Magnetic Properties of Exchange-Coupled Dual-Layer SmTbCo Thin Films
HUANG Zhi-Xin1, GAO Jian-Ming1, DING Xiao-Xia1, ZHANG Ping1,2, WANG Xiang3, LI Zuo-Yi3
1Department of Physics, Central China Normal University, Wuhan 430079
2Department of Physics, Yunyang Teachers College, Danjiangkou 442700
3Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074
Magnetic Properties of Exchange-Coupled Dual-Layer SmTbCo Thin Films
1Department of Physics, Central China Normal University, Wuhan 430079
2Department of Physics, Yunyang Teachers College, Danjiangkou 442700
3Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074
Abstract： Exchange-coupled SmTbCo dual-layer media are prepared by an r.f magnetron sputtering system and their magnetic properties are investigated. The prepared SmTbCo dual layer is composed of a 340emu/cm3 TM-rich readout layer and a 5.80 kOe RE-rich memory layer, meeting the requirements of high saturation magnetization and large coercivity for hybrid recording. Through exchange coupling, the coercivity of the high-saturation-magnetization SmTbCo layer is greatly enhanced from 1.85 to 5.96kOe. The calculated interface wall energy for Sm6.65Tb12.35Co81 (20nm)/Sm1.22Tb42.16Co56.62 (20nm) is about 3.85erg/cm2. The reversal magnetization of the SmTbCo exchange-coupling dual-layer films is analysed based on a micro-magnetic model.
2007, Vol. 24 
