鐵鈀合金薄膜在氫化效應下旋轉磁異向性

近年來鈀金屬相關的固態材料在氫化效應下進行了廣泛的研究。與本實驗以前專注在CoxPd100-x合金不同，研究中我們著重於研究FexPd100-x合金薄膜的磁性行為，因為FexPd100-x合金這項固態材料對於氫原子的儲存時間更長，能進行更多的研究和應用。材料製成方面選擇為藍寶石基板在超高真空下利用電子束熱蒸鍍完成，在確認不同比例FexPd100-x合金薄膜下利用原子力顯微儀(AFM) 確認鐵鈀兩種鍍源的鍍率，依照不同鍍率的選定改變不同參數製備不同比例FexPd100-x合金薄膜。我們利用磁光科爾效應（MOKE）量測了各種比例的FexPd100-x合金薄膜磁性，確認了不同比例FexPd100-x合金後在真空中以及在1 bar氫氣壓力下測量磁滯曲線以進行比較。實驗結果觀察到氫化效應不僅改變了矯頑力，此落差最大來到1.3 (Oe)，甚至改變了磁異向性，氫化效應前後旋轉了磁易軸約60度，同時還確認了氫原子從FexPd100-x合金膜中的解吸時間，儲存的時間高於20小時。並且利用X射線繞射儀(XRD)確認FexPd100-x合金與藍寶石基板的晶格結構關係。這些結果對於我們弄清楚FexPd100-x合金薄膜中氫原子與磁化強度之間的關係非常重要，並將成為未來的工業上應用提供參考。

關鍵字

原子力顯微儀；磁光科爾效應；磁性量測；氫化效應

並列摘要

In recent years, the application of palladium-associated hydrogenation was widely studied for applications such as hydrogen sensors, etc. Instead of the previously reported CoxPd100-x, we focused on the magnetic property of FexPd100-x alloy films in this study, due to the much longer H-desorption time. The characterization of FexPd100-x alloy thin films with various Fe concentration was conducted by magneto-optical Kerr effect (MOKE). The hysteresis loops were measured either in vacuum or under 1 bar hydrogen gas pressure for comparison. Not only the coercivity but also the magnetic anisotropy was changed by hydrogenation. The maximum change value in coercivity under the hydrogenation came to 1.3 (Oe) and the magnetic easy axis was rotated by 60 degree. The crystal structure relation between FexPd100-x alloy films and substrate are measured by XRD. In addition, the desorption time of hydrogen from the FexPd100-x alloy films was also confirmed to be more than 20 hours. These results are important for us to determine the correlation between hydrogen and magnetization in FexPd100-x alloy thin films and will be valuable for future application.