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

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

doi:10.1016/j.surfin.2022.102503

Cited by 2 publications

(4 citation statements)

References 32 publications

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“…In the previously reported XRD data of hydrogenated Pd/Co/Mg/Al 2 O 3 (0001), initially the pure Mg(0004) peak at 34.4° was visible. After hydrogenation, the Mg(0004) peak disappeared and was replaced by the MgH 2 (200) phase at 40.3°.…”

Section: Resultsmentioning

confidence: 73%

“…No pure Mg peak was recorded after 1 bar hydrogen exposure, which is consistent with previous studies and indicates that the hydrogen exposure caused hydrogenation of the Mg layer. 33 Moreover, MgH 2 was detected in the sample stored in a chamber with a base pressure of 5 × 10 −5 mbar after 2 months, indicating that Mg can effectively be used to store hydrogen at RT for a long duration. Studies have demonstrated that hydrogenation affects the optical properties of some hydride materials such as MgH 2.…”

Section: ■ Experimental Resultsmentioning

confidence: 94%

“…The XRD results of the hydrogenate sample, where the peaks at 40.3, 41.8, and 44.5° represent the MgH 2 (002), Al 2 O 3 (0006), and Co(002) phases, respectively, are presented in Figure 2 c. No pure Mg peak was recorded after 1 bar hydrogen exposure, which is consistent with previous studies and indicates that the hydrogen exposure caused hydrogenation of the Mg layer. 33 Moreover, MgH 2 was detected in the sample stored in a chamber with a base pressure of 5 × 10 –5 mbar after 2 months, indicating that Mg can effectively be used to store hydrogen at RT for a long duration. Studies have demonstrated that hydrogenation affects the optical properties of some hydride materials such as MgH 2.…”

Section: Resultsmentioning

confidence: 95%

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Hydrogenation Effect on Interlayer Coupling and Magneto-Transport Properties of Pd/Co/Mg/Fe Multilayers

et al. 2023

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Hydrogenation-induced modification of magnetic properties has been widely studied. A Mg spacer layer with high hydrogen storage stability was clamped in a Pd/Co/Mg/Fe multilayer structure to enhance its hydrogen storage stability and explore the structure’s magneto-transport properties. After 1 bar hydrogen exposure, the formation of a stable MgH2 phase was demonstrated in an ambient environment at room temperature through X-ray diffraction. Lower magnetic coupling and enhanced magnetoresistance, compared to those of the as-grown sample, were observed using the longitudinal magneto-optical Kerr effect and a four-probe measurement. In this study, the hydrogenation stability of ferromagnetic multilayers was improved, and the concept of a hydrogenation-based spintronic device was developed.

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Section: Resultsmentioning

confidence: 73%

Section: ■ Experimental Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 95%

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Hydrogenation Effect on Interlayer Coupling and Magneto-Transport Properties of Pd/Co/Mg/Fe Multilayers

et al. 2023

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“…In pure metals, hydrogen bonds in the following general ways: at low concentrations, hydrogenation causes lattice expansion; at intermediate concentrations, hydrogen atoms form complexes with material atoms; and at high concentrations, hydrogen injection results in a large number of defects in the material [9]. Important factors influencing hydrogen distribution for nanoscale multilayer materials include the presence of interfaces where considerable amounts of hydrogen might concentrate [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen-Induced Microstructure Changes in Zr/Nb Nanoscale Multilayer Structures

Laptev,

Stepanova,

Lomygin

et al. 2024

Metals

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Zr/Nb nanoscale multilayer coatings (NMCs) were studied after hydrogenation in a gaseous environment at 400 °C. The hydrogen distribution and content were determined by pressure and hydrogenation time. Increasing the pressure from 0.2 to 2 MPa resulted in different hydrogen distribution within the Zr/Nb NMCs, while the concentration remained constant at 0.0150 ± 0.0015 wt. %. The hydrogen concentration increased from 0.0165 ± 0.001 to 0.0370 ± 0.0015 wt. % when the hydrogenation time was extended from 1 to 7 h. The δ-ZrH hydride phase was formed in the Zr layers with Zr crystals reorienting towards the [100] direction. The Nb(110) diffraction reflex shifted towards smaller angles and the interplanar distance in the niobium layers increased, indicating significant lateral compressive stresses. Despite an increase in pressure, the nanohardness and Young’s modulus of the Zr/Nb NMCs remained stable. Increasing the hydrogen concentration to 0.0370 ± 0.0015 wt. % resulted in a 40% increase in nanohardness. At this concentration, the relative values of the Doppler broadening variable energy positron annihilation spectroscopy (S/S0) increased above the initial level, indicating an increase in excess free volume due to hydrogen-induced defects and changes. However, the predominant positron capture center remained intact. The Zr/Nb NMCs with hydrogen content ranging from 0.0150 ± 0.0015 to 0.0180 ± 0.001 wt. % exhibited a decrease in the free volume probed by positrons, as demonstrated by the Doppler broadening variable energy positron annihilation spectroscopy. This was evidenced by opposite changes in S and W (S↓W↑). The microstructural changes are attributed to defect annihilation during hydrogen accumulation near interfaces with the formation of hydrogen–vacancy clusters and hydrides.

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

Cited by 2 publications

References 32 publications

Hydrogenation Effect on Interlayer Coupling and Magneto-Transport Properties of Pd/Co/Mg/Fe Multilayers

Hydrogenation Effect on Interlayer Coupling and Magneto-Transport Properties of Pd/Co/Mg/Fe Multilayers

Hydrogen-Induced Microstructure Changes in Zr/Nb Nanoscale Multilayer Structures

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