Magnetic dot-arrays with dot diameters of 80 to 1000 mn have been fabricate
d by patterning CoPt alloy continuous films. All of the fabricated dots had
their magnetic easy axes perpendicular to the plane. From MFM observations
, dots with diameters of 160 nm and larger had multi domain structures. For
the dot-array with 80 nm dot diameter, every dot was observed as a single
domain. CoPt dot-array with 80 mn dot diameter showed excellent thermal sta
bility in comparison with conventional longitudinal media and perpendicular
media.