A flexible magnetic-tape substrate is coated on both sides with an underlayer
of
relatively-low coercivity magnetic medium, which in turn is coated with a submicron
layer of chromium dioxide in ultra small particles having a high coercivity. For
longitudinal magnetic recording systems, magnetic layers with a coercivity of at
least 1,500 Oe with underlayers having a coercivity between 25 and 500 Oe are used.
For helical magnetic recording systems, magnetic layers with a coercivity of at
least 2,000 Oe with underlayers having a coercivity between 25 and 800 Oe are used.
These properties greatly reduce the effects of neighboring magnetic fields, thereby
improving signal retention and virtually eliminating print-through and contact recording.
