Production of magnetic media

Details Production of magnetic media Production of magnetic media

1977-09-26

1979-12-04

Pianalto, Bernard D.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

For magnetizing or demagnetizing

427 48, H01F 1002

Patent

active

041774426

ABSTRACT:
A permanent magnet orients magnetic particles on a tape in a desired direction along the tape length (or, by rotating the magnet structure, at any desired angle to the tape length) while the tape moves past the magnet's gap. The magnet's poles are asymmetric about a time drawn through the gap center and perpendicular to the medium to first present an unfocused low intensity magnetic field to the tape followed by a narrowly focused high intensity field in the opposite direction, which latter field aligns a large proportion of the particles along desired parallel lines. Antennae attached to the pole pieces dissipate any additional undesired fields which might adversely affect the particle alignment achieved by the high intensity field.

REFERENCES:
patent: 4003336 (1977-01-01), Koester et al.

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