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TbFeCo or other high rotation high Tc materials can be used for both layers of a double layer magneto-optic medium, provided the Tcomp, compensation temps, are properly adjusted.
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Double Layer Direct Overwrite of Magneto-Optic Media
TbFeCo or other high rotation high Tc materials can be used for both layers
of a double layer magneto-optic medium, provided the Tcomp, compensation
temps, are properly adjusted.
The two materials should have Hc vs temp curves as shown in Fig. 1. Tcomp
of the memory layer (laser side) should be lower than Tcomp of the bias layer
(non-laser side). Writing is shown in Fig. 2, and reset is shown in Fig. 3.
Erase in this method does not depend on heating the memory layer above Tc
with the lower power pulse. Heating must be to a temperature such that the laser
bias field, HW, is less than Hc of the bias film so that the bias film does not
switch. In addition, the erase temp must be high enough to allow switching of the
memory layer by the exchange coupling between the two films, even though the
write field, HW, is in a direction to write the memory layer. Exchange coupling is
strong enough to erase the memory layer, as shown in Fig. 4.