Typical
hysteresis loops are shown for
conventional media and AFC media
which indicate how this new
media structure responds to
an external magnetic field as
would originate from a recording
head. The blue curves are major
loops while the remanent loops
are in red. Increasing the applied
field reduces AF coupling until
at >6000 Oe both top and
bottom layers are parallel.
Reducing the applied field returns
the antiparallel state which
is the stable remanent state
after saturation in a positive
field. In a reverse applied
field, the remanent state is
stable until the top layer reverses,
at this point both layers are
parallel and aligned in the
negative saturation state. The
remanent curve for both AFC
and conventional single layer
media are identical, but the
path in AFC media is shown to
pass through an intermediate
parallel state. |
