a laminate structure is disclosed comprising multiple ferromagnetic layers achieving incoherent reversal while maintaining good snr . a high magnetic moment density , low anisotropy field material may form a thin overlayer deposited over a high - anisotropy media layer . the media layer may have a lower magnetic moment density than the overlayer and have decoupled magnetic grains . a coupling layer may be interposed between the overlayer and the media layer to modulate the exchange there between , thereby reducing the pass - through of noise while still promoting incoherent reversal to achieve reduced write energy requirements .