Liaw, Li JieLi JieLiawChang, Po ChunPo ChunChangChen, Po WeiPo WeiChenLiu, Zi QiZi QiLiuLiu, Shi YuShi YuLiuHsieh, Chun TseChun TseHsiehDhanarajgopal, AlltrinAlltrinDhanarajgopalMING-YAU CHERNLo, Fang YuhFang YuhLoLin, Wen ChinWen ChinLin2023-07-192023-07-192023-02-0124680230https://scholars.lib.ntu.edu.tw/handle/123456789/633971Hydrogenation-induced effects on magnetism have been widely studied because of their several potential applications. In this study, magnesium (Mg) was added to palladium (Pd)/ferromagnetic multilayers to enhance and stabilize the effects of hydrogenation. Bulk Mg is known to require high temperature and high pressure to absorb hydrogen (H). With the catalytic Pd-capping layer, Mg is confirmed to absorb H at room temperature under 1 bar H2 pressure. The magneto-optic Kerr effect of Pd/Cobalt (Co)/Mg multilayer was measured under vacuum and under 1 bar H2 pressure for comparison. The hydrogenation effect enhanced the magnetic coercivity from 25 to approximately 200 Oe irreversibly. Correspondingly, the surface roughness increased from 0.1 to 6 nm. The crystalline structure, as confirmed using X-ray diffraction, transformed from pure Mg to magnesium hydride (MgH2) after hydrogenation. These observations reveal the correlation between MgH2 formation and the magnetic properties of the Pd/Co/Mg multilayer and are valuable for the control of H-migration in spintronic devices.journal article10.1016/j.surfin.2022.1025032-s2.0-85144072481https://api.elsevier.com/content/abstract/scopus_id/85144072481