Bibliographies thématiques / CO2MPAS

Littérature scientifique sur le sujet « CO2MPAS »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "CO2MPAS"

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Ozdemir, O., A. Altındal et L. Colakerol Arslan. « Manipulation of magnetic anisotropy by voltage induced strain in Co2MnAl/PMN-PT heterostructure ». Journal of Applied Physics 132, no 10 (14 septembre 2022) : 103901. http://dx.doi.org/10.1063/5.0097912.

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We have investigated the effect of an external electric field on the magnetic properties of Co2MnAl thin films deposited on a lead magnesium niobate-lead titanate (PMN-PT) (011) substrate. Stain-induced magnetoelectric coupling affects the magnetic properties of the Co2MnAl/PMN-PT system. The piezo-strain induced by applying an external field normal to the surface induces only in-plane strain, which leads to the rotation of easy-axis orientation of Co2MnAl from [100] to [Formula: see text] direction. The remanent magnetization states and coercivity of the Co2MnAl film vary significantly and asymmetrically with the applied voltage due to anisotropic strain originating from PMN-PT. Electrical control of magnetic anisotropy in a Co2MnAl Heusler compound at room temperature will be of interest for realizing next-generation magnetoelectric random access memory devices.
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Sato, T., S. Kokado, H. Shinya, M. Tsujikawa, A. Miura, S. Kosaka, T. Ogawa, M. Shirai et M. Tsunoda. « Compositional dependence of anisotropic magnetoresistance effects in Weyl semimetal Co2MnAl Heusler alloy epitaxial thin films ». Journal of Applied Physics 132, no 22 (14 décembre 2022) : 223907. http://dx.doi.org/10.1063/5.0128562.

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Anisotropic magnetoresistance (AMR) effect on a Weyl semimetal Co2MnAl Heusler alloy was experimentally and theoretically investigated by changing the Co content, the direction of electric current against the crystal axis, and the measurement temperature. The experimentally fabricated Co2MnAl thin films epitaxially grown on a MgO single-crystal substrate showed the positive AMR ratios independent of the Co content, the direction of electric current, and the measurement temperature. The AMR ratios for the direction of electric current along Co2MnAl[100] were larger than those along Co2MnAl[110]. The maximum AMR ratios for Co2MnAl[100] were 0.576% at 5 K and 0.349% at 300 K for a Co content of 47 at. %, which is close to the stoichiometric composition. Furthermore, the theoretical calculations of AMR ratios based on the s-d scattering process of the electrons at the Fermi energy, including the information on the density of states (DOS) obtained from first-principles calculations, exhibited trends similar to the experimental results. Compared with the AMR results of Co2MnGa[110], we found that the magnitude relation between the partial DOS of the ε and γ orbitals of the d state of Co atoms determined the sign of the AMR ratios. These results suggest that the AMR effect of Weyl semimetal Co2MnAl can be elucidated by the s-d scattering process of the electrons.
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Morita, Daimu, Takuya Hara, Michihiko Yamanouchi et Tetsuya Uemura. « Deterministic field-free switching of perpendicular magnetization by spin–orbit torques originating from in-plane magnetized Co2MnAl ». AIP Advances 13, no 1 (1 janvier 2023) : 015037. http://dx.doi.org/10.1063/9.0000484.

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Spin–orbit torques (SOTs) induced magnetization switching in a perpendicularly magnetized CoFeB film deposited on a Ti/in-plane magnetized Co2MnAl stack was investigated. Deterministic switching of the CoFeB magnetization was demonstrated by applying a current pulse to the stack in a direction parallel or antiparallel to the Co2MnAl magnetization. We found that the hysteresis loops of the anomalous Hall resistance for CoFeB under the constant current is shifted in the out-of-plane magnetic field axis direction depending on the directions of both the applied current and the magnetization of Co2MnAl. The shift amount exhibits an almost linear increase as the current magnitude increases. These results are consistent with the effects caused by SOTs originating from spin currents having an in-plane polarization orthogonal to the Co2MnAl magnetization.
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Bierhance, Genaro, Anastasios Markou, Oliver Gueckstock, Reza Rouzegar, Yannic Behovits, Alexander L. Chekhov, Martin Wolf, Tom S. Seifert, Claudia Felser et Tobias Kampfrath. « Spin-voltage-driven efficient terahertz spin currents from the magnetic Weyl semimetals Co2MnGa and Co2MnAl ». Applied Physics Letters 120, no 8 (21 février 2022) : 082401. http://dx.doi.org/10.1063/5.0080308.

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Magnetic Weyl semimetals are an emerging material class that combines magnetic order and a topologically non-trivial band structure. Here, we study ultrafast optically driven spin injection from thin films of the magnetic Weyl semimetals Co2MnGa and Co2MnAl into an adjacent Pt layer by means of terahertz emission spectroscopy. We find that (i) Co2MnGa and Co2MnAl are efficient terahertz spin-current generators reaching efficiencies of typical 3d-transition-metal ferromagnets such as Fe. (ii) The relaxation of the spin current provides an estimate of the electron-spin relaxation time of Co2MnGa (170 fs) and Co2MnAl (100 fs), which is comparable to Fe (90 fs). Both observations are consistent with a simple analytical model and highlight the large potential of magnetic Weyl semimetals as spin-current sources in terahertz spintronic devices. Finally, our results provide a strategy to identify magnetic materials that offer maximum spin-current amplitudes for a given deposited optical energy density.
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Miyashita, A., M. Maekawa, Y. Shimoyama, N. Seko, A. Kawasuso et R. Y. Umetsu. « High-density magnetic-vacancy inclusion in Co2MnGa single crystal probed by spin-polarized positron annihilation spectroscopy ». Journal of Physics : Condensed Matter 34, no 4 (9 novembre 2021) : 045701. http://dx.doi.org/10.1088/1361-648x/ac3304.

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Abstract Co2MnGa is a Weyl semimetal exhibiting giant anomalous Hall and Nernst effects. Using spin-polarized positron annihilation spectroscopy, we examined a Bridgman-grown Co2MnGa single crystal with a nearly perfect L21-ordered structure and a reference Co2MnAl polycrystal with a Mn–Al-disordered B2 structure. We found that a large amount of magnetic vacancies (more than 100 ppm) were included in the Co2MnGa crystal but not the Co2MnAl crystal. We discuss possible reasons for the inclusion of vacancies, the role of vacancies in the development of the ordered structure, and the electronic states associated with the vacancies. Toward the development of Co2MnGa-based devices, the manners for reducing vacancies as well as the influence of vacancies on the electrical transport properties should be considered.
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Bosu, S., Y. Sakuraba, K. Saito, H. Wang, S. Mitani, K. Takanashi, C. Y. You et K. Hono. « Interlayer thickness dependence of 90° exchange coupling in Co2MnAl/Cr/Co2MnAl epitaxial trilayer structures ». Journal of Applied Physics 105, no 7 (avril 2009) : 07C710. http://dx.doi.org/10.1063/1.3070610.

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Li, Yang, Jihong Xia, Guangzhao Wang, Hongkuan Yuan et Hong Chen. « High-performance giant-magnetoresistance junction with B2-disordered Heusler alloy based Co2MnAl/Ag/Co2MnAl trilayer ». Journal of Applied Physics 118, no 5 (7 août 2015) : 053902. http://dx.doi.org/10.1063/1.4927834.

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Nakata, J., M. Oogane, H. Kubota, Y. Ando, H. Kato et T. Miyazaki. « Ferromagnetic Tunnel Junctions Using Co2MnAl Heusler Alloy ». Journal of the Magnetics Society of Japan 28, no 4 (2004) : 573–76. http://dx.doi.org/10.3379/jmsjmag.28.573.

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Janssens-Maenhout, G., B. Pinty, M. Dowell, H. Zunker, E. Andersson, G. Balsamo, J. L. Bézy et al. « Toward an Operational Anthropogenic CO2 Emissions Monitoring and Verification Support Capacity ». Bulletin of the American Meteorological Society 101, no 8 (1 août 2020) : E1439—E1451. http://dx.doi.org/10.1175/bams-d-19-0017.1.

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Abstract Under the Paris Agreement (PA), progress of emission reduction efforts is tracked on the basis of regular updates to national greenhouse gas (GHG) inventories, referred to as bottom-up estimates. However, only top-down atmospheric measurements can provide observation-based evidence of emission trends. Today, there is no internationally agreed, operational capacity to monitor anthropogenic GHG emission trends using atmospheric measurements to complement national bottom-up inventories. The European Commission (EC), the European Space Agency, the European Centre for Medium-Range Weather Forecasts, the European Organisation for the Exploitation of Meteorological Satellites, and international experts are joining forces to develop such an operational capacity for monitoring anthropogenic CO2 emissions as a new CO2 service under the EC’s Copernicus program. Design studies have been used to translate identified needs into defined requirements and functionalities of this anthropogenic CO2 emissions Monitoring and Verification Support (CO2MVS) capacity. It adopts a holistic view and includes components such as atmospheric spaceborne and in situ measurements, bottom-up CO2 emission maps, improved modeling of the carbon cycle, an operational data-assimilation system integrating top-down and bottom-up information, and a policy-relevant decision support tool. The CO2MVS capacity with operational capabilities by 2026 is expected to visualize regular updates of global CO2 emissions, likely at 0.05° x 0.05°. This will complement the PA’s enhanced transparency framework, providing actionable information on anthropogenic CO2 emissions that are the main driver of climate change. This information will be available to all stakeholders, including governments and citizens, allowing them to reflect on trends and effectiveness of reduction measures. The new EC gave the green light to pass the CO2MVS from exploratory to implementing phase.
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Demyan, M. S., F. Rasche, M. Schütt, N. Smirnova, E. Schulz et G. Cadisch. « Combining a coupled FTIR-EGA system and in situ DRIFTS for studying soil organic matter in arable soils ». Biogeosciences 10, no 5 (2 mai 2013) : 2897–913. http://dx.doi.org/10.5194/bg-10-2897-2013.

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Abstract. An optimized spectroscopic method combining quantitative evolved gas analysis via Fourier transform infrared spectroscopy (FTIR-EGA) in combination with a qualitative in situ thermal reaction monitoring via diffuse reflectance Fourier transform infrared spectroscopy (in situT DRIFTS) is being proposed to rapidly characterize soil organic matter (SOM) to study its dynamics and stability. A thermal reaction chamber coupled with an infrared gas cell was used to study the pattern of thermal evolution of carbon dioxide (CO2) in order to relate evolved gas (i.e., CO2) to different qualities of SOM. Soil samples were taken from three different arable sites in Germany: (i) the Static Fertilization Experiment, Bad Lauchstädt (Chernozem), from treatments of farmyard manure (FYM), mineral fertilizer (NPK), their combination (FYM + NPK) and control without fertilizer inputs; (ii) Kraichgau; and (iii) Swabian Alb (Cambisols) areas, Southwest Germany. The two latter soils were further fractionated into particulate organic matter (POM), sand and stable aggregates (Sa + A), silt and clay (Si + C), and NaOCl oxidized Si + C (rSOC) to gain OM of different inferred stabilities; respiration was measured from fresh soil samples incubated at 20 °C and 50% water holding capacity for 490 days. A variable long path length gas cell was used to record the mid-infrared absorbance intensity of CO2 (2400 to 2200 cm−1) being evolved during soil heating from 25 to 700 °C with a heating rate of 68 °C min−1 and holding time of 10 min at 700 °C. Separately, the heating chamber was placed in a diffuse reflectance chamber (DRIFTS) for measuring the mid-infrared absorbance of the soil sample during heating. Thermal stability of the bulk soils and fractions was measured via the temperature of maximum CO2 evolution (CO2max). Results indicated that the FYM + NPK and FYM treatments of the Chernozem soils had a lower CO2max as compared to both NPK and CON treatments. On average, CO2max of the Chernozem was much higher (447 °C) as compared to the Cambisol sites (Kraichgau 392 °C; Swabian Alb 384 °C). The POM fraction had the highest CO2max (477 °C), while rSOC had a first peak at 265 °C at both sites and a second peak at 392 °C for the Swabian Alb and 482 °C for the Kraichgau. The CO2max increased after 490 day incubation, while the C lost during incubation was derived from the whole temperature range but a relatively higher proportion from 200 to 350 °C. In situT DRIFTS measurements indicated decreases in vibrational intensities in the order of C-OH = unknown C vibration < C-H < −COO/C =C < C = C with increasing temperature, but interpretation of vibrational changes was complicated by changes in the spectra (i.e., overall vibrational intensity increased with temperature increase) of the sample during heating. The relative quality changes and corresponding temperatures shown by the in situT DRIFTS measurements enabled the fitting of four components or peaks to the evolved CO2 thermogram from the FTIR-EGA measurements. This gave a semi-quantitative measure of the quality of evolved C during the heating experiment, lending more evidence that different qualities of SOM are being evolved at different temperatures from 200 to 700 °C. The CO2max was influenced by long-term FYM input and also after 490 days of laboratory incubation, indicating that this measurement is an indicator for the relative overall SOM stability. The combination of FTIR-EGA and in situT DRIFTS allows for a quantitative and qualitative monitoring of thermal reactions of SOM, revealing its relative stability, and provides a sound basis for a peak fitting procedure for assigning proportions of evolved CO2 to different thermal stability components.
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Chapitres de livres sur le sujet "CO2MPAS"

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Martens, Sonja, Ronald Conze, Marco De Lucia, Jan Henninges, Thomas Kempka, Axel Liebscher, Stefan Lüth et al. « Joint Research Project CO2MAN (CO2MAN Reservoir Management) : Continuation of Research and Development Work for CO2 Storage at the Ketzin Pilot Site ». Dans Geological Storage of CO2 – Long Term Security Aspects, 1–32. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13930-2_1.

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Actes de conférences sur le sujet "CO2MPAS"

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Sofi, Shakeel Ahmad, S. Yousuf, T. M. Bhat, M. Nabi, S. Singh, Z. Saleem, S. A. Mir, Saveer A. Khandy, Ab Q. Seh et Dinesh C. Gupta. « Investigation of structural and mechanical properties of ferromagnetic Co2MnAs compound ». Dans DAE SOLID STATE PHYSICS SYMPOSIUM 2018. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5113188.

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Vinesh, A., V. D. Sudheesh, N. Lakshmi et K. Venugopalan. « B2+L21 ordering in Co2MnAl Heusler alloy ». Dans SOLID STATE PHYSICS : Proceedings of the 58th DAE Solid State Physics Symposium 2013. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4873018.

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Barwal, Vineet, Nanhe Kumar Gupta, Soumyarup Hait, Sajid Husain, Nilamani Behera et Sujeet Chaudhary. « Anisotropic gilbert damping in B2 ordered full Heusler alloy Co2MnAl thin films ». Dans DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0017134.

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Barwal, Vineet, Sajid Husain, Nilamani Behera, Ankit Kumar, Peter Svedlindh et Sujeet Chaudhary. « Growth and dynamic magnetization study of Co2MnAl full Heusler alloy thin films ». Dans 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5033119.

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