Magnetic properties of exchange-coupled dual-layer SmTbCo thin films

作者：Huang Zhi Xin^*; Gao Jian Ming; Ding Xiao Xia; Zhang Ping; Wang Xiang; Li Zuo Yi

来源：Chinese Physics Letters, 2007, 24(1): 226-228.

DOI：10.1088/0256-307X/24/1/061

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 340 emu/cm(3) 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 5.96 kOe. The calculated interface wall energy for Sm6.65Tb12.35Co81 (20 nm)/Sm1.22Tb42.16Co56.62 (20 nm) is about 3.85 erg/cm(2). The reversal magnetization of the SmTbCo exchange-coupling dual-layer films is analysed based on a micro-magnetic model.

• 出版日期2007-1
• 单位华中科技大学; 南宁师范大学; 华中师范大学