Aging dependent anomalous Hall effect in Pd(50 Å)/Co(5 Å)/Pd(54 Å)/Co(5 Å)/Pd(50 Å) multilayer with perpendicular anisotropy

Wang, C.X.; Wen, Fusheng; Zhang, F.; Lü, Y. F.; Xiang, Jianyong; Lü, Weiming; Hao, Chunxue

doi:10.1016/j.tsf.2013.07.003

Cited by 4 publications

(1 citation statement)

References 20 publications

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“…Here Reversal of the EHE polarity with composition has been reported in Co-Pd systems such as CoPd alloys, 4,8 Co/Pd multilayers [9][10][11][12][13][14] and also in other ferromagnetic alloys: NiFe, 15 TbCo 16 etc.. The split band model with two partially filled 3d bands was used 15 to explain the effect in NiFe.…”

Section: Magnetization and Ehe In Copd Alloysmentioning

confidence: 97%

Detection of hydrogen by the extraordinary Hall effect in CoPd alloys

Das

Kopnov

Gerber

2018

Journal of Applied Physics

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Aviv, 69978 Tel Aviv, Israel Effect of hydrogen adsorption on the extraordinary Hall phenomenon (EHE) in ferromagnetic CoPd films is studied as a function of composition, thickness, substrate and hydrogen concentration in atmosphere. Adsorption of hydrogen adds a positive term in the extraordinary Hall effect coefficient and modifies the perpendicular magnetic anisotropy with the respective changes in coercivity and remanence of hysteresis loops. Hydrogen sensitive compositions are within the Co concentration range 20%  x  50% with the strongest response near the EHE polarity reversal point 0~3 8%. Depending on the film composition and field of operation the EHE response of CoPd to low concentration hydrogen can reach hundreds percent, which makes the method and the material attractive for hydrogen sensing. 2 Introduction. Hydrogen is a combustible gas present in practically every chemical process. The detection and concentration measurement of hydrogen is of a paramount importance in limitless cases of human activity from chemical, metallurgical, semiconductor and nuclear power industry to the emerging hydrogen energy economy. Many types of hydrogen sensors are commercially available or are in development. Following the classification by Hübert et al 1 they can be divided in eight groups as: catalytic, thermal conductivity; electrochemical, resistance based, work function based, mechanical, optical and acoustic.Yet, there is a continued need for faster, more accurate and more selective detection of hydrogen gas. It was suggested recently 2 that accuracy and selectivity of gas detection in general and hydrogen in particular, could be improved by measuring two or more independent gas-dependent parameters, e.g. resistance and magnetization. To execute a sensitive magnetic measurement in a compact and handy apparatus it was proposed to use the extraordinary Hall effect (EHE), which is an electric replica of magnetization compatible with a standard four-probe resistance measurement. Successful implementation of the technique would enrich the gas detection arsenal by magnetic type of sensors using the spintronics effect. In this paper, we present a systematic study of hydrogen detection using the extraordinary Hall effect in thin CoPd films. Experimental.Polycrystalline CoxPd(100-x) films with Co atomic concentration x (at. %) varying over an entire range 0  x  100 were deposited by rf co-sputtering from Co and Pd targets onto room temperature glass and GaAs substrates. The base pressure prior to deposition was 5 × 10 -7 mbar. Sputtering was carried out at Ar-pressure of 5 × 10 -3 mbar. Composition of samples was controlled by rf-power of the respective sputtering sources. Co and Pd are

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Section: Magnetization and Ehe In Copd Alloysmentioning

confidence: 97%

Detection of hydrogen by the extraordinary Hall effect in CoPd alloys

Das

Kopnov

Gerber

2018

Journal of Applied Physics

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Effects of stress and defects on hydrogenation and magnetic properties in (111) fiber-textured palladium cobalt alloy films

Harumoto

Shi

Nakamura

2020

International Journal of Hydrogen Energy

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Probing Co/Pd interfacial alloying by the extraordinary Hall effect

Winer

Segal

Karpovski

et al. 2015

Journal of Applied Physics

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We report on the study of the extraordinary Hall effect (EHE) in Co-Pd alloys, bi-layers, and multilayers. Polarity of the effect and its changes with aging and post-deposition annealing are attributed to a gradual intermixing and formation of interfacial Co-Pd alloys. In multilayers with sub-monoatomic layers of Co, the intermixing is mostly accomplished during the fabrication itself. In bi-layers and multilayers with thicker Co, the process of spontaneous interfacial alloying continues after the deposition with an effective room temperature alloying period of 100 days. As far as the EHE is concerned, the stabilized Co/Pd multilayers behave as alloys with effective concentration corresponding to the thickness ratio between the Co and Pd layers.

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Aging dependent anomalous Hall effect in Pd(50 Å)/Co(5 Å)/Pd(54 Å)/Co(5 Å)/Pd(50 Å) multilayer with perpendicular anisotropy

Cited by 4 publications

References 20 publications

Detection of hydrogen by the extraordinary Hall effect in CoPd alloys

Detection of hydrogen by the extraordinary Hall effect in CoPd alloys

Effects of stress and defects on hydrogenation and magnetic properties in (111) fiber-textured palladium cobalt alloy films

Probing Co/Pd interfacial alloying by the extraordinary Hall effect

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