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García-martín Antonio - One of the best experts on this subject based on the ideXlab platform.
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Anisotropic Thermal Magnetoresistance in Radiative Heat Transfer
2020Co-Authors: García-martín AntonioAbstract:Trabajo presentado en el 6th International Conference from Nanoparticles and Nanomaterials to Nanodevices and Nanosystems (6th IC4N), celebrado en Corfu (Grecia), del 30 de junio al 3 de julio de 2019The possibility to create and manipulate nanostructured materials encouraged the exploration of new strategies to control the electromagnetic properties without the need to modify its physical structure, i.e. by means of an external agent. An approach is the combination of magneto-optically active and resonant materials (e.g. plasmonic modes), where it is feasible to control the optical properties with magnetic fields in connection to the excitation of resonances1 (magnetoplasmonics). It has been shown that these nanostructures can be employed to modulate the propagation wavevector of SPPs2 , which allows the development of label free sensors with enhanced capabilities3-5 or to enhance the magneto-optical response in isolated entities as well as films, in connection with a strong localization of the electromagnetic field.6-8 Here we will show that they also play a crucial role in the active control of thermal emission and the radiative heat transfer (RHT).9-11 In particular Near Field RHT between two MO particles can be efficiently controlled by changing the direction of the magnetic field, in the spirit of the Anisotropic Magneto Resistance in spintronics.11This phenomenon, which we term anisotropic thermal magnetoresistance (ATMR), stems from the anisotropy of the photon tunneling induced by the magnetic field. We discuss this Effect through the analysis of the radiative heat exchange between two InSb particles, and show that the ATMR can reach amplitudes of 100% for fields on the order of 1 T and up to 1000% for a magnetic field of 6 T. These values are several orders of magnitude larger than in standard spintronic devices. More importantly, this Thermomagnetic Effect paves the way for exploring heat transfer physics at pico- and even subpicosecond time scales, which are even shorter than the relaxation time of heat carriers. Moreover, we show that the heat flux is very sensitive to the magnetic field direction, which makes this Effect very promising for the development of a new generation of thermal and magnetic sensors
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Anisotropic Thermal Magnetoresistance in Radiative Heat Transfer
2020Co-Authors: García-martín AntonioAbstract:Trabajo presentado en el MRS Fall Meeting, celebrado en Boston, Massachusetts (Estados Unidos), del 1 al 6 de diciembre de 2019The possibility to create and manipulate nanostructured materials encouraged the exploration of new strategies to control the electromagnetic properties without the need to modify its physical structure, i.e. by means of an external agent. An approach is the combination of magneto-optically active and resonant materials (e.g. plasmonic modes), where it is feasible to control the optical properties with magnetic fields in connection to the excitation of resonances [1] (magnetoplasmonics). It has been shown that these nanostructures can be employed to modulate the propagation wavevector of SPPs [2], which allows the development of label free sensors with enhanced capabilities [3-5] or to enhance the magneto-optical response in isolated entities as well as films, in connection with a strong localization of the electromagnetic field [6-8]. Here we will show that they also play a crucial role in the active control of thermal emission and the radiative heat transfer (RHT) [9-11]. In particular Near Field RHT between two MO particles can be efficiently controlled by changing the direction of the magnetic field, in the spirit of the Anisotropic Magneto Resistance in spintronics [11]. This phenomenon, which we term anisotropic thermal magnetoresistance (ATMR), stems from the anisotropy of the photon tunneling induced by the magnetic field. We discuss this Effect through the analysis of the radiative heat exchange between two InSb particles, and show that the ATMR can reach amplitudes of 100% for fields on the order of 1 T and up to 1000% for a magnetic field of 6 T. These values are several orders of magnitude larger than in standard spintronic devices. More importantly, this Thermomagnetic Effect paves the way for exploring heat transfer physics at pico- and even subpicosecond time scales, which are even shorter than the relaxation time of heat carriers. Moreover, we show that the heat flux is very sensitive to the magnetic field direction, which makes this Effect very promising for the development of a new generation of thermal and magnetic sensors
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Anisotropic thermal magnetoresistance for an active control of radiative heat transfer
'American Chemical Society (ACS)', 2018Co-Authors: Ekeroth R. M. Abraham, Ben-abdallah Philippe, Cuevas J. C., García-martín AntonioAbstract:The discovery that the near-field radiative heat transfer enables to overcome the limit set by Planck’s law holds the promise to have an impact in different nanotechnologies that make use of thermal radiation, and the challenge now is to find strategies to actively control and manipulate this near-field thermal radiation. Here, we predict a huge anisotropic thermal magnetoresistance (ATMR) in the near-field radiative heat transfer between magneto-optical particles when the direction of an external magnetic field is changed with respect to the heat current direction. We illustrate this Effect with the case of two InSb particles where we find that the ATMR amplitude can reach values of up to 800% for a magnetic field of 5 T, which is many orders of magnitude larger than its spintronic analogue. This Thermomagnetic Effect could find broad applications in the field of ultrafast thermal management as well as magnetic and thermal remote sensing.We acknowledge funding from the Spanish MINECO (FIS2014-53488-P, FIS2017-84057-P and MAT2014-58860-P) and the Comunidad de Madrid (S2013/MIT-2740). P.B.-A. acknowledges funding support from the Discovery Grant Program of CRSNG and J.C.C. thanks the DFG and SFB767 for sponsoring his stay at the University of Konstanz as Mercator Fellow.Peer reviewe
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Anisotropic thermal magnetoresistance for an active control of radiative heat transfer
2017Co-Authors: Ekeroth R. M. Abraham, Ben-abdallah Philippe, Cuevas, Juan Carlos, García-martín AntonioAbstract:We predict a huge anisotropic thermal magnetoresistance (ATMR) in the near-field radiative heat transfer between magneto-optical particles when the direction of an external magnetic field is changed with respect to the heat current direction. We illustrate this Effect with the case of two InSb spherical particles where we find that the ATMR amplitude can reach values of up to 800% for a magnetic field of 5 T, which is many orders of magnitude larger than its spintronic analogue in electronic devices. This Thermomagnetic Effect could find broad applications in the fields of ultrafast thermal management as well as magnetic and thermal remote sensing.Comment: 6 pages, 4 figure
Velisa Vesovic - One of the best experts on this subject based on the ideXlab platform.
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calculation of the transport properties of carbon dioxide ii thermal conductivity and Thermomagnetic Effects
Journal of Chemical Physics, 2004Co-Authors: S Bock, Eckard Bich, E Vogel, A S Dickinson, Velisa VesovicAbstract:The transport properties of pure carbon dioxide have been calculated from the intermolecular potential using the classical trajectory method. Results are reported in the dilute-gas limit for thermal conductivity and Thermomagnetic coefficients for temperatures ranging from 200 K to 1000 K. Three recent carbon dioxide potential energy hypersurfaces have been investigated. Since thermal conductivity is influenced by vibrational degrees of freedom, not included in the rigid-rotor classical trajectory calculation, a correction for vibration has also been employed. The calculations indicate that the second-order thermal conductivity corrections due to the angular momentum polarization (<2%) and velocity polarization (<1%) are both small. Thermal conductivity values calculated using the potential energy hypersurface by Bukowski et al. (1999) are in good agreement with the available experimental data. They underestimate the best experimental data at room temperature by 1% and in the range up to 470 K by 1%–3%, depending on the data source. Outside this range the calculated values, we believe, may be more reliable than the currently available experimental data. Our results are consistent with measurements of the Thermomagnetic Effect at 300 K only when the vibrational degrees of freedom are considered fully. This excellent agreement for these properties indicates that particularly the potential surface of Bukowski et al. provides a realistic description of the anisotropy of the surface.
Dianoux Alexy - One of the best experts on this subject based on the ideXlab platform.
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Identification, optimisation en shaping of intermetallics materials for Thermomagnetic heat conversion
2018Co-Authors: Dianoux AlexyAbstract:Ce travail de thèse avait pour but de sélectionner et de mettre en forme des matériaux pour la récupération thermomagnétique de la chaleur fatale de basse énergie (T ≤ 232 °C). L’effet thermomagnétique s’explique par la variation de l’aimantation d’un matériau en fonction du champ magnétique appliqué et aussi de sa température. Cet effet permet, au travers de matériaux spécifiques, de convertir l’énergie thermique en énergie magnétique. Ce travail retient quatre types de composés intermétalliques avec des températures de Curie dans la gamme 50-150 °C. Les composés dérivés du ternaire LaFe13-χSiχ et trois séries de composés pseudobinaires Y2Fe17-xCoχ, Fe5-xMnχSn3 et Fe5-xMnχSi3. Les résultats de la littérature montrent que, pour le type LaFe13-χSiχ, la substitution du fer par le cobalt et l’hydruration du composé permettent d’élever la TC jusqu’à la gamme ciblée. Trois nuances ont été commandées au près d’Erasteel, et mises en forme par coulage en bande après mélange avec un polymère. Les autres composés ont été synthétisés au laboratoire. Les propriétés magnétiques et thermomagnétiques des composés ayant une TC dans la gamme ciblée ont été mesurées. Trois nuances de la série Y2Fe17-xCoχ ont été synthétisées en grande quantité et mises en forme par frittage naturel et par SPS. En parallèle des travaux sur les matériaux, un démonstrateur reposant sur le principe de la roue de Curie a été fabriqué. Des simulations thermiques et magnétiques complètent ce travail. Cette dernière partie montre l’importance de la thermique dans les systèmes de récupération thermomagnétique de la chaleurThis PhD work aimed to select and shape suitable materials for Thermomagnetic recovery of low energy fatal heat (T ≤ 232 °C). Thermomagnetic Effect is explained as a consequence of the magnetic field and temperature dependence of the magnetization. This Effect enables specific materials to convert heat into magnetic energy. This work laid emphasis on four types of intermetallic compounds with TC in 50-150 °C range. Derivatives compounds of LaFe13-χSiχ ternary alloy and three pseudo-binaries series Y2Fe17-xCoχ, Fe5-xMnχSn3 and Fe5-xMnχSi3. Publications show that, for LaFe13-χSiχ type, substitution of iron by cobalt and hydruration make the TC rise to the targeted range of temperature. Three nuances have been ordered to Erasteel and shaped by tape casting. All of the other compounds have been synthesized by ourself.Magnetic and Thermomagnetic properties of compounds matching the targeted temperature range were measured. We synthesised large quantity of three nuances of Y2Fe17-xCoχ and they were sintered by thermal treatment following cold compression forming or SPS direct method. A Thermomagnetic heat recovery demonstrator, relying on the Curie wheel principle, was made in the laboratory. We carried out thermal and magnetic simulations of the Thermomagnetic heat recovery system. We enlightened the paramount importance of thermal engineering for the design of Thermomagnetic heat recovery system
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Identification, optimisation et mise en forme de matériaux intermétalliques pour la conversion thermomagnétique de la chaleur
HAL CCSD, 2018Co-Authors: Dianoux AlexyAbstract:This PhD work aimed to select and shape suitable materials for Thermomagnetic recovery of low energy fatal heat (T ≤ 232 °C). Thermomagnetic Effect is explained as a consequence of the magnetic field and temperature dependence of the magnetization. This Effect enables specific materials to convert heat into magnetic energy. This work laid emphasis on four types of intermetallic compounds with TC in 50-150 °C range. Derivatives compounds of LaFe13-χSiχ ternary alloy and three pseudo-binaries series Y2Fe17-xCoχ, Fe5-xMnχSn3 and Fe5-xMnχSi3. Publications show that, for LaFe13-χSiχ type, substitution of iron by cobalt and hydruration make the TC rise to the targeted range of temperature. Three nuances have been ordered to Erasteel and shaped by tape casting. All of the other compounds have been synthesized by ourself.Magnetic and Thermomagnetic properties of compounds matching the targeted temperature range were measured. We synthesised large quantity of three nuances of Y2Fe17-xCoχ and they were sintered by thermal treatment following cold compression forming or SPS direct method. A Thermomagnetic heat recovery demonstrator, relying on the Curie wheel principle, was made in the laboratory. We carried out thermal and magnetic simulations of the Thermomagnetic heat recovery system. We enlightened the paramount importance of thermal engineering for the design of Thermomagnetic heat recovery systemsCe travail de thèse avait pour but de sélectionner et de mettre en forme des matériaux pour la récupération thermomagnétique de la chaleur fatale de basse énergie (T ≤ 232 °C). L’effet thermomagnétique s’explique par la variation de l’aimantation d’un matériau en fonction du champ magnétique appliqué et aussi de sa température. Cet effet permet, au travers de matériaux spécifiques, de convertir l’énergie thermique en énergie magnétique. Ce travail retient quatre types de composés intermétalliques avec des températures de Curie dans la gamme 50-150 °C. Les composés dérivés du ternaire LaFe13-χSiχ et trois séries de composés pseudobinaires Y2Fe17-xCoχ, Fe5-xMnχSn3 et Fe5-xMnχSi3. Les résultats de la littérature montrent que, pour le type LaFe13-χSiχ, la substitution du fer par le cobalt et l’hydruration du composé permettent d’élever la TC jusqu’à la gamme ciblée. Trois nuances ont été commandées au près d’Erasteel, et mises en forme par coulage en bande après mélange avec un polymère. Les autres composés ont été synthétisés au laboratoire. Les propriétés magnétiques et thermomagnétiques des composés ayant une TC dans la gamme ciblée ont été mesurées. Trois nuances de la série Y2Fe17-xCoχ ont été synthétisées en grande quantité et mises en forme par frittage naturel et par SPS. En parallèle des travaux sur les matériaux, un démonstrateur reposant sur le principe de la roue de Curie a été fabriqué. Des simulations thermiques et magnétiques complètent ce travail. Cette dernière partie montre l’importance de la thermique dans les systèmes de récupération thermomagnétique de la chaleu
S Bock - One of the best experts on this subject based on the ideXlab platform.
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calculation of the transport properties of carbon dioxide ii thermal conductivity and Thermomagnetic Effects
Journal of Chemical Physics, 2004Co-Authors: S Bock, Eckard Bich, E Vogel, A S Dickinson, Velisa VesovicAbstract:The transport properties of pure carbon dioxide have been calculated from the intermolecular potential using the classical trajectory method. Results are reported in the dilute-gas limit for thermal conductivity and Thermomagnetic coefficients for temperatures ranging from 200 K to 1000 K. Three recent carbon dioxide potential energy hypersurfaces have been investigated. Since thermal conductivity is influenced by vibrational degrees of freedom, not included in the rigid-rotor classical trajectory calculation, a correction for vibration has also been employed. The calculations indicate that the second-order thermal conductivity corrections due to the angular momentum polarization (<2%) and velocity polarization (<1%) are both small. Thermal conductivity values calculated using the potential energy hypersurface by Bukowski et al. (1999) are in good agreement with the available experimental data. They underestimate the best experimental data at room temperature by 1% and in the range up to 470 K by 1%–3%, depending on the data source. Outside this range the calculated values, we believe, may be more reliable than the currently available experimental data. Our results are consistent with measurements of the Thermomagnetic Effect at 300 K only when the vibrational degrees of freedom are considered fully. This excellent agreement for these properties indicates that particularly the potential surface of Bukowski et al. provides a realistic description of the anisotropy of the surface.
Ekeroth R. M. Abraham - One of the best experts on this subject based on the ideXlab platform.
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Anisotropic thermal magnetoresistance for an active control of radiative heat transfer
'American Chemical Society (ACS)', 2018Co-Authors: Ekeroth R. M. Abraham, Ben-abdallah Philippe, Cuevas J. C., García-martín AntonioAbstract:The discovery that the near-field radiative heat transfer enables to overcome the limit set by Planck’s law holds the promise to have an impact in different nanotechnologies that make use of thermal radiation, and the challenge now is to find strategies to actively control and manipulate this near-field thermal radiation. Here, we predict a huge anisotropic thermal magnetoresistance (ATMR) in the near-field radiative heat transfer between magneto-optical particles when the direction of an external magnetic field is changed with respect to the heat current direction. We illustrate this Effect with the case of two InSb particles where we find that the ATMR amplitude can reach values of up to 800% for a magnetic field of 5 T, which is many orders of magnitude larger than its spintronic analogue. This Thermomagnetic Effect could find broad applications in the field of ultrafast thermal management as well as magnetic and thermal remote sensing.We acknowledge funding from the Spanish MINECO (FIS2014-53488-P, FIS2017-84057-P and MAT2014-58860-P) and the Comunidad de Madrid (S2013/MIT-2740). P.B.-A. acknowledges funding support from the Discovery Grant Program of CRSNG and J.C.C. thanks the DFG and SFB767 for sponsoring his stay at the University of Konstanz as Mercator Fellow.Peer reviewe
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Anisotropic thermal magnetoresistance for an active control of radiative heat transfer
2017Co-Authors: Ekeroth R. M. Abraham, Ben-abdallah Philippe, Cuevas, Juan Carlos, García-martín AntonioAbstract:We predict a huge anisotropic thermal magnetoresistance (ATMR) in the near-field radiative heat transfer between magneto-optical particles when the direction of an external magnetic field is changed with respect to the heat current direction. We illustrate this Effect with the case of two InSb spherical particles where we find that the ATMR amplitude can reach values of up to 800% for a magnetic field of 5 T, which is many orders of magnitude larger than its spintronic analogue in electronic devices. This Thermomagnetic Effect could find broad applications in the fields of ultrafast thermal management as well as magnetic and thermal remote sensing.Comment: 6 pages, 4 figure
