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

doi:10.1016/j.surfin.2022.102503

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

2 Citations (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 language	English
Article number	102503
Journal	Surfaces and Interfaces
Volume	36
DOIs	https://doi.org/10.1016/j.surfin.2022.102503
Publication status	Published - 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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10.1016/j.surfin.2022.102503

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title = "Hydrogen-induced magnetic and structural changes in Pd/Co/Mg multilayer",

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.",

author = "Liaw, {Li Jie} and Chang, {Po Chun} and Chen, {Po Wei} and Liu, {Zi Qi} and Liu, {Shi Yu} and Hsieh, {Chun Tse} and Alltrin Dhanarajgopal and Chern, {Ming Yau} and Lo, {Fang Yuh} and Lin, {Wen Chin}",

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year = "2023",

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doi = "10.1016/j.surfin.2022.102503",

language = "English",

volume = "36",

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T1 - Hydrogen-induced magnetic and structural changes in Pd/Co/Mg multilayer

AU - Liaw, Li Jie

AU - Chang, Po Chun

AU - Chen, Po Wei

AU - Liu, Zi Qi

AU - Liu, Shi Yu

AU - Hsieh, Chun Tse

AU - Dhanarajgopal, Alltrin

AU - Chern, Ming Yau

AU - Lo, Fang Yuh

AU - Lin, Wen Chin

PY - 2023/2

Y1 - 2023/2

N2 - 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.

AB - 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.

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

Abstract

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