Abstract
Exchange-coupled SmTbCo dual-layer media are prepared by an r.fmagnetron sputtering system and their magnetic properties areinvestigated. The prepared SmTbCo dual layer is composed of a340 emu/cm3 TM-rich readout layer and a 5.80 kOe RE-richmemory layer, meeting the requirements of high saturation magnetizationand large coercivity for hybrid recording. Through exchange coupling,the coercivity of the high-saturation-magnetization SmTbCo layer isgreatly enhanced from 1.85 to 5.96 kOe. The calculated interface wallenergy for Sm6.65Tb12.35Co81(20 nm)/Sm1.22Tb42.16Co56.62 (20 nm) is about3.85 erg/cm2. The reversal magnetization of the SmTbCoexchange-coupling dual-layer films is analysed based on a micro-magneticmodel.
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