公开(公告)号：US08748018B2

公开(公告)日：2014-06-10

申请号：US12577344

申请日：2009-10-12

申请人： Thomas Hauet ,  Olav Hellwig ,  Kentaro Takano

发明人： Thomas Hauet ,  Olav Hellwig ,  Kentaro Takano

IPC分类号： G11B5/66

CPC分类号： G11B5/855 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/66 ,  G11B5/7325 ,  G11B5/746 ,  G11B5/82

摘要： 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.

摘要翻译： 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：US08163405B2

公开(公告)日：2012-04-24

申请号：US12412403

申请日：2009-03-27

申请人： Thomas Hauet ,  Olav Hellwig ,  Manfred Ernst Schabes

发明人： Thomas Hauet ,  Olav Hellwig ,  Manfred Ernst Schabes

IPC分类号： G11B5/66

CPC分类号： G11B5/855 ,  B82Y10/00 ,  G11B5/743 ,  G11B5/82

摘要： 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.

摘要翻译： 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

申请人： Thomas Robert Albrecht ,  Olav Hellwig

发明人： Thomas Robert Albrecht ,  Olav Hellwig

IPC分类号： G11B5/82

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

摘要： 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.

摘要翻译： 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

申请人： Olav Hellwig ,  Barry C. Stipe

发明人： Olav Hellwig ,  Barry C. Stipe

IPC分类号： G11B11/00

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

摘要： 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.

摘要翻译： 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

申请人： Thomas Hauet ,  Olav Hellwig ,  Kentaro Takano

发明人： Thomas Hauet ,  Olav Hellwig ,  Kentaro Takano

IPC分类号： G11B5/127 ,  G11B5/667

CPC分类号： G11B5/855 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/66 ,  G11B5/7325 ,  G11B5/746 ,  G11B5/82

摘要： 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.

摘要翻译： 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

申请人： Olav Hellwig ,  Bruce David Terris ,  Jan-Ulrich Thiele

发明人： Olav Hellwig ,  Bruce David Terris ,  Jan-Ulrich Thiele

IPC分类号： G11B5/66

CPC分类号： G11B5/66 ,  Y10T428/1171

摘要： 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.

摘要翻译： 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

申请人： Olav Hellwig ,  Bruce David Terris ,  Jan-Ulrich Thiele

发明人： Olav Hellwig ,  Bruce David Terris ,  Jan-Ulrich Thiele

IPC分类号： G11B5/65

CPC分类号： G11B5/66 ,  Y10T428/1171

摘要： 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.

摘要翻译： 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

申请人： Manfred Albrecht ,  Olav Hellwig ,  Guohan Hu ,  Bruce David Terris

发明人： Manfred Albrecht ,  Olav Hellwig ,  Guohan Hu ,  Bruce David Terris

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

CPC分类号： G11C11/5607 ,  G11B5/66 ,  G11B5/746 ,  G11B5/855 ,  G11C11/161 ,  G11C11/1675

摘要： 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.

公开(公告)号：US06882488B1

公开(公告)日：2005-04-19

申请号：US10727812

申请日：2003-12-03

申请人： Manfred Albrecht ,  Olav Hellwig ,  Guohan Hu ,  Bruce David Terris

发明人： Manfred Albrecht ,  Olav Hellwig ,  Guohan Hu ,  Bruce David Terris

IPC分类号： G11B5/00 ,  G11B5/027 ,  G11B5/02

CPC分类号： G11B5/027 ,  G11B2005/0029

摘要： A magnetic recording method uses a patterned perpendicular magnetic recording medium where each magnetic block or island contains a stack of individual magnetic cells to providing 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.

摘要翻译： 磁记录方法使用图案化的垂直磁记录介质，其中每个磁块或岛包含单个磁性单元的堆叠以提供多级记录。 岛中的每个单元由材料或材料组成，以向单元提供垂直的磁各向异性并且是单个磁畴。 每个单元通过非磁性间隔层与其岛中的其它单元磁耦合。 因此，每个单元可以在两个方向（组成单元的层的平面内或外）中的一个方向上具有磁化（磁矩），并且该磁化独立于其岛中的其它单元的磁化。 这允许在每个磁岛中记录多个磁级或状态。

公开(公告)号：US08129043B2

公开(公告)日：2012-03-06

申请号：US12423258

申请日：2009-04-14

申请人： Thomas Hauet ,  Olav Hellwig ,  Lidu Huang

发明人： Thomas Hauet ,  Olav Hellwig ,  Lidu Huang

IPC分类号： G11B5/66

CPC分类号： G11B5/82 ,  B82Y10/00 ,  G11B5/02 ,  G11B5/743 ,  G11B5/746 ,  G11B5/855 ,  G11B2005/0002

摘要： Multilayer magnetic structures control the switching field and tighten the switching field distribution in bit patterned media. A strain-inducing layer is excited, e.g., by a localized magnetic field or a localized thermal heating or a voltage, and induces a strain on the magnetic layer(s) of the patterned bit to initiate switching of the bit magnetization. The strain induced on the magnetic layer forces a rotation or an amplitude variation of the magnetic layer anisotropy. A localized magnetic field is simultaneously or subsequently applied to complete the switching of the bit magnetization. The invention provides control of switching field and switching field distribution for bit-patterned media devices.

摘要翻译： 多层磁性结构控制开关场，并拧紧位图形介质中的开关场分布。 应变诱发层例如通过局部磁场或局部热加热或电压而被激发，并且在图案化位的磁性层上引起应变以启动位磁化的切换。 在磁性层上诱发的应变促使磁性层各向异性的旋转或振幅变化。 同时或随后施加局部磁场以完成位磁化的切换。 本发明提供了针对位图形媒体设备的开关场和开关场分布的控制。