A magnetic recording disk drive has an inductive write head and a heater to record
data in laminated media on the recording disk. The laminated media, with at least
two ferromagnetic layers separated by a nonmagnetic spacer layer, improves SNR.
Each of the ferromagnetic layers can be formed of a material having an intrinsic
coercivity capable of being written by a conventional inductive write head, but
because of the desired lamination to increase SNR, the ferromagnetic layer farthest
from the write head is exposed to a magnetic field less than its intrinsic coercivity
and thus can not be written. To write to the laminated media, heat is directed
to the lower ferromagnetic layer to reduce its intrinsic coercivity below the magnetic
field to which it is exposed.