Magneto-electronic hydrogen gas sensing

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dc.contributor.authorCauser, GLen_AU
dc.contributor.authorLeung, Cen_AU
dc.contributor.authorCallori, SJen_AU
dc.contributor.authorMetaxas, Pen_AU
dc.contributor.authorKlose, Fen_AU
dc.contributor.authorKostylev, Men_AU
dc.date.accessioned2022-08-29T21:49:15Zen_AU
dc.date.available2022-08-29T21:49:15Zen_AU
dc.date.issued2017-01-31en_AU
dc.date.statistics2021-09-24en_AU
dc.description.abstractHydrogen (H2) as an energy carrier and associated H2 technologies such as fuel cells are establishing themselves as key players in the current green energy revolution. To address safety issues associated with H2, robust hydrogen gas sensors are required. We report on a superior method of using magneto-electronics to detect the presence of H2. Exploiting the strong affinity of Pd to reversibly absorb and chemically bind H2, resulting in the formation of PdH which expands the Pd lattice by up to 3%, our prototype device is based on the modification of magnetic, structural and electronic properties that occur upon hydrogenation of a Pd layer in a Pd/Co bilayer film. As H2 is absorbed by the Pd lattice, modifications to the perpendicular magnetic anisotropy (PMA) of interfacial Co moments result, leading to a variation of the ferromagnetic resonance (FMR) response of the Co layer. We report on data obtained from the first in-situ FMR polarised neutron reflectometry (PNR) measurement performed on the time-of-flight neutron reflectometer PLATYPUS at ANSTO. Here we simultaneously probed hydrogen depth profiles within Pd as a function of external H2 partial pressure (HPP), and correlated these against hydrogen induced changes to the FMR signal in the ferromagnetic layer. Decreases in the FMR field in excess of 30 Oe were observed upon H2 absorption, as a result of weakening PMA strength due to changes in interfacial electronic properties. In addition, we systematically investigated the relationship between Pd layer thickness and H2 concentration in the Pd layer in the presence of 3.5% HPP, and found that the uptake of hydrogen is severely hindered by post-deposition annealing. Although the annealing process served to remove lattice dislocations which could otherwise be occupied by H2, it led to more repeatable magnetic behaviors of the materials when measured over several H2 absorption/desorption cycles.en_AU
dc.identifier.citationCauser, G. L., Lueng, C., Callori, S. J.,Metaxas, P., Klose, F., & Kostylev, M. (2017). Magneto-electronic hydrogen gas sensing. Paper presented to the 41st Annual Condensed Matter and Materials Meeting, 31st January - 3rd February 2017 Charles Sturt University Wagga Wagga, NSW, Australia. (pp. 40). Retrieved from: https://physics.org.au/wp-content/uploads/cmm/2017/Wagga_2017_Conference_Handbook.pdfen_AU
dc.identifier.conferenceenddate3 February 2017en_AU
dc.identifier.conferencenameAustralian and New Zealand Institutes of Physics 41st Annual Condensed Matter and Materials Meetingen_AU
dc.identifier.conferenceplaceWagga Wagga, NSWen_AU
dc.identifier.conferencestartdate31 January 2017en_AU
dc.identifier.otherWA5en_AU
dc.identifier.pagination40en_AU
dc.identifier.urihttps://physics.org.au/wp-content/uploads/cmm/2017/Wagga_2017_Conference_Handbook.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13655en_AU
dc.language.isoenen_AU
dc.publisherAustralian Institute of Physicsen_AU
dc.subjectAngular momentumen_AU
dc.subjectAustralian organizationsen_AU
dc.subjectDirect energy convertersen_AU
dc.subjectElectrochemical cellsen_AU
dc.subjectElementsen_AU
dc.subjectFuel cellsen_AU
dc.subjectHydrogen isotopesen_AU
dc.subjectIsotopesen_AU
dc.subjectLight nucleien_AU
dc.subjectMagnetic resonanceen_AU
dc.subjectMeasuring instrumentsen_AU
dc.subjectMetalsen_AU
dc.subjectNucleien_AU
dc.subjectOdd-odd nucleien_AU
dc.subjectParticle propertiesen_AU
dc.subjectPhysical propertiesen_AU
dc.subjectPlatinum metalsen_AU
dc.subjectResonance scatteringen_AU
dc.subjectStandardsen_AU
dc.subjectTransition elementsen_AU
dc.titleMagneto-electronic hydrogen gas sensingen_AU
dc.typeConference Presentationen_AU
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