公开(公告)号：US06280813B1

公开(公告)日：2001-08-28

申请号：US09416364

申请日：1999-10-08

Applicant: Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Hal Jervis Rosen ,  Manfred Ernst Schabes

Inventor： Matthew Joseph Carey ,  Eric Edward Fullerton ,  Bruce Alvin Gurney ,  Hal Jervis Rosen ,  Manfred Ernst Schabes

IPC: B32B302

CPC classification number: C23C28/021 ,  C23C28/00 ,  C23C28/023 ,  C23C28/42 ,  G11B5/66

Abstract: A magnetic recording medium for data storage uses a magnetic recording layer having at least two ferromagnetic films antiferromagnetically coupled together across a nonferromagnetic spacer film. The magnetic moments of the two antiferromagnetically-coupled films are oriented antiparallel, and thus the net remanent magnetization-thickness product (Mrt) of the recording layer is the difference in the Mrt values of the two ferromagnetic films. This reduction in Mrt is accomplished without a reduction in the thermal stability of the recording medium because the volumes of the grains in the antiferromagnetically-coupled films add constructively. In a magnetic recording rigid disk application, the magnetic layer comprises two ferromagnetic films, each a granular film of a sputter deposited CoPtCrB alloy, separated by a Ru spacer film having a thickness to maximize the antiferromagnetic exchange coupling between the two CoPtCrB films. One of the ferromagnetic films is made thicker than the other, but the thicknesses are chosen so that the net moment in zero applied magnetic field is low, but nonzero.

Abstract translation: 用于数据存储的磁记录介质使用具有至少两个铁磁膜的磁记录层，其通过非铁磁间隔膜反铁磁耦合在一起。 两个反铁磁耦​​合薄膜的磁矩定向反平行，因此记录层的净残磁强度 - 厚度积（Mrt）是两个铁磁膜的Mrt值之差。 由于反铁磁耦合膜中的晶粒的体积增加，所以Mrt的这种减少是在记录介质的热稳定性降低的情况下完成的。 在磁记录刚性盘应用中，磁性层包括两个铁磁膜，每个是由溅射沉积的CoPtCrB合金的粒状膜，由具有厚度的Ru隔离膜隔开，以使两个CoPtCrB膜之间的反铁磁交换耦合最大化。 其中一个铁磁膜比另一个更厚，但是选择厚度使得零施加磁场的净力矩低，但非零。

公开(公告)号：US5761188A

公开(公告)日：1998-06-02

申请号：US893030

申请日：1997-07-15

Applicant: Hal Jervis Rosen ,  Kurt Allan Rubin ,  Wade Wai-Chung Tang

Inventor： Hal Jervis Rosen ,  Kurt Allan Rubin ,  Wade Wai-Chung Tang

IPC: G11B7/00 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/09 ,  G11B7/24 ,  G11B7/243 ,  G11B7/257

CPC classification number: G11B7/24 ,  G11B7/00454 ,  G11B7/0052 ,  G11B7/243 ,  G11B7/257 ,  G11B2007/0013 ,  G11B2007/24312 ,  G11B2007/24314 ,  G11B2007/24316 ,  G11B7/2533 ,  G11B7/2542

Abstract: A multiple recording layer rewriteable phase-change optical disk and disk drive uses a reverse writing type of reversible phase-change material as the recording layer nearest the incident laser light. The disk has a light-transmissive substrate onto which the laser light is incident. The substrate supports at least two spatially-separated multilayer recording stacks, each stack including an active recording layer of reversible or rewriteable phase-change material. The recording stack located nearest the substrate on which the laser light is incident includes a reverse writing type of reversible phase change material, i.e., a phase-change material with an amorphous starting phase that is recorded onto by laser heating that converts data regions to the crystalline phase. This first recording layer has a dielectric layer in contact with it that has a high index of refraction relative to the adjacent recording layer and that acts as an optical interference film to provide a constructive optical interference effect in the recording stack. The optical interference film optimizes the contrast, reflectivity, and transmissivity of the recording stack. The optical interference film is also nonabsorbing so that laser light can pass through it to focus on a recording layer in a farther recording stack. This allows the farther recording layer to be written using reasonable laser power.

Abstract translation: 多记录层可重写相变光盘和磁盘驱动器使用反向写入型可逆相变材料作为最接近入射激光的记录层。 光盘具有入射激光的透光基板。 衬底支撑至少两个空间分离的多层记录堆叠，每个堆叠包括可逆或可重写的相变材料的活性记录层。 最靠近激光入射的衬底的记录堆叠包括反向写入型的可逆相变材料，即具有非晶起始相的相变材料，其通过激光加热记录，其将数据区域转换为 结晶相。 该第一记录层具有与其接触的电介质层，其具有相对于相邻记录层的高折射率，并且其用作光学干涉膜以在记录堆叠中提供建设性的光学干涉效应。 光学干涉膜优化了记录叠层的对比度，反射率和透射率。 光学干涉膜也是不吸收的，使得激光可以通过它来聚焦在更远的记录堆叠中的记录层。 这允许使用合理的激光功率写入更远的记录层。

公开(公告)号：US06773834B2

公开(公告)日：2004-08-10

申请号：US10059527

申请日：2002-01-29

Applicant: Hoa Van Do ,  Eric Edward Fullerton ,  David Thomas Margulies ,  Hal Jervis Rosen

Inventor： Hoa Van Do ,  Eric Edward Fullerton ,  David Thomas Margulies ,  Hal Jervis Rosen

IPC: G11B566

CPC classification number: C23C28/021 ,  C23C28/023 ,  C23C28/42 ,  C23C28/44 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/265

Abstract: A laminated magnetic recording medium for data storage has an antiferromagnetically-coupled (AFC) layer and a single ferromagnetic layer spaced apart by a nonferromagnetic spacer layer. The AFC layer is formed as two ferromagnetic films antiferromagnetically coupled together across an antiferromagnetically coupling film that has a composition and thickness to induce antiferromagnetic coupling. In each of the two remanent magnetic states, the magnetic moments of the two antiferromagnetically-coupled films in the AFC layer are oriented antiparallel, and the magnetic moment of the single ferromagnetic layer and the greater-moment ferromagnetic film of the AFC layer are oriented parallel. The nonferromagnetic spacer layer between the AFC layer and the single ferromagnetic layer has a composition and thickness to prevent antiferromagnetic exchange coupling. The laminated medium has improved thermal stability and reduced intrinsic media noise.

Abstract translation: 用于数据存储的叠层磁记录介质具有反铁磁耦合（AFC）层和由非铁磁隔离层隔开的单个铁磁层。 AFC层由反铁磁耦合膜反铁磁耦合在一起的两个铁磁膜形成，其具有组成和厚度以诱导反铁磁耦合。 在两个剩余磁状态中的每一个中，AFC层中的两个反铁磁耦​​合膜的磁矩取向反平行，并且单个铁磁层的磁矩和AFC层的较大时刻铁磁膜的取向平行 。 AFC层和单个铁磁层之间的非铁磁间隔层具有防铁磁交换耦合的组成和厚度。 层压介质具有改善的热稳定性和降低的本征介质噪声。

公开(公告)号：US5986761A

公开(公告)日：1999-11-16

申请号：US110925

申请日：1998-07-06

Applicant: Linden Crawforth ,  Wayne Isami Imaino ,  Anthony Juliana, Jr. ,  Milton Russell Latta ,  Hal Jervis Rosen

Inventor： Linden Crawforth ,  Wayne Isami Imaino ,  Anthony Juliana, Jr. ,  Milton Russell Latta ,  Hal Jervis Rosen

IPC: G01B11/30 ,  G01N21/88

CPC classification number: G01B11/306 ,  G01N21/88

Abstract: A laser-based inspection tool (LIT) for disks that allows simultaneous inspection of disk surfaces for defects and curvature. The laser beam is directed by a rotating scanner, such as a rotating polygon mirror, to the input of a telecentric lens assembly that provides an output beam parallel to its optical axis as the beam is being scanned. The output beam from the telecentric lens strikes the disk surface substantially perpendicularly. The beam is then reflected from the disk surface and passes back through a collection lens to the sensing surface of an optical detector. The detector outputs analog signals that represent the X and Y positions on the sensing surface where the reflected light beam is incident, which thus correspond to the slope of the disk surface at the point where the laser beam was incident. A mechanical disk lifter moves the disk in a plane parallel to the disk surface so that different scan lines can be generated on the disk surface. A processor, such as a personal computer, receives the output signals from the detector and calculates the slope values, and from the slope values, the curvature of the disk surface. A large number of points on each scan line are sampled, and a large number of scan lines are generated, so that the disk surface curvature can be calculated at various locations and over various ranges of the disk surface. The large number of sample points and the rapid calculation of slope values enables the shape of disk surface defects to be determined, which allows the disk defects to be classified as pits or bumps.

Abstract translation: 用于磁盘的基于激光的检测工具（LIT），允许同时检查磁盘表面的缺陷和曲率。 激光束由诸如旋转多面镜的旋转扫描器引导到远心透镜组件的输入端，当远射镜被扫描时，其提供平行于其光轴的输出光束。 来自远心透镜的输出光束大致垂直地撞击盘表面。 光束然后从盘表面反射并通过收集透镜返回到光学检测器的感测表面。 检测器输出表示反射光束入射的感测表面上的X和Y位置的模拟信号，其因此对应于激光束入射点处的盘表面的斜率。 机械盘式升降机使盘在平行于盘表面的平面内移动，从而可以在盘表面上产生不同的扫描线。 诸如个人计算机的处理器从检测器接收输出信号并计算斜率值，并从斜率值计算出盘表面的曲率。 对每个扫描线上的点数进行采样，并产生大量的扫描线，从而可以在各种位置和盘表面的各种范围内计算盘表面曲率。 大量采样点和斜率值的快速计算可以确定磁盘表面缺陷的形状，从而可以将磁盘缺陷分类为凹坑或凸块。