公开(公告)号：US08748018B2

公开(公告)日：2014-06-10

申请号：US12577344

申请日：2009-10-12

Applicant: Thomas Hauet ,  Olav Hellwig ,  Kentaro Takano

Inventor： Thomas Hauet ,  Olav Hellwig ,  Kentaro Takano

IPC: G11B5/66

CPC classification number: G11B5/855 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/66 ,  G11B5/7325 ,  G11B5/746 ,  G11B5/82

Abstract: A patterned perpendicular magnetic recording medium, such as a disk for use in hard disk drives, has a flux channeling layer (FCL) located below the recording layer (RL) in each of the discrete data islands. The disk includes a substrate, a soft underlayer (SUL) of soft magnetically permeable material on the substrate, and a nonmagnetic exchange break layer (EBL) on the SUL. A nonmagnetic separation layer (SL) is located between the FCL and the RL in the islands. The FCL has an anisotropy field substantially lower than the anisotropy field of the RL, and a magnetization equal to or higher than the magnetization of the RL. The FCL is saturated at a much lower field than the RL and thus channels the magnetic flux from the write head through the island positions. The dipolar fields from the RL above the FCL polarize the magnetization of the FCL parallel to the magnetization direction of the RL in the absence of an external field, to thereby enhance the readback signal.

Abstract translation: 图形化的垂直磁记录介质，例如用于硬盘驱动器的盘，在每个离散数据岛中具有位于记录层（RL）下方的通量沟道层（FCL）。 盘包括衬底，衬底上的柔软的可渗透材料的软底层（SUL）和SUL上的非磁性交换断裂层（EBL）。 非磁性分离层（SL）位于FCL和岛之间的RL之间。 FCL具有大大低于RL的各向异性场的各向异性场，以及等于或高于RL的磁化强度的磁化强度。 FCL在比RL低得多的场处饱和，从而将来自写入头的磁通量通过岛位置。 来自FCL以上的RL的偶极场在没有外部场的情况下使FCL的磁化平行于RL的磁化方向偏振，从而增强回读信号。

公开(公告)号：US20130084387A1

公开(公告)日：2013-04-04

申请号：US13248086

申请日：2011-09-29

Applicant: Olav Hellwig ,  Jeffrey S. Lille ,  Andrew Thomas McCallum ,  Oleksandr Mosendz ,  Dieter K. Weller

Inventor： Olav Hellwig ,  Jeffrey S. Lille ,  Andrew Thomas McCallum ,  Oleksandr Mosendz ,  Dieter K. Weller

IPC: G11B5/84 ,  G11B5/851

CPC classification number: G11B5/855

Abstract: A method for making a bit-patterned-media (BPM) magnetic recording disk includes depositing a FePt (or CoPt) alloy recording layer, and then depositing a sealing layer on the FePt layer before high-temperature annealing. The high-temperature annealing causes the FePt to become substantially chemically-ordered in the L10 phase. After annealing, the sealing layer is removed. The sealing layer prevents nanoclustering and agglomeration of the FePt material at the surface of the FePt layer and the sealing layer, which would result in undesirable high surface roughness of the FePt, making patterning of the FePt layer difficult. The FePt layer can be patterned into the discrete islands for the BPM disk either before deposition of the sealing layer or after deposition and removal of the sealing layer. After patterning and removal of the sealing layer, the disk protective overcoat is deposited over the discrete data islands.

Abstract translation: 一种制造位图形介质（BPM）磁记录盘的方法包括沉积FePt（或CoPt）合金记录层，然后在高温退火之前在FePt层上沉积密封层。 高温退火使FePt在L10相中变得基本化学排序。 退火后，去除密封层。 密封层防止FePt材料在FePt层和密封层的表面的纳米聚集和聚集，这将导致FePt的不希望的高表面粗糙度，使得FePt层的图案化变得困难。 在沉积密封层之前或在沉积和去除密封层之后，FePt层可以被图案化成用于BPM盘的离散岛。 在图案化和去除密封层之后，盘保护外涂层沉积在离散的数据岛上。

公开(公告)号：US20120236694A1

公开(公告)日：2012-09-20

申请号：US13049124

申请日：2011-03-16

Applicant: Olav Hellwig ,  Ernesto E. Marinero ,  Dieter K. Weller

Inventor： Olav Hellwig ,  Ernesto E. Marinero ,  Dieter K. Weller

IPC: G11B11/00 ,  G11B5/127 ,  G11B5/82 ,  G11B5/667 ,  G11B5/73

CPC classification number: G11B5/746 ,  G11B5/7325 ,  G11B5/855

Abstract: A patterned perpendicular magnetic recording disk has a Co-alloy recording layer patterned into discrete data islands arranged in concentric tracks and exhibits a narrow switching field distribution (SFD). The disk includes a substrate, a NiTa alloy planarizing layer on the substrate, a nonmagnetic Ru-containing underlayer on the planarizing layer, an oxide-free Co alloy magnetic recording layer, and an ultrathin oxide film between the Ru-containing layer and the Co-alloy magnetic recording layer. The oxide film may be an oxide selected from a Ta-oxide, a Co-oxide and a Ti-oxide, and is ultrathin so that it may be considered a discontinuous film. The planarizing layer and ultrathin oxide film improve the growth homogeneity of the Co-alloy recording layer, so that the patterned disk with data islands shows significantly reduced SFD.

Abstract translation: 图案化的垂直磁记录盘具有图案化为离散数据岛的Co合金记录层，其布置在同心轨道中并呈现窄的开关场分布（SFD）。 该盘包括衬底，衬底上的NiTa合金平面化层，平坦化层上的非磁性含Ru底层，不含氧化物的Co合金磁记录层以及Ru含有层和Co之间的超薄氧化物膜 合金磁记录层。 氧化膜可以是选自Ta氧化物，Co氧化物和Ti氧化物的氧化物，并且是超薄的，因此可以认为是不连续的膜。 平坦化层和超薄氧化物膜改善了Co合金记录层的生长均匀性，使得具有数据岛的图案化盘显示出显着降低的SFD。

公开(公告)号：US08163405B2

公开(公告)日：2012-04-24

申请号：US12412403

申请日：2009-03-27

Applicant: Thomas Hauet ,  Olav Hellwig ,  Manfred Ernst Schabes

Inventor： Thomas Hauet ,  Olav Hellwig ,  Manfred Ernst Schabes

IPC: G11B5/66

CPC classification number: G11B5/855 ,  B82Y10/00 ,  G11B5/743 ,  G11B5/82

Abstract: Multiple anisotropy layered magnetic structures for controlling reversal mechanism and tightening of switching field distribution in bit patterned media are disclosed. The invention extends the exchange spring concept to more variable and sophisticated structures. Three or more layers with different anisotropy or anisotropy gradients increase writeability gains beyond the simple hard/soft bilayer exchange spring concept for BPM. The structures have a thin very hard, high anisotropy center layer that acts as a threshold or pinning layer for domain wall propagation through the entire media structure. In addition or alternatively, a thin very soft, low anisotropy center layer in between the commonly used soft surface layer and hard media layer allows quick initial propagation of the domain wall into the center of the media structure. Various properties of the media structures can be tuned more independently for optimization if using more advanced multi-anisotropy layer stacks.

Abstract translation: 公开了用于控制反向机构的多个各向异性分层磁结构和紧固位图案化介质中的开关场分布。 本发明将交换弹簧概念扩展到更可变和复杂的结构。 具有不同各向异性或各向异性梯度的三层或更多层可提高超过BPM的简单硬/软双层交换弹簧概念的可写性增益。 该结构具有薄的非常硬，高各向异性中心层，其作为用于通过整个介质结构传播的畴壁的阈值或钉扎层。 另外或替代地，在通常使用的软表面层和硬介质层之间的薄的非常柔软的低各向异性中心层允许域壁快速地初始传播到介质结构的中心。 如果使用更先进的多向各向异性层堆叠，则可以更独立地调整介质结构的各种特性以进行优化。

公开(公告)号：US08130468B2

公开(公告)日：2012-03-06

申请号：US11957981

申请日：2007-12-17

Applicant: Thomas Robert Albrecht ,  Olav Hellwig

Inventor： Thomas Robert Albrecht ,  Olav Hellwig

IPC: G11B5/82

CPC classification number: G11B5/855 ,  B82Y10/00 ,  C23C14/22 ,  C23C14/225 ,  C23C14/226 ,  G11B5/743 ,  G11B5/82 ,  Y10T29/49021 ,  Y10T29/49069

Abstract: A bit patterned magnetic media design for reducing the amount of magnetic material located in the trenches between topographic features is disclosed. An intermediate non-magnetic layer is deposited on the topography prior to depositing the functional magnetic layer on the topographic substrate features. The non-magnetic layer increases the width of the land regions that will ultimately support the functional magnetic layer. The non-magnetic layer also reduces the amount of trench deposition that can occur in the subsequent deposition of the magnetic recording layer. By eliminating most of the magnetic trench material, the amount of magnetic flux and readback interference produced by the trench material is reduced to an acceptable level.

Abstract translation: 公开了一种用于减少位于地形特征之间的沟槽中的磁性材料的量的位图形磁介质设计。 在将功能磁性层沉积在地形衬底特征上之前，将中间非磁性层沉积在形貌上。 非磁性层增加最终支撑功能磁性层的焊盘区域的宽度。 非磁性层还减少了在随后的磁记录层沉积中可能发生的沟槽沉积量。 通过消除大多数磁沟槽材料，由沟槽材料产生的磁通量和回读干扰量减少到可接受的水平。

公开(公告)号：US08031561B2

公开(公告)日：2011-10-04

申请号：US12607933

申请日：2009-10-28

Applicant: Olav Hellwig ,  Barry C. Stipe

Inventor： Olav Hellwig ,  Barry C. Stipe

IPC: G11B11/00

CPC classification number: G11B5/1278 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/3133 ,  G11B5/6088 ,  G11B5/7325 ,  G11B5/746 ,  G11B5/82 ,  G11B5/855 ,  G11B2005/0005 ,  G11B2005/0021

Abstract: A system according to one embodiment includes a magnetic recording medium having a magnetic layer with features in a discrete track configuration or a bit patterned configuration and an underlayer adjacent the magnetic layer, the underlayer comprising a material capable of forming surface plasmon resonance; and a magnetic head having: a writer for writing to the medium; and a near-field transducer for heating the medium for thermally assisted recording. Additional systems and methods are also presented.

Abstract translation: 根据一个实施例的系统包括具有磁体层的磁记录介质，其特征在于离散轨道配置或位图案化配置以及邻近磁性层的底层，底层包括能够形成表面等离子体共振的材料; 以及磁头，其具有：写入到所述介质的写入器; 以及用于加热用于热辅助记录的介质的近场换能器。 还介绍了其他系统和方法。

公开(公告)号：US20110085264A1

公开(公告)日：2011-04-14

申请号：US12577344

申请日：2009-10-12

Applicant: Thomas Hauet ,  Olav Hellwig ,  Kentaro Takano

Inventor： Thomas Hauet ,  Olav Hellwig ,  Kentaro Takano

IPC: G11B5/127 ,  G11B5/667

CPC classification number: G11B5/855 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/66 ,  G11B5/7325 ,  G11B5/746 ,  G11B5/82

Abstract: A patterned perpendicular magnetic recording medium, such as a disk for use in hard disk drives, has a flux channeling layer (FCL) located below the recording layer (RL) in each of the discrete data islands. The disk includes a substrate, a soft underlayer (SUL) of soft magnetically permeable material on the substrate, and a nonmagnetic exchange break layer (EBL) on the SUL. A nonmagnetic separation layer (SL) is located between the FCL and the RL in the islands. The FCL has an anisotropy field substantially lower than the anisotropy field of the RL, and a magnetization equal to or higher than the magnetization of the RL. The FCL is saturated at a much lower field than the RL and thus channels the magnetic flux from the write head through the island positions. The dipolar fields from the RL above the FCL polarize the magnetization of the FCL parallel to the magnetization direction of the RL in the absence of an external field, to thereby enhance the readback signal.

Abstract translation: 图形化的垂直磁记录介质，例如用于硬盘驱动器的盘，在每个离散数据岛中具有位于记录层（RL）下方的通量沟道层（FCL）。 盘包括衬底，衬底上的柔软的可渗透材料的软底层（SUL）和SUL上的非磁性交换断裂层（EBL）。 非磁性分离层（SL）位于FCL和岛之间的RL之间。 FCL具有大大低于RL的各向异性场的各向异性场，以及等于或高于RL的磁化强度的磁化强度。 FCL在比RL低得多的场处饱和，从而将来自写入头的磁通量通过岛位置。 来自FCL以上的RL的偶极场在没有外部场的情况下使FCL的磁化平行于RL的磁化方向偏振，从而增强回读信号。

公开(公告)号：US07862912B2

公开(公告)日：2011-01-04

申请号：US12041930

申请日：2008-03-04

Applicant: Olav Hellwig ,  Bruce David Terris ,  Jan-Ulrich Thiele

Inventor： Olav Hellwig ,  Bruce David Terris ,  Jan-Ulrich Thiele

IPC: G11B5/66

CPC classification number: G11B5/66 ,  Y10T428/1171

Abstract: A perpendicular magnetic recording medium, usable for either continuous or patterned media, has a recording layer structure (RLS) of first and second perpendicular magnetic layers (PM1, PM2) and an antiferromagnetically coupling (AFC) layer and a ferromagnetic switching layer (SWL) between PM1 and PM2. The magnetic recording system uses heat to assist in the reading and/or writing of data. The SWL is a Co/Ni multilayer with a Curie temperature (TC-SWL) less than the Curie temperatures of PM1 and PM2. At room temperature, there is ferromagnetic coupling between SWL and the upper ferromagnetic layer (PM2) so that the magnetizations of SWL and PM2 are parallel, and antiferromagnetic coupling between SWL and the lower ferromagnetic layer (PM1) across the AFC layer so that the magnetization of PM1 is aligned antiparallel to the magnetizations of SWL and PM2. When the SWL is heated to above TC-SWL it is no longer ferromagnetic, there is no antiferromagnetic coupling between the SWL and PM1 across the AFC layer, and the magnetizations of PM1 and PM2 become aligned parallel.

Abstract translation: 可用于连续或图案化介质的垂直磁记录介质具有第一和第二垂直磁性层（PM1，PM2）和反铁磁耦合（AFC）层和铁磁性切换层（SWL）的记录层结构（RLS） PM1和PM2之间。 磁记录系统使用热量来辅助读取和/或写入数据。 SWL是具有低于PM1和PM2的居里温度的居里温度（TC-SWL）的Co / Ni多层。 在室温下，在SWL和上铁磁层（PM2）之间存在铁磁耦合，使得SWL和PM2的磁化平行，并且SWL与AFC层之间的下铁磁层（PM1）之间的反铁磁耦合，使得磁化 的PM1与SWL和PM2的磁化反平行排列。 当SWL被加热到高于TC-SWL时，它不再是铁磁性的，在AFC层之间的SWL和PM1之间没有反铁磁耦合，并且PM1和PM2的磁化平行排列。

公开(公告)号：US20090226762A1

公开(公告)日：2009-09-10

申请号：US12041930

申请日：2008-03-04

Applicant: Olav Hellwig ,  Bruce David Terris ,  Jan-Ulrich Thiele

Inventor： Olav Hellwig ,  Bruce David Terris ,  Jan-Ulrich Thiele

IPC: G11B5/65

CPC classification number: G11B5/66 ,  Y10T428/1171

Abstract: A perpendicular magnetic recording medium, usable for either continuous or patterned media, has a recording layer structure (RLS) of first and second perpendicular magnetic layers (PM1, PM2) and an antiferromagnetically coupling (AFC) layer and a ferromagnetic switching layer (SWL) between PM1 and PM2. The magnetic recording system uses heat to assist in the reading and/or writing of data. The SWL is a Co/Ni multilayer with a Curie temperature (TC-SWL) less than the Curie temperatures of PM1 and PM2. At room temperature, there is ferromagnetic coupling between SWL and the upper ferromagnetic layer (PM2) so that the magnetizations of SWL and PM2 are parallel, and antiferromagnetic coupling between SWL and the lower ferromagnetic layer (PM1) across the AFC layer so that the magnetization of PM1 is aligned antiparallel to the magnetizations of SWL and PM2. When the SWL is heated to above TC-SWL it is no longer ferromagnetic, there is no antiferromagnetic coupling between the SWL and PM1 across the AFC layer, and the magnetizations of PM1 and PM2 become aligned parallel.

Abstract translation: 可用于连续或图案化介质的垂直磁记录介质具有第一和第二垂直磁性层（PM1，PM2）和反铁磁耦合（AFC）层和铁磁性切换层（SWL）的记录层结构（RLS） PM1和PM2之间。 磁记录系统使用热量来辅助读取和/或写入数据。 SWL是具有低于PM1和PM2的居里温度的居里温度（TC-SWL）的Co / Ni多层。 在室温下，在SWL和上铁磁层（PM2）之间存在铁磁耦合，使得SWL和PM2的磁化平行，并且SWL与AFC层之间的下铁磁层（PM1）之间的反铁磁耦合，使得磁化 的PM1与SWL和PM2的磁化反平行排列。 当SWL被加热到高于TC-SWL时，它不再是铁磁性的，在AFC层之间的SWL和PM1之间没有反铁磁耦合，并且PM1和PM2的磁化平行排列。

公开(公告)号：US06947235B2

公开(公告)日：2005-09-20

申请号：US10727826

申请日：2003-12-03

Applicant: Manfred Albrecht ,  Olav Hellwig ,  Guohan Hu ,  Bruce David Terris

Inventor： Manfred Albrecht ,  Olav Hellwig ,  Guohan Hu ,  Bruce David Terris

IPC: G11B5/65 ,  G11B5/64 ,  G11B5/66 ,  G11B5/73 ,  G11B5/738 ,  G11B5/855 ,  G11B5/02

CPC classification number: G11C11/5607 ,  G11B5/66 ,  G11B5/746 ,  G11B5/855 ,  G11C11/161 ,  G11C11/1675

Abstract: A patterned perpendicular magnetic recording medium has magnetic islands that contain stacks of individual magnetic cells to provide multilevel recording. Each cell in an island is formed of a material or set of materials to provide the cell with perpendicular magnetic anisotropy and is a single magnetic domain. Each cell is magnetically decoupled from the other cells in its island by nonmagnetic spacer layers. Thus each cell can have a magnetization (magnetic moment) in one of two directions (into or out of the plane of the layer making up the cell), and this magnetization is independent of the magnetization of the other cells in its island. This permits multiple magnetic levels or states to be recorded in each magnetic island.