发明名称 |
METHOD AND APPARATUS FOR TESTING MAGNETIC PROPERTIES OF MAGNETIC MEDIA |
摘要 |
<p>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.</p> |
申请公布号 |
WO2009022993(A1) |
申请公布日期 |
2009.02.19 |
申请号 |
WO2008SG00299 |
申请日期 |
2008.08.13 |
申请人 |
AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH;AN, CHENGWU;YE, KAIDONG |
发明人 |
AN, CHENGWU;YE, KAIDONG |
分类号 |
G01R33/12;G01N21/01;G01N27/72 |
主分类号 |
G01R33/12 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|