Agency for Science, Technology and Research

Data Storage Institute

Kaidong Ye

Chengwu An

Zhimin Yuan

Siang Huei Leong

Chun Lian Ong

Minghui Hong

Budi Santoso

Yongfeng Lu

Joo Boon Marcus Travis Lim

A magnetic media tester comprising a Laser Doppler Vibrometer (LDV) head; and a magnetic read head; the LDV head and the magnetic read head being configured for obtaining correlatable data of a region on a magnetic disk.

Magnetic media tester and a method of magnetic media testing

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.

Method and apparatus for testing magnetic properties of magnetic media

The invention relates to a method and apparatus for cutting a substrate using laser irradiation. A laser beam is scanned over a substrate. The beam ablates a first layer of the substrate. The beam is then refocused onto the newly revealed second layer and a further pass is performed. The process is repeated until complete separation occurs. The method and apparatus are particularly suitable for singulation of IC packages.

Method and apparatus for cutting a substrate using laser irradiation

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Singapore, Singapore

Kaidong Ye