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*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Article number102503
JournalSurfaces and Interfaces
Volume36
DOIs
Publication statusPublished - 2023 Feb

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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