Hydrogen-induced magnetic and structural changes in Pd/Co/Mg multilayer

Li Jie Liaw, Po Chun Chang, Po Wei Chen, Zi Qi Liu, Shi Yu Liu, Chun Tse Hsieh, Alltrin Dhanarajgopal, Ming Yau Chern, Fang Yuh Lo, Wen Chin Lin*

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

1 引文 斯高帕斯(Scopus)

摘要

Hydrogenation-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.

原文英語
文章編號102503
期刊Surfaces and Interfaces
36
DOIs
出版狀態已發佈 - 2023 2月

ASJC Scopus subject areas

  • 一般化學
  • 凝聚態物理學
  • 一般物理與天文學
  • 表面和介面
  • 表面、塗料和薄膜

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