Visualizing hydrogen diffusion in magnetic film through magneto-optical Kerr effect

Po Chun Chang; Yun Ying Chang; Wei Hsiang Wang; Fang Yuh Lo; Wen Chin Lin

doi:10.1038/s42004-019-0189-1

Visualizing hydrogen diffusion in magnetic film through magneto-optical Kerr effect

Po Chun Chang, Yun Ying Chang, Wei Hsiang Wang, Fang Yuh Lo, Wen Chin Lin^*

^*Corresponding author for this work

Department of Physics

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

17 Citations (Scopus)

Abstract

The kinematics of hydrogen diffusion in nontransparent metallic materials is crucial to the hydrogen-sensing and -storage technology and remains a challenge. Alongside the conventional optical investigations, the hydrogen absorption-induced reversible changes of magnetic properties in ferromagnetic thin films provides a new method for visualization of hydrogen in solids. Here we monitor real-time hydrogen diffusion in a cobalt-palladium alloy (Co₂₅Pd₇₅) film using a magneto-optical Kerr microscope. The spatially resolved magneto-optical contrasted images provide a noninvasive method of monitoring hydrogen movement. Hydrogen diffusion follows Fick’s diffusion law, and a diffusion coefficient of 3 ± 2 × 10⁻¹² m²/s is obtained. The diffusion velocity of the 2–4% hydrogen concentration fronts reaches 30 ± 15 nm/s in the uniform film area and increases to 50 ± 20 nm/s near a defect site. These results can be applied in detecting hydrogen diffusion in other spintronic materials, such as magnetic palladium-alloy thin films.

Original language	English
Article number	89
Journal	Communications Chemistry
Volume	2
Issue number	1
DOIs	https://doi.org/10.1038/s42004-019-0189-1
Publication status	Published - 2019 Dec 1

ASJC Scopus subject areas

Chemistry(all)
Materials Chemistry
Environmental Chemistry
Biochemistry

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title = "Visualizing hydrogen diffusion in magnetic film through magneto-optical Kerr effect",

abstract = "The kinematics of hydrogen diffusion in nontransparent metallic materials is crucial to the hydrogen-sensing and -storage technology and remains a challenge. Alongside the conventional optical investigations, the hydrogen absorption-induced reversible changes of magnetic properties in ferromagnetic thin films provides a new method for visualization of hydrogen in solids. Here we monitor real-time hydrogen diffusion in a cobalt-palladium alloy (Co25Pd75) film using a magneto-optical Kerr microscope. The spatially resolved magneto-optical contrasted images provide a noninvasive method of monitoring hydrogen movement. Hydrogen diffusion follows Fick{\textquoteright}s diffusion law, and a diffusion coefficient of 3 ± 2 × 10−12 m2/s is obtained. The diffusion velocity of the 2–4% hydrogen concentration fronts reaches 30 ± 15 nm/s in the uniform film area and increases to 50 ± 20 nm/s near a defect site. These results can be applied in detecting hydrogen diffusion in other spintronic materials, such as magnetic palladium-alloy thin films.",

author = "Chang, {Po Chun} and Chang, {Yun Ying} and Wang, {Wei Hsiang} and Lo, {Fang Yuh} and Lin, {Wen Chin}",

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AU - Lo, Fang Yuh

AU - Lin, Wen Chin

N1 - Funding Information: This study was financially supported by the Ministry of Science and Technology of Taiwan under grants nos. MOST 105-2628-M-003-001-MY3 and MOST 105-2633-M-003-001. Publisher Copyright: © 2019, The Author(s).

PY - 2019/12/1

Y1 - 2019/12/1

N2 - The kinematics of hydrogen diffusion in nontransparent metallic materials is crucial to the hydrogen-sensing and -storage technology and remains a challenge. Alongside the conventional optical investigations, the hydrogen absorption-induced reversible changes of magnetic properties in ferromagnetic thin films provides a new method for visualization of hydrogen in solids. Here we monitor real-time hydrogen diffusion in a cobalt-palladium alloy (Co25Pd75) film using a magneto-optical Kerr microscope. The spatially resolved magneto-optical contrasted images provide a noninvasive method of monitoring hydrogen movement. Hydrogen diffusion follows Fick’s diffusion law, and a diffusion coefficient of 3 ± 2 × 10−12 m2/s is obtained. The diffusion velocity of the 2–4% hydrogen concentration fronts reaches 30 ± 15 nm/s in the uniform film area and increases to 50 ± 20 nm/s near a defect site. These results can be applied in detecting hydrogen diffusion in other spintronic materials, such as magnetic palladium-alloy thin films.

AB - The kinematics of hydrogen diffusion in nontransparent metallic materials is crucial to the hydrogen-sensing and -storage technology and remains a challenge. Alongside the conventional optical investigations, the hydrogen absorption-induced reversible changes of magnetic properties in ferromagnetic thin films provides a new method for visualization of hydrogen in solids. Here we monitor real-time hydrogen diffusion in a cobalt-palladium alloy (Co25Pd75) film using a magneto-optical Kerr microscope. The spatially resolved magneto-optical contrasted images provide a noninvasive method of monitoring hydrogen movement. Hydrogen diffusion follows Fick’s diffusion law, and a diffusion coefficient of 3 ± 2 × 10−12 m2/s is obtained. The diffusion velocity of the 2–4% hydrogen concentration fronts reaches 30 ± 15 nm/s in the uniform film area and increases to 50 ± 20 nm/s near a defect site. These results can be applied in detecting hydrogen diffusion in other spintronic materials, such as magnetic palladium-alloy thin films.

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Visualizing hydrogen diffusion in magnetic film through magneto-optical Kerr effect

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