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Unusual magnetic recording applications utilizing highly anisotropic recording materials

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1 Author(s)
Fayling, R.E. ; 3M, St.Paul, MN

The extreme anisotropy of certain magnetic recording tapes results in unusual recording properties. Oriented, low coercive force barium ferrite recording tapes are exceptionally resistant to erasure by hard-axis magnetic fields. This property makes it possible to anhysteretically contact duplicate digital signals from a barium ferrite recording tape withHmin_{c}max_{e}(easy-axis) of 715 Oe to cobalt-doped γ-Fe2O3tapes withHmin_{c}max_{e}of 875-1130 Oe, using hard-axis bias fields up to 2000 Oe. The large uniaxial magnetocrystalline anisotropy of oriented barium ferrite tapes also makes them unresponsive to recording-head fields with components along hard-axes-of-magnetization. Consequently, dual-layer barium ferrite recording tapes with in-plane easy-axes-of-magnetization oriented at +45° and -45°, respectively, to the longitudinal-tape-axis can be independently recorded, read, and erased using heads with gap-length parallel to the easy-axis of a selected layer. Signal amplitude losses on one layer, resulting from recording or erasing the other layer, are about 11% (1dB) for 27 flux transition/cm digital signals.

Published in:

Magnetics, IEEE Transactions on  (Volume:15 ,  Issue: 6 )

Date of Publication:

Nov 1979

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