The superparamagnetic effect
poses a serious challenge for continuing to increase
the areal density and storage capacity of disk drives.
One of the most promising methods to circumvent the
density limitations imposed by this effect is the use
of patterned media. In conventional media, the magnetic
recording layer is a thin film of a magnetic alloy,
which naturally forms a random mosaic of nanometer-scale
grains which behave as independent magnetic elements.
Each recorded bit is made up of many of these random
grains. In patterned media, the magnetic layer is created
as an ordered array of highly uniform islands, each
island capable of storing an individual bit.
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