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    • 4. 发明申请
    • METHOD AND APPARATUS FOR TESTING MAGNETO-OPTICAL HARD DISKS
    • 用于测试磁光硬盘的方法和装置
    • WO2015009168A1
    • 2015-01-22
    • PCT/NZ2014/000146
    • 2014-07-15
    • HTS-110 LIMITED
    • FEE, Michael, GraemeDICKIE, Oliver, John
    • G11B11/105G01R33/032
    • G01R33/0325G01N21/21G01N27/72G01R33/032G01R33/1207
    • A magnetic testing apparatus includes a magnet assembly with a sample path extending through the magnet assembly. The magnetic field produced by the magnet assembly defines a known, varying magnetic field profile along the sample path. A sample is moved along sample path such that the sample portion is subjected to a predetermined magnetic field ramp or magnetic field profile during a measurement period. A measurement arrangement is also provided to measure one or more properties of the sample during the measurement period, in order to test sample properties at a plurality of different magnetic fields. The apparatus may be particularly suited to magneto-optical measurements, including Magneto-Optical Kerr Effect measurements. The apparatus may be used for testing of hard disk platters.
    • 磁性测试装置包括具有延伸穿过磁体组件的样品路径的磁体组件。 由磁体组件产生的磁场定义了沿着采样路径的已知的,变化的磁场分布。 样品沿着采样路径移动,使得样品部分在测量期间经受预定的磁场斜坡或磁场分布。 还提供测量装置以在测量期间测量样品的一个或多个特性,以便测试在多个不同磁场下的样品特性。 该装置可以特别适用于磁光测量,包括磁光克尔效应测量。 该装置可用于硬盘盘的测试。
    • 5. 发明申请
    • METHOD AND APPARATUS FOR TESTING MAGNETIC PROPERTIES OF MAGNETIC MEDIA
    • 用于测试磁介质磁性的方法和装置
    • WO2009022993A1
    • 2009-02-19
    • PCT/SG2008/000299
    • 2008-08-13
    • AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCHAN, ChengwuYE, Kaidong
    • AN, ChengwuYE, Kaidong
    • G01R33/12G01N27/72G01N21/01
    • G01R33/0325G01N21/21G01N27/72
    • A method and apparatus for testing a magnetic medium. The method comprises applying a magnetic field of a time-varying strength; directing a polarized optical beam towards a portion of the medium that is in the magnetic field, wherein the optical beam is reflected by a surface of the medium at a point of incidence in the magnetic field; moving the medium relative to the optical beam so as to cause the point of incidence to repeatedly traverse each of a plurality of sectors along a track on the surface; obtaining a series of Kerr signal measurements of the reflected optical beam; grouping measurements into ensembles such that the measurements in an individual ensemble are those obtained while the point of incidence was in a corresponding one of the sectors; and determining at least one magnetic property of at least one of the sectors from the measurements in the corresponding ensemble.
    • 一种用于测试磁介质的方法和装置。 该方法包括施加时变强度的磁场; 将偏振光束引导到处于磁场中的介质的一部分,其中所述光束在所述磁场中的入射点处被所述介质的表面反射; 使所述介质相对于所述光束移动,以使所述入射点沿着所述表面上的轨道重复地穿过多个扇区中的每一个; 获得反射光束的一系列克尔信号测量; 将测量分组成集合,使得单个集合中的测量是当发生点在相应的扇区中时获得的测量; 以及从所述相应组合中的测量确定至少一个扇区的至少一个磁性。
    • 7. 发明申请
    • METHOD AND SYSTEM FOR MEASURING KERR ROTATION OF MAGNETO-OPTICAL MEDIUM
    • 用于测量磁光记录介质的KERR旋转的方法和系统
    • WO1998009276A1
    • 1998-03-05
    • PCT/US1997012739
    • 1997-07-22
    • MEDAR, INC.
    • MEDAR, INC.LUSTER, Spencer, D.
    • G11B07/00
    • G11B11/10543G01J4/00G01R33/0325
    • A first and second linear polarizer (14, 16) produce a first and second linearly polarized beam of light, respectively, which are made incident upon a magneto-optical disc (18) at a common point. Both beams have equal or nearly equal intensity. Upon specular reflection from the disc (18), the second and first reflected beams travel through first and second analyzers (14, 16), respectively. The intensities of the second and first reflected beams are detected by first and second photodetectors (22, 24), respectively. A comparator (26) produces a difference between the intensities of the two analyzed beams which is proportional to Kerr rotation and independent of the direction of the stress axes of the magneto-optical disc substrate, and only mildy dependent on the magnitude of the retardation of the substrate.
    • 第一和第二线性偏振器(14,16)分别产生在公共点入射到磁光盘(18)上的第一和第二线性偏振光束。 两个梁的强度相等或几乎相等。 在来自盘(18)的镜面反射时,第二和第一反射光束分别穿过第一和第二分析器(14,16)。 第二和第一反射光束的强度分别由第一和第二光电检测器(22,24)检测。 比较器(26)产生两个分析光束的强度之间的差异,其与克尔旋转成比例,并且独立于磁 - 光盘基片的应力轴的方向,并且只有温和取决于延迟的幅度 底物。
    • 8. 发明申请
    • MULTI FUNCTIONAL SAMPLE HOLDER AND HIGH RESOLUTION DETECTION SYSTEM FOR MAGNETO OPTICAL KERR EFFECT MEASUREMENTS
    • 多功能样品保持器和高分辨率检测系统,用于磁光克尔效应测量
    • WO2017018953A1
    • 2017-02-02
    • PCT/TR2015/050295
    • 2015-12-30
    • GEBZE TEKNIK UNIVERSITESI
    • AKDOGAN, NumanDEMIRCI, Erdem
    • G01R33/032
    • G01R33/0325
    • The multi functional sample holder (6) and the high resolution detection system for Magneto optical Kerr effect measurements subject to the invention has been developed -in order to determine the magnetization curves of the samples (18) to be measured having magnetization at the sample plane and magnetization perpendicular to the sample plane. The system can be converted to Polar MOKE geometry from longitudinal MOKE geometry easily by means of the multi functional sample holder (6). Magnetization measurements depending on angle at the sample plane can be carried out by means of the stepper motor (7) which rotates the sample 360 degrees located in the multifunctional sample holder (6). Additionally high precision measurement results can be obtained even in samples with very weak magnetization by means of a filtering system using a lock-in amplifier (15).
    • 已经开发了多功能样品架(6)和本发明的用于磁光克尔效应测量的高分辨率检测系统,以便确定待测样品(18)的磁化曲线,其具有样品平面的磁化强度 和垂直于样品平面的磁化。 通过多功能样品架(6),系统可以轻松地从纵向MOKE几何转换为极地MOKE几何。 取决于样品平面处的角度的磁化测量可以通过使位于多功能样品架(6)中的样品360度旋转的步进电机(7)来执行。 另外,通过使用锁定放大器(15)的滤波系统,甚至可以获得具有非常弱的磁化的样本的高精度测量结果。