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Method for Identification of Magnetic Particle Contamination

IP.com Disclosure Number: IPCOM000061629D
Original Publication Date: 1986-Sep-01
Included in the Prior Art Database: 2005-Mar-09

Publishing Venue

IBM

Related People

Authors:
Pesch, JA [+details]

Abstract

Hard magnetic particle contamination is a problem in disk files because small magnetized particles can demagnetize a magnetic disk. Particles have been found adhering to magnetic recording heads which have been responsible for disk erasures. There is commonly constant monitoring for magnetic contamination during magnetic disk, head and file manufacture. This is a costly process involving many people, much time and expensive scanning electron microscopes. A technique has been developed for detection of hard magnetic particle contamination utilizing an optical microscope. This technique is inexpensive with respect to the equipment necessary for implementation and is efficient in the use of time required to detect magnetic particles. As shown in the figure, the technique requires: 1.