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

IPC分类号： G11B5/66 ,  G11B5/706

CPC分类号： G11B5/66 ,  G11B5/65 ,  G11B5/855

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。

公开(公告)号：US06834026B2

公开(公告)日：2004-12-21

申请号：US10626362

申请日：2003-07-23

申请人： Eric E. Fullerton ,  Stefan Maat ,  Jan-Ulrich Thiele

发明人： Eric E. Fullerton ,  Stefan Maat ,  Jan-Ulrich Thiele

IPC分类号： G11B1100

CPC分类号： G11B5/66 ,  G11B5/82 ,  G11B2005/0002 ,  G11B2005/0021 ,  Y10T428/24802

摘要： A magnetic recording medium for thermally-assisted recording is a bilayer of a high-coercivity, high-anisotropy ferromagnetic material like FePt and a switching material like FeRh or Fe(RhM) (where M is Ir, Pt, Ru, Re or Os) that exhibits a switch from antiferromagnetic to ferromagnetic at a transition temperature less than the Curie temperature of the high-coercivity material. The high-coercivity recording layer and the switching layer are exchange coupled ferromagnetically when the switching layer is in its ferromagnetic state. To write data the bilayer medium is heated above the transition temperature of the switching layer. When the switching layer becomes ferromagnetic, the total magnetization of the bilayer is increased, and consequently the switching field required to reverse a magnetized bit is decreased without lowering the anisotropy of the recording layer. The magnetic bit pattern is recorded in both the recording layer and the switching layer. When the media is cooled to below the transition temperature of the switching layer, the switching layer becomes antiferromagnetic and the bit pattern remains in the high-anisotropy recording layer.

摘要翻译： 用于热辅助记录的磁记录介质是诸如FePt的高矫顽力，高各向异性铁磁材料和诸如FeRh或Fe（RhM）（其中M是Ir，Pt，Ru，Re或Os）的开关材料的双层， 其在低于高矫顽力材料的居里温度的转变温度下表现出从反铁磁转变为铁磁。 当高矫顽力记录层和开关层在开关层处于其铁磁状态时，铁磁性交换耦合。 为了写入数据，双层介质被加热到开关层的转变温度之上。 当开关层成为铁磁性时，双层的总磁化强度增加，因此在不降低记录层的各向异性的情况下降低了使磁化位反转所需的切换场。 磁记录层记录在记录层和切换层中。 当介质冷却到切换层的转变温度以下时，开关层变为反铁磁性，并且位图形保留在高各向异性记录层中。

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。

公开(公告)号：US07514162B2

公开(公告)日：2009-04-07

申请号：US11185659

申请日：2005-07-19

申请人： Andreas Klaus Berger ,  Eric E. Fullerton ,  Olav Hellwig

发明人： Andreas Klaus Berger ,  Eric E. Fullerton ,  Olav Hellwig

IPC分类号： G11B5/66 ,  G11B5/673

CPC分类号： G11B5/66 ,  G11B5/656 ,  G11B5/667 ,  G11B5/732 ,  G11B5/7325

摘要： A perpendicular magnetic recording medium includes a metamagnetic antiferromagnetically-coupled (AFC) layer between the recording layer (RL) and the soft magnetically permeable underlayer (SUL). The metamagnetic AFC layer has essentially no net magnetic moment in the absence of a magnetic field, but is highly ferromagnetic in the presence of a magnetic field above a threshold field. Thus the metamagnetic AFC layer does not contribute to the readback signal during reading, but channels the write field to the SUL during writing because the threshold field is selected to be below the write field. An exchange-break layer EBL is located between the metamagnetic AFC layer and the RL. The metamagnetic AFC layer contains films with a crystalline structure suitable as a growth template for the EBL and RL, so the metamagnetic AFC layer also functions as part of an “effective EBL”, thereby allowing the actual EBL to be made as thin as possible.

摘要翻译： 垂直磁记录介质包括在记录层（RL）和软磁性可渗透底层（SUL）之间的超磁性反铁磁耦合（AFC）层。 在没有磁场的情况下，超磁性AFC层基本上没有净磁矩，但是在存在超过阈值场的磁场的情况下是高铁磁性的。 因此，偏磁AFC层在读取期间不对回读信号有贡献，而是在写入期间将写入场指向SUL，因为阈值域被选择为低于写入场。 交换断层EBL位于超磁性AFC层和RL之间。 超磁性AFC层含有具有适合于EBL和RL的生​​长模板的晶体结构的膜，因此，反磁性AFC层也起到“有效EBL”的一部分的作用，从而使实际的EBL尽可能薄。

公开(公告)号：US07488545B2

公开(公告)日：2009-02-10

申请号：US11403468

申请日：2006-04-12

申请人： Eric E. Fullerton ,  David Margulies ,  Hal J. Rosen ,  Natacha F. Supper

发明人： Eric E. Fullerton ,  David Margulies ,  Hal J. Rosen ,  Natacha F. Supper

IPC分类号： G11B5/66

CPC分类号： G11B5/66 ,  G11B5/65

摘要： A laminated perpendicular magnetic recording medium has two recording layers (RL1 and RL2) that are separated and magnetically decoupled by a nonmagnetic spacer layer (SL). The SL has a thickness and composition to assure there is no antiferromagnetic or ferromagnetic coupling between RL1 and RL2. Thus in the presence of the write field, RL1 and RL2 respond independently and become oriented with the direction of the write field. Each RL is an “exchange-spring” type magnetic recording layer formed of two ferromagnetic layers (MAG1 and MAG2) that have substantially perpendicular magnetic anisotropy and are ferromagnetically exchange-coupled by a nonmagnetic or weakly ferromagnetic coupling layer (CL). The medium takes advantage of lamination to attain higher signal-to-noise ratio (SNR) yet has improved writability as a result of each RL being an exchange-spring type RL.

摘要翻译： 层叠的垂直磁记录介质具有被非磁性间隔层（SL）分离并磁解除的两个记录层（RL1和RL2）。 SL具有厚度和组成，以确保在RL1和RL2之间不存在反铁磁或铁磁耦合。 因此，在存在写入场的情况下，RL1和RL2独立地响应并且随着写入场的方向而取向。 每个RL是由两个铁磁层（MAG1和MAG2）形成的“交换弹簧”型磁记录层，它们具有基本上垂直的磁各向异性，并通过非磁性或弱铁磁耦合层（CL）进行铁磁交换耦合。 介质利用层叠来获得更高的信噪比（SNR），而由于每个RL是交换弹簧型RL，所以具有改进的可写性。

公开(公告)号：US20080261078A1

公开(公告)日：2008-10-23

申请号：US11736525

申请日：2007-04-17

申请人： Andreas Klaus Berger ,  Eric E. Fullerton ,  Byron Hassberg Lengsfield ,  David Thomas Margulies

发明人： Andreas Klaus Berger ,  Eric E. Fullerton ,  Byron Hassberg Lengsfield ,  David Thomas Margulies

IPC分类号： G11B5/33

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（MAG 1和MAG 2）组成，每个具有垂直的磁各向异性。 MAG 1和MAG 2可以具有位于它们之间的耦合层（CL），其允许MAG 1与MAG 2的铁磁交换耦合。 LCL位于MAG 1上方或下方，并与MAG 1直接接触，并介导MAG 1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的大体分离和去耦晶粒的边界，并且LCL和MAG1晶粒被垂直强耦合，所以LCL在MAG 1中引入有效的晶间交换耦合。

公开(公告)号：US06567236B1

公开(公告)日：2003-05-20

申请号：US10010785

申请日：2001-11-09

申请人： Mary Frances Doerner ,  Eric E. Fullerton ,  David T. Margulies ,  Kai Tang

发明人： Mary Frances Doerner ,  Eric E. Fullerton ,  David T. Margulies ,  Kai Tang

IPC分类号： G11B566

CPC分类号： B82Y25/00 ,  G11B5/012 ,  G11B5/66 ,  G11B5/732 ,  G11B5/7325 ,  G11B2005/001 ,  H01F10/3218 ,  H01F10/3295 ,  Y10S428/90 ,  Y10T428/1107 ,  Y10T428/12465 ,  Y10T428/12847 ,  Y10T428/12861 ,  Y10T428/24942 ,  Y10T428/24975

摘要： An antiferromagnetically coupled layer structure for magnetic recording wherein the top ferromagnetic structure is a bilayer structure including a relatively thin first sublayer of ferromagnetic material in contact with the coupling/spacer layer. The first sublayer has a higher magnetic moment than the second sublayer. The layer structure of the invention results improved manufacturability and improved performance. A preferred embodiment of a layer structure according to the invention includes: a bottom ferromagnetic layer preferably of CoCr; an antiferromagnetic coupling/spacer layer preferably of Ru; and a top ferromagnetic structure including a thin first sublayer of material preferably of CoCr, CoCrB or CoPtCrB, and a thicker second sublayer of material preferably of CoPtCrB with a lower moment than the first sublayer.

摘要翻译： 一种用于磁记录的反铁磁耦合层结构，其中顶部铁磁结构是包括与耦合/间隔层接触的铁磁材料的相对薄的第一子层的双层结构。 第一子层具有比第二子层更高的磁矩。 本发明的层结构提高了可制造性和改进的性能。 根据本发明的层结构的优选实施例包括：优选CoCr的底部铁磁层; 优选Ru的反铁磁耦合/间隔层; 以及包括优选CoCr，CoCrB或CoPtCrB的材料的薄的第一子层以及具有比第一子层更低的力矩的较厚的CoPtCrB材料的较厚的第二子层的顶部铁磁结构。

公开(公告)号：US20100110581A1

公开(公告)日：2010-05-06

申请号：US12687187

申请日：2010-01-14

申请人： Eric E. Fullerton ,  Olav Hellwig

发明人： Eric E. Fullerton ,  Olav Hellwig

IPC分类号： G11B21/02

CPC分类号： G11B5/65 ,  G11B5/66 ,  G11B5/667 ,  G11B5/7325 ,  G11B5/855

摘要： A magnetic recording disk drive has a patterned perpendicular magnetic recording disk of the type that has spaced-apart pillars with magnetic material on their ends and with trenches between the pillars that are nonmagnetic regions. A nonmagnetic capping layer is located in the trenches above the nonmagnetic regions. The substrate has diffusion material in the trenches that when heated will diffuse into the magnetic recording layer material and chemically react with it. The pillars are formed of material that will not diffuse into the recording layer. The recording layer is formed over the entire substrate and a nonmagnetic capping layer that is not chemically reactive with the diffusion material is formed over the recording layer in the trenches. The substrate is annealed to cause the recording layer material in the trenches and the material in the substrate to diffuse into one another and chemically react to render the trenches nonmagnetic. The capping layer suppresses the diffusion of material from the substrate to the surface in the trenches and thus prevents migration of diffusion material to the recording layer material on the ends of the pillars.

摘要翻译： 磁记录盘驱动器具有图案化的垂直磁记录盘，其具有在其端部上具有磁性材料的间隔开的柱，并且在作为非磁性区域的柱之间的沟槽。 非磁性覆盖层位于非磁性区域上方的沟槽中。 衬底在沟槽中具有扩散材料，当加热时扩散材料将扩散到磁记录层材料中并与其发生化学反应。 支柱由不会扩散到记录层中的材料形成。 记录层形成在整个基板上，并且在沟槽中的记录层上形成与扩散材料不具有化学反应性的非磁性覆盖层。 将衬底退火以使沟槽中的记录层材料和衬底中的材料彼此扩散并进行化学反应以使沟槽成为非磁性的。 覆盖层抑制材料从衬底到沟槽表面的扩散，从而防止扩散材料向支柱端部的记录层材料迁移。

公开(公告)号：US07670696B2

公开(公告)日：2010-03-02

申请号：US11743140

申请日：2007-05-01

申请人： Eric E. Fullerton ,  Olav Hellwig

发明人： Eric E. Fullerton ,  Olav Hellwig

IPC分类号： G11B5/66

CPC分类号： G11B5/65 ,  G11B5/66 ,  G11B5/667 ,  G11B5/7325 ,  G11B5/855

摘要： A patterned perpendicular magnetic recording medium of the type that has spaced-apart pillars with magnetic material on their ends and with trenches between the pillars that are nonmagnetic regions is made with a method that allows use of a pre-etched substrate. A nonmagnetic capping layer is located in the trenches above the nonmagnetic regions. The substrate has diffusion material in the trenches that when heated will diffuse into the magnetic recording layer material and chemically react with it. The pillars are formed of material that will not diffuse into the recording layer. The recording layer is formed over the entire substrate and a nonmagnetic capping layer that is not chemically reactive with the diffusion material is formed over the recording layer in the trenches. The substrate is annealed to cause the recording layer material in the trenches and the material in the substrate to diffuse into one another and chemically react to render the trenches nonmagnetic. The capping layer suppresses the diffusion of material from the substrate to the surface in the trenches and thus prevents migration of diffusion material to the recording layer material on the ends of the pillars.

摘要翻译： 具有在其端部上具有磁性材料的间隔开的柱和在非磁性区域之间的柱之间的沟槽的类型的垂直磁记录介质是通过允许使用预蚀刻的衬底的方法制成的。 非磁性覆盖层位于非磁性区域上方的沟槽中。 衬底在沟槽中具有扩散材料，当加热时扩散材料将扩散到磁记录层材料中并与其发生化学反应。 支柱由不会扩散到记录层中的材料形成。 记录层形成在整个基板上，并且在沟槽中的记录层上形成与扩散材料不具有化学反应性的非磁性覆盖层。 将衬底退火以使沟槽中的记录层材料和衬底中的材料彼此扩散并进行化学反应以使沟槽成为非磁性的。 覆盖层抑制材料从衬底到沟槽表面的扩散，从而防止扩散材料向支柱端部的记录层材料迁移。