The effect of growth surface morphology on the crystal structure and magnetic property of L1₀ order PtFe layers deposited by magnetron sputtering

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• 作者：Wanyu Ding^a ; ^b ; ¹ ; ^{dwysd_2000@163.com} ; Satoshi Ishiguro^a ; ² ; Ryo Ogatsu^a ; ² ; Dongying Ju^a ; ^{dyju@sit.ac.jp}
• 关键词：Pt/Fe multilayer ; L10 PtFe ; Surface roughness ; Crystal structure ; Magnetic property
• 刊名：Applied Surface Science
• 出版年：2012
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：1 August, 2012
• 卷：258
• 期：20
• 页码：7976-7981
• 文件大小：817 K

摘要

The Fe/Pt/Fe/Pt layers (Pt/Fe multilayer) were deposited on general glass substrate at room temperature by magnetron sputtering technique. Varying the deposition and post-annealing treatment parameters, the PtFe alloy (PtFe) layer with different crystal structures and magnetic properties were obtained at the interface between Fe and Pt layer. The characterization by X-ray diffraction (XRD) showed that the as-deposited Pt/Fe multilayer only contained pure Fe and Pt with body-centered and face-centered cubic structures, respectively. As-deposited Pt layer displayed (2 0 0) preferred orientation, and the columnar grains structure could be observed by the scanning electron microscopy. The PtFe layers with L1₀ face-centered cubic structure could be formed at the interface between Pt and Fe layers by post-annealing the multilayers at 500 掳C. In case of Pt/Fe multilayer deposited on smooth substrate, the larger columnar grains in Pt layer resulted in L1₀ PtFe layers without any preferred orientation. While in case of Pt/Fe multilayer deposited on the rough substrate, the thinner columnar grains in Pt layer could induce L1₀ PtFe layers with (2 0 0) preferred orientation. In this case, the vibrating sample magnetometer results indicated that, the magnetic coercivity in plane and out-of-plane model could reach 3.72 and 2.32 kOe, respectively. Based on above results, the L1₀ structure Pt/Fe multilayer with satisfied magnetic properties could be prepared at low temperature by our simple route.