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摘要: 室温下通过磁控溅射在表面热氧化的Si基片上生长了MgO/FexPt100-x双层膜和FexPt100-x单层膜系列样品,FexPt100-x的原子成分x=48—68.研究了热处理前后不同成分FePt薄膜的晶体结构和磁性的变化,尤其是MgO底层的引入对FePt的晶体结构和磁性的影响
Abstract: We investigated the effect of extensive compositional change on the structure and magnetic properties of the post-annealed FexPt100-x (48≤x≤68) thin films with and without MgO underlayer deposited at room temperature. It was found that, during annealing, the FePt films on MgO underlayer with Fe-rich composition around 59at% exhibit much faster ordering than those with other compositions although the single layer FePt films were found to have the optimum composition for the chemical ordering of only slightly Fe-rich composition of 52at% of Fe. The film of MgO(10 nm)/Fe59Pt41(8 nm) after annealing at 600℃ for 30 min showed perpendicular magnetization with coercivity about 800 kA/m and the squareness was close to 1 due to the formation of (001) oriented ordering phase. The results of FePt thin films on MgO underlayer deposited at room temperature present a striking contrast with those of FePt grown on heated MgO single crystal substrate, where the optimum composition for the ordering was around 62at% of Pt. An interpretation on the observed experimental phenomena is given in this paper.