NDLI: Reverse field orientation effects on rigid disk coating

Content Provider	IEEE Xplore Digital Library
Author	Teng, E. Johnson, K.
Copyright Year	1965
Abstract	A reverse magnetic field usually exists for orienting electromagnets used to align particles in magnetic media. Disk disorientation caused by this reverse field, known as the "dorf effect", was found to be a strong function of coating rheology, actual process steps, and reverse field magnitude. Experiments were done on 8-inch and 14-inch rigid disks with coatings of different viscosity varying the most sensitive orientation process parameter, spin-off time. In addition, more controlled experiments were done using 1/2-inch-diameter hand-coated aluminum disks exposed in the gap of an electromagnet to an orienting field followed by varying magnitudes of disorienting fields. Finally, a modified orientation electromagnet with a reduced reverse field was constructed. Our conclusions are that reverse field magnitudes, required to produce significant disorientation are strong functions of coating viscosity, coating formulation, and spin-off times. A 100 Oe reverse field creates a disorienting problem only when using very short spin-off times for coatings of low viscosity, containing a significant portion of high boiling point solvents. Reverse fields larger than 200 Oe, resulting from either high orienting current or a particular electromagnet design, will cause serious disorientation for most magnetic coatings.
Sponsorship	IEEE Magnetics Society
Starting Page	1089
Ending Page	1091
Page Count	3
File Size	277733
File Format	PDF
ISSN	00189464
Volume Number	18
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1982-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coatings Saturation magnetization Viscosity Electromagnets Magnets Magnetic fields Aluminum Solvents Magnetic particles Rheology
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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