场梯度，其中上铁磁层位于其上，反转上铁磁层的磁化，其随后有助于下铁磁层的磁化反转。 由于这种交换弹簧型RL中的两个铁磁层具有高各向异性场，所以介质的热稳定性不受影响。 在具有常规单层RL的介质上，介质显示改进的可写性，即低切换场，以及较低的固有介质噪声。
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2.发明授权公开(公告)号：US07582368B2
公开(公告)日：2009-09-01
申请号：US11532055
申请日：2006-09-14
IPC分类号： G11B5/66
摘要： A perpendicular magnetic recording system and medium has a multilayered recording layer that includes an exchange-spring structure and a ferromagnetic lateral coupling layer (LCL). The exchange-spring structure is made up of two ferromagnetically exchange-coupled magnetic layers (MAG1 and MAG2), each with perpendicular magnetic anisotropy. MAG1 and MAG2 are either in direct contact with one another or have a coupling layer (CL) located between them. The LCL is located in direct contact with MAG2 and mediates intergranular exchange coupling in MAG2. The ferromagnetic alloy in the LCL has significantly greater intergranular exchange coupling than the ferromagnetic alloy in MAG2, which typically will include segregants such as oxides. The LCL is preferably free of oxides or other segregants, which would tend to reduce intergranular exchange coupling in the LCL. Because the LCL grain boundaries overlay the boundaries of the generally segregated and decoupled grains of MAG2, and the LCL and MAG2 grains are strongly coupled perpendicularly, the LCL introduces an effective intergranular exchange coupling in the MAG2.
摘要翻译： 垂直磁记录系统和介质具有包括交换弹簧结构和铁磁横向耦合层（LCL）的多层记录层。 交换弹簧结构由两个铁磁交换磁性层（MAG1和MAG2）组成，每个具有垂直的磁各向异性。 MAG1和MAG2彼此直接接触或者位于它们之间的耦合层（CL）。 LCL与MAG2直接接触并介导MAG2中的晶间交换耦合。 LCL中的铁磁合金具有比MAG2中的铁磁合金明显更大的晶间交换耦合，其通常将包括分离子如氧化物。 LCL优选不含氧化物或其它分离剂，其倾向于降低LCL中的晶间交换偶联。 因为LCL晶界覆盖了MAG2的大致分离和去耦晶粒的边界，并且LCL和MAG2晶粒垂直强耦合，所以LCL在MAG2中引入有效的晶间交换耦合。
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3.发明授权公开(公告)号：US07846563B2
公开(公告)日：2010-12-07
申请号：US12534181
申请日：2009-08-03
申请人： Andreas Klaus Berger , Eric E. Fullerton , Byron Hassberg Lengsfield, III , David Thomas Margulies
发明人： Andreas Klaus Berger , Eric E. Fullerton , Byron Hassberg Lengsfield, III , David Thomas Margulies
CPC分类号： G11B5/82 , G11B5/02 , G11B5/66 , G11B2005/0005 , G11B2005/0029
摘要： A perpendicular magnetic recording system and medium has a multilayered recording layer that includes an exchange-spring structure and a ferromagnetic lateral coupling layer (LCL). The exchange-spring structure is made up of two ferromagnetically exchange-coupled magnetic layers (MAG1 and MAG2), each with perpendicular magnetic anisotropy. MAG1 and MAG2 may have a coupling layer (CL) located between them that permits ferromagnetic exchange coupling of MAG1 with MAG2. The LCL is located either above or below MAG1 and in direct contact with MAG1 and mediates an effective intergranular exchange coupling in MAG1. The ferromagnetic alloy in the LCL has significantly greater intergranular exchange coupling than the ferromagnetic alloy in MAG1, which typically will include segregants such as oxides. The LCL is preferably free of oxides or other non-metallic segregants, which would tend to reduce intergranular exchange coupling in the LCL. Because the LCL grain boundaries overlay the boundaries of the generally segregated and decoupled grains of MAG1, and the LCL and MAG1 grains are strongly coupled perpendicularly, the LCL introduces an effective intergranular exchange coupling in the MAG1.
摘要翻译： 垂直磁记录系统和介质具有包括交换弹簧结构和铁磁横向耦合层（LCL）的多层记录层。 交换弹簧结构由两个铁磁交换磁性层（MAG1和MAG2）组成，每个具有垂直的磁各向异性。 MAG1和MAG2可以具有位于它们之间的耦合层（CL），其允许MAG1与MAG2的铁磁交换耦合。 LCL位于MAG1上方或下方，与MAG1直接接触，并介导MAG1中有效的晶间交换耦合。 LCL中的铁磁合金具有比MAG1中的铁磁合金显着更大的晶间交换耦合，其通常将包括分离子如氧化物。 LCL优选不含氧化物或其它非金属分离剂，其倾向于减少LCL中的晶间交换偶联。 因为LCL晶界覆盖了MAG1的大致分离和去耦晶粒的边界，并且LCL和MAG1晶粒垂直强耦合，所以LCL在MAG1中引入有效的晶间交换耦合。
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4.发明申请公开(公告)号：US20080292907A1
公开(公告)日：2008-11-27
申请号：US11751823
申请日：2007-05-22
申请人： Andreas Klaus Berger , Eric E. Fullerton , Olav Hellwig , Byron Hassberg Lengsfield, III , Ernesto E. Marinero
发明人： Andreas Klaus Berger , Eric E. Fullerton , Olav Hellwig , Byron Hassberg Lengsfield, III , Ernesto E. Marinero
摘要： A patterned perpendicular magnetic recording medium has discrete magnetic islands, each of which has a recording layer (RL) structure that comprises two exchange-coupled ferromagnetic layers. The RL structure may be an “exchange-spring” RL structure with an upper ferromagnetic layer (MAG2), sometimes called the exchange-spring layer (ESL), ferromagnetically coupled to a lower ferromagnetic layer (MAG1), sometimes called the media layer (ML). The RL structure may also include a coupling layer (CL) between MAG1 and MAG2 that permits ferromagnetic coupling. The interlayer exchange coupling between MAG1 and MAG2 may be optimized, in part, by adjusting the materials and thickness of the CL. The RL structure may also include a ferromagnetic lateral coupling layer (LCL) that is in contact with at least one of MAG1 and MAG2 for mediating intergranular exchange coupling in the ferromagnetic layer or layers with which it is in contact (MAG2 or MAG1). The ferromagnetic alloy in the LCL has significantly greater intergranular exchange coupling than the ferromagnetic alloy with which it is in contact (MAG2 or MAG1).
摘要翻译： 图案化的垂直磁记录介质具有离散的磁岛，每个磁岛具有包含两个交换耦合的铁磁层的记录层（RL）结构。 RL结构可以是具有上铁磁层（MAG2）的“交换弹簧”RL结构，有时称为交换弹簧层（ESL），铁磁耦合到下铁磁层（MAG1），有时称为介质层 ML）。 RL结构还可以包括允许铁磁耦合的MAG1和MAG2之间的耦合层（CL）。 可以通过调整CL的材料和厚度来部分地优化MAG1和MAG2之间的层间交换耦合。 RL结构还可以包括与MAG1和MAG2中的至少一个接触的铁磁侧向耦合层（LCL），用于介导与其接触的铁磁层（MAG2或MAG1）中的晶间交换耦合。 LCL中的铁磁合金与其接触的铁磁合金（MAG2或MAG1）具有明显更大的晶间交换耦合。
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5.发明授权Patterned perpendicular magnetic recording medium with exchange coupled recording layer structure and magnetic recording system using the medium 有权具有交换耦合记录层结构的图案垂直磁记录介质和使用介质的磁记录系统公开(公告)号：US08021769B2
公开(公告)日：2011-09-20
申请号：US11751823
申请日：2007-05-22
申请人： Andreas Klaus Berger , Eric E. Fullerton , Olav Hellwig , Byron Hassberg Lengsfield, III , Ernesto E. Marinero
发明人： Andreas Klaus Berger , Eric E. Fullerton , Olav Hellwig , Byron Hassberg Lengsfield, III , Ernesto E. Marinero
IPC分类号： G11B5/66
摘要： A patterned perpendicular magnetic recording medium has discrete magnetic islands, each of which has a recording layer (RL) structure that comprises two exchange-coupled ferromagnetic layers. The RL structure may be an “exchange-spring” RL structure with an upper ferromagnetic layer (MAG2), sometimes called the exchange-spring layer (ESL), ferromagnetically coupled to a lower ferromagnetic layer (MAG1), sometimes called the media layer (ML). The RL structure may also include a coupling layer (CL) between MAG1 and MAG2 that permits ferromagnetic coupling. The interlayer exchange coupling between MAG1 and MAG2 may be optimized, in part, by adjusting the materials and thickness of the CL. The RL structure may also include a ferromagnetic lateral coupling layer (LCL) that is in contact with at least one of MAG1 and MAG2 for mediating intergranular exchange coupling in the ferromagnetic layer or layers with which it is in contact (MAG2 or MAG1). The ferromagnetic alloy in the LCL has significantly greater intergranular exchange coupling than the ferromagnetic alloy with which it is in contact (MAG2 or MAG1).
摘要翻译： 图案化的垂直磁记录介质具有离散的磁岛，每个磁岛具有包含两个交换耦合的铁磁层的记录层（RL）结构。 RL结构可以是具有上铁磁层（MAG2）的“交换弹簧”RL结构，有时称为交换弹簧层（ESL），铁磁耦合到下铁磁层（MAG1），有时称为介质层 ML）。 RL结构还可以包括允许铁磁耦合的MAG1和MAG2之间的耦合层（CL）。 可以通过调整CL的材料和厚度来部分地优化MAG1和MAG2之间的层间交换耦合。 RL结构还可以包括与MAG1和MAG2中的至少一个接触的铁磁侧向耦合层（LCL），用于介导与其接触的铁磁层（MAG2或MAG1）中的晶间交换耦合。 LCL中的铁磁合金与其接触的铁磁合金（MAG2或MAG1）具有明显更大的晶间交换耦合。
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6.发明授权公开(公告)号：US07588841B2
公开(公告)日：2009-09-15
申请号：US11736525
申请日：2007-04-17
申请人： Andreas Klaus Berger , Eric E. Fullerton , Byron Hassberg Lengsfield, III , David Thomas Margulies
发明人： Andreas Klaus Berger , Eric E. Fullerton , Byron Hassberg Lengsfield, III , David Thomas Margulies
IPC分类号： G11B5/66
CPC分类号： G11B5/82 , G11B5/02 , G11B5/66 , G11B2005/0005 , G11B2005/0029
摘要： A perpendicular magnetic recording system and medium has a multilayered recording layer that includes an exchange-spring structure and a ferromagnetic lateral coupling layer (LCL). The exchange-spring structure is made up of two ferromagnetically exchange-coupled magnetic layers (MAG1 and MAG2), each with perpendicular magnetic anisotropy. MAG1 and MAG2 may have a coupling layer (CL) located between them that permits ferromagnetic exchange coupling of MAG1 with MAG2. The LCL is located either above or below MAG1 and in direct contact with MAG1 and mediates an effective intergranular exchange coupling in MAG1. The ferromagnetic alloy in the LCL has significantly greater intergranular exchange coupling than the ferromagnetic alloy in MAG1, which typically will include segregants such as oxides. The LCL is preferably free of oxides or other non-metallic segregants, which would tend to reduce intergranular exchange coupling in the LCL. Because the LCL grain boundaries overlay the boundaries of the generally segregated and decoupled grains of MAG1, and the LCL and MAG1 grains are strongly coupled perpendicularly, the LCL introduces an effective intergranular exchange coupling in the MAG1.
摘要翻译： 垂直磁记录系统和介质具有包括交换弹簧结构和铁磁横向耦合层（LCL）的多层记录层。 交换弹簧结构由两个铁磁交换磁性层（MAG1和MAG2）组成，每个具有垂直的磁各向异性。 MAG1和MAG2可以具有位于它们之间的耦合层（CL），其允许MAG1与MAG2的铁磁交换耦合。 LCL位于MAG1上方或下方，与MAG1直接接触，并介导MAG1中有效的晶间交换耦合。 LCL中的铁磁合金具有比MAG1中的铁磁合金明显更大的晶间交换耦合，其通常将包括分离子如氧化物。 LCL优选不含氧化物或其它非金属分离剂，其倾向于减少LCL中的晶间交换偶联。 因为LCL晶界覆盖了MAG1的大致分离和去耦晶粒的边界，并且LCL和MAG1晶粒垂直强耦合，所以LCL在MAG1中引入有效的晶间交换耦合。
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7.发明申请公开(公告)号：US20090290256A1
公开(公告)日：2009-11-26
申请号：US12534181
申请日：2009-08-03
申请人： Andreas Klaus Berger , Eric E. Fullerton , Byron Hassberg Lengsfield, III , David Thomas Margulies
发明人： Andreas Klaus Berger , Eric E. Fullerton , Byron Hassberg Lengsfield, III , David Thomas Margulies
CPC分类号： G11B5/82 , G11B5/02 , G11B5/66 , G11B2005/0005 , G11B2005/0029
摘要： A perpendicular magnetic recording system and medium has a multilayered recording layer that includes an exchange-spring structure and a ferromagnetic lateral coupling layer (LCL). The exchange-spring structure is made up of two ferromagnetically exchange-coupled magnetic layers (MAG1 and MAG2), each with perpendicular magnetic anisotropy. MAG1 and MAG2 may have a coupling layer (CL) located between them that permits ferromagnetic exchange coupling of MAG1 with MAG2. The LCL is located either above or below MAG1 and in direct contact with MAG1 and mediates an effective intergranular exchange coupling in MAG1. The ferromagnetic alloy in the LCL has significantly greater intergranular exchange coupling than the ferromagnetic alloy in MAG1, which typically will include segregants such as oxides. The LCL is preferably free of oxides or other non-metallic segregants, which would tend to reduce intergranular exchange coupling in the LCL. Because the LCL grain boundaries overlay the boundaries of the generally segregated and decoupled grains of MAG1, and the LCL and MAG1 grains are strongly coupled perpendicularly, the LCL introduces an effective intergranular exchange coupling in the MAG1.
摘要翻译： 垂直磁记录系统和介质具有包括交换弹簧结构和铁磁横向耦合层（LCL）的多层记录层。 交换弹簧结构由两个铁磁交换磁性层（MAG1和MAG2）组成，每个具有垂直的磁各向异性。 MAG1和MAG2可以具有位于它们之间的耦合层（CL），其允许MAG1与MAG2的铁磁交换耦合。 LCL位于MAG1上方或下方，与MAG1直接接触，并介导MAG1中有效的晶间交换耦合。 LCL中的铁磁合金具有比MAG1中的铁磁合金显着更大的晶间交换耦合，其通常将包括分离子如氧化物。 LCL优选不含氧化物或其它非金属分离剂，其倾向于减少LCL中的晶间交换偶联。 因为LCL晶界覆盖了MAG1的大致分离和去耦晶粒的边界，并且LCL和MAG1晶粒垂直强耦合，所以LCL在MAG1中引入有效的晶间交换耦合。
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8.发明授权Perpendicular magnetic recording medium with exchange-spring structure having multiple exchange-spring layers and recording system for the medium 失效具有交换弹簧结构的垂直磁记录介质具有多个交换弹簧层和用于介质的记录系统公开(公告)号：US07572526B2
公开(公告)日：2009-08-11
申请号：US11676299
申请日：2007-02-18
CPC分类号： G11B5/66
摘要： A perpendicular magnetic recording system uses an exchange-spring type of perpendicular magnetic recording medium. The medium has a recording layer (RL) that includes a lower media layer (ML) and a multilayer exchange-spring layer (ESL) above the ML. The high anisotropy field (high-Hk) lower ML and the multilayer ESL are exchange-coupled across a coupling layer. The multilayer ESL has at least two ESLs separated by a coupling layer, with each of the ESLs having an Hk substantially less than the Hk of the ML. The exchange-spring structure with the multilayer ESL takes advantage of the fact that the write field magnitude and write field gradient vary as a function of distance from the write pole. The thicknesses and Hk values of each of the ESLs can be independently varied to optimize the overall recording performance of the medium.
摘要翻译： 垂直磁记录系统使用交换弹簧式垂直磁记录介质。 介质具有记录层（RL），其包括ML上方的下介质层（ML）和多层交换弹簧层（ESL）。 高各向异性场（high-Hk）较低的ML和多层ESL在耦合层之间交换耦合。 多层ESL具有由耦合层隔开的至少两个ESL，每个ESL具有基本上小于ML的Hk的Hk。 具有多层ESL的交换弹簧结构利用写入场幅度和写场梯度随着与写入极的距离的函数而变化的优点。 可以独立地改变每个ESL的厚度和H k值以优化介质的整体记录性能。
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9.发明申请DISCRETE TRACK MEDIA WITH A CAPPED MEDIA STRUCTURE HAVING HIGH MOMENT AND EXCHANGE 审中-公开具有高转移和交换的CAPPED媒体结构的离散跟踪媒体公开(公告)号：US20090155627A1
公开(公告)日：2009-06-18
申请号：US11956389
申请日：2007-12-14
申请人： Andreas Klaus Berger , Eric Edward Fullerton , Byron Hassberg Lengsfield, III , James Terrence Olson
发明人： Andreas Klaus Berger , Eric Edward Fullerton , Byron Hassberg Lengsfield, III , James Terrence Olson
CPC分类号： G11B5/66
摘要： A media architecture is optimized for discrete track recording. A capped or exchange-spring media uses a thin media structure and incorporates higher moment density magnetic layers. A thin exchange coupling layer is used in conjunction with a cap layer to control the reversal mechanism and exchange. Thus, the exchange coupling layer mediates the interaction between the two outer magnetic layers. The thickness of the exchange coupling layer is tuned by monitoring the media signal-to-noise ratio, track width and bit error rate. The recording performance is enhanced by tuning the intergranular exchange in the system through the use of the high-moment cap as writeability, resolution and noise are improved.
摘要翻译： 媒体架构针对离散轨道记录进行了优化。 封盖或交换弹簧介质使用薄介质结构并且结合较高的力矩密度磁层。 薄交换耦合层与盖层结合使用以控制反转机制和交换。 因此，交换耦合层介导两个外磁层之间的相互作用。 通过监测介质信噪比，轨道宽度和误码率来调整交换耦合层的厚度。 通过使用高功率上限作为可写性来调整系统中的晶间交换，提高了记录性能，提高了分辨率和噪声。
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10.发明授权Perpendicular magnetic recording medium with improved antiferromagnetically-coupled recording layer 有权具有改进的反铁磁耦合记录层的垂直磁记录介质公开(公告)号：US07572527B2
公开(公告)日：2009-08-11
申请号：US11135703
申请日：2005-05-24
IPC分类号： G11B5/66
CPC分类号： G11B5/66 , G11B5/656 , G11B5/667 , G11B5/7325
摘要： A perpendicular magnetic recording disk has an antiferromagnetically-coupled (AFC) recording layer (RL) comprised of lower and upper ferromagnetic layers, each having a hexagonal-close-packed (hcp) crystalline structure and perpendicular magnetic anisotropy, separated by an antiferromagnetically (AF) coupling layer, wherein the lower ferromagnetic layer (LFM) has substantially higher magnetic permeability than the upper ferromagnetic layer (UFM). The AFC RL is located on an actual exchange break layer (EBL) that separates the AFC RL from the disk's soft magnetic underlayer (SUL). The LFM functions as part of an “effective” exchange break layer (EBL) that also includes the actual EBL and the AF-coupling layer, thereby allowing the actual EBL to be made as thin as possible. The hcp LFM promotes the growth of the hcp UFM in the same way the actual EBL does so that its thickness contributes to the thickness necessary to grow the hcp UFM. The effective EBL appears to be magnetically “thin” during the write process and magnetically “thick” during the readback process.
摘要翻译： 垂直磁记录盘具有由下铁磁层和上铁磁层组成的反铁磁耦合（AFC）记录层（RL），每个具有六方密堆积（hcp）晶体结构和垂直磁各向异性，由反铁磁（AF ）耦合层，其中下铁磁层（LFM）具有比上铁磁层（UFM）显着更高的磁导率。 AFC RL位于将AFC RL与磁盘的软磁底层（SUL）分离的实际交换中断层（EBL）上。 LFM作为“有效”交换中断层（EBL）的一部分，该层还包括实际的EBL和AF耦合层，从而使实际的EBL尽可能薄。 hcp LFM以与实际EBL相同的方式促进hcp UFM的增长，使其厚度有助于生长hcp UFM所需的厚度。 在写入过程中，有效的EBL看似磁性很薄，在回读过程中磁性“厚”。
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