Hydrogenation effect on uniaxial magnetic anisotropy of a Co Pd1− alloy microstructure

Mudinepalli, Venkata Ramana; Chen, Yu Chuan; Chang, Po Chun; Hsu, Chuan Che; Tsai, Chan Yi; Chiu, Hsiang Chih; Wu, Chun-Feng; Yen, Hung‐Wei; Shih, Shao Ju; Lin, Wen Chin

doi:10.1016/j.jallcom.2016.11.120

Cited by 21 publications

(5 citation statements)

References 36 publications

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“…Recently it has been demonstrated that the strength of PMA in CoPd alloy films is sensitive to the presence of H 2 [15][16][17]. Since a bulk PMA is present in these systems (rather than an interfacial PMA), one may expect that its effect on the FMR field or frequency will not drop with an increase in the thickness of the film.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of ferromagnetic resonance in PdCo alloyed films to hydrogen gas

Lueng

Lupo

Schefer

et al. 2019

International Journal of Hydrogen Energy

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In this work we studied the ferromagnetic resonance response of Co x Pd 1-x alloy samples with different cobalt contents (x = 0.65, 0.39, 0.24 & 0.14). We found significant differences in the response of the samples to the presence of hydrogen gas in the samples' environment. Two particular films (with x=0.39 and 0.24) demonstrated behaviour which is promising for application in hydrogen gas sensing. Using the Co 39 Pd 61 alloy thin film, we were able to measure hydrogen gas concentration in a very broad range (from <0.1% to 100%) at a fixed value of the external magnetic field. Finally, we demonstrate that the Co 24 Pd 76 alloy thin film is sensitive to ultra-low hydrogen gas concentrations -from 10 to 10 4 ppm.

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Section: Introductionmentioning

confidence: 99%

Sensitivity of ferromagnetic resonance in PdCo alloyed films to hydrogen gas

Lueng

Lupo

Schefer

et al. 2019

International Journal of Hydrogen Energy

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“…The evaporation rates were controlled through the adjustment of the emission currents applied to the sources. Alloy composition was determined by the deposition rates of Co and Pd and confirmed through transmission electron microscopy with energydispersive spectroscopy (TEM-EDS) [21]. A layer of polymethyl methacrylate (PMMA) was then spin-coated on the CoPd film.…”

Section: Methodsmentioning

confidence: 99%

Dependence of magnetic domain patterns on plasma-induced differential oxidation of CoPd thin films

Wang,

Liu,

Chuang

et al. 2021

Preprint

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We demonstrate the evolution of the micro-patterned magnetic domains in CoPd thin films pretreated with e-beam lithography and O 2 plasma. During the days-long oxidation, significantly different behaviors of the patterned magnetic domains under magnetization reversal are observed via magneto-optic Kerr effect microscopy on different days. The evolution of the magnetic behaviors indicate critical changes in the local magnetic anisotropy energies due to the Co oxides that evolve into different oxide forms, which are characterized by micro-area X-ray absorption spectroscopy and X-ray photoelectron spectroscopy. The coercive field of the area pre-exposed to plasma can decrease to a value 10 Oe smaller than that unexposed to plasma, whereas after a longer duration of oxidation the coercive field can instead become larger in the area pre-exposed to plasma than that unexposed, leading to an opposite magnetic pattern. Various forms of oxidation can therefore provide an additional dimension for magnetic-domain engineering to the current conventional lithographies.

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“…However, several other physical factors were identified to be responsible for this effect. Firstly, absorption of H 2 modifies the electronic structure of the Co-Pd system, thereby changing the magnetic environment of the atoms and eventually reducing the strength of PMA [20,160]. A plausible physical origin of this effect is a change in the Co-Pd orbital hybridisation [161] caused by hydrogen ions [107].…”

Section: Nickel-cobalt-palladium Alloy Magneto-electronic Sensorsmentioning

confidence: 99%

Magneto-Electronic Hydrogen Gas Sensors: A Critical Review

Maksymov

Kostylev

2022

Chemosensors

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Devices enabling early detection of low concentrations of leaking hydrogen and precision measurements in a wide range of hydrogen concentrations in hydrogen storage systems are essential for the mass-production of fuel-cell vehicles and, more broadly, for the transition to the hydrogen economy. Whereas several competing sensor technologies are potentially suitable for this role, ultra-low fire-hazard, contactless and technically simple magneto-electronic sensors stand apart because they have been able to detect the presence of hydrogen gas in a range of hydrogen concentrations from 0.06% to 100% at atmospheric pressure with the response time approaching the industry gold standard of one second. This new kind of hydrogen sensors is the subject of this review article, where we inform academic physics, chemistry, material science and engineering communities as well as industry researchers about the recent developments in the field of magneto-electronic hydrogen sensors, including those based on magneto-optical Kerr effect, anomalous Hall effect and Ferromagnetic Resonance with a special focus on Ferromagnetic Resonance (FMR)-based devices. In particular, we present the physical foundations of magneto-electronic hydrogen sensors and we critically overview their advantages and disadvantages for applications in the vital areas of the safety of hydrogen-powered cars and hydrogen fuelling stations as well as hydrogen concentration meters, including those operating directly inside hydrogen-fuelled fuel cells. We believe that this review will be of interest to a broad readership, also facilitating the translation of research results into policy and practice.

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Hydrogenation effect on uniaxial magnetic anisotropy of a Co Pd1− alloy microstructure

Cited by 21 publications

References 36 publications

Sensitivity of ferromagnetic resonance in PdCo alloyed films to hydrogen gas

Sensitivity of ferromagnetic resonance in PdCo alloyed films to hydrogen gas

Dependence of magnetic domain patterns on plasma-induced differential oxidation of CoPd thin films

Magneto-Electronic Hydrogen Gas Sensors: A Critical Review

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