The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform
Victor Moshchalkov - One of the best experts on this subject based on the ideXlab platform.
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Tunable and switchable Magnetic Dipole patterns in nanostructured superconductors.
Nature Communications, 2018Co-Authors: Vladimir N. Gladilin, Jacques Tempere, J. T. Devreese, Victor MoshchalkovAbstract:Design and manipulation of Magnetic moment arrays have been at the focus of studying the interesting cooperative physical phenomena in various Magnetic systems. However, long-range ordered Magnetic moments are rather difficult to achieve due to the excited states arising from the relatively weak exchange interactions between the localized moments. Here, using a nanostructured superconductor, we investigate a perfectly ordered Magnetic Dipole pattern with the Magnetic poles having the same distribution as the Magnetic charges in an artificial spin ice. The Magnetic states can simply be switched on/off by applying a current flowing through nanopatterned area. Moreover, by coupling Magnetic Dipoles with the pinned vortex lattice, we are able to erase the positive/negative poles, resulting in a Magnetic Dipole pattern of only one polarity, analogous to the recently predicted vortex ice. These switchable and tunable Magnetic Dipole patterns open pathways for the study of exotic ordering phenomena in Magnetic systems. By designing superconducting materials the behavior of supercurrents can be controlled to give different emergent behavior. Ge et al. fabricate superconducting films in which currents form geometrically frustrated Magnetic Dipoles that can be tuned further by coupling to a vortex lattice.
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Tunable and switchable Magnetic Dipole patterns in nanostructured superconductors.
Nature communications, 2018Co-Authors: Vladimir N. Gladilin, Jacques Tempere, J. T. Devreese, Victor MoshchalkovAbstract:Design and manipulation of Magnetic moment arrays have been at the focus of studying the interesting cooperative physical phenomena in various Magnetic systems. However, long-range ordered Magnetic moments are rather difficult to achieve due to the excited states arising from the relatively weak exchange interactions between the localized moments. Here, using a nanostructured superconductor, we investigate a perfectly ordered Magnetic Dipole pattern with the Magnetic poles having the same distribution as the Magnetic charges in an artificial spin ice. The Magnetic states can simply be switched on/off by applying a current flowing through nanopatterned area. Moreover, by coupling Magnetic Dipoles with the pinned vortex lattice, we are able to erase the positive/negative poles, resulting in a Magnetic Dipole pattern of only one polarity, analogous to the recently predicted vortex ice. These switchable and tunable Magnetic Dipole patterns open pathways for the study of exotic ordering phenomena in Magnetic systems.
Alejandro Hugo Corsico - One of the best experts on this subject based on the ideXlab platform.
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constraining the neutrino Magnetic Dipole moment from white dwarf pulsations
Journal of Cosmology and Astroparticle Physics, 2014Co-Authors: Alejandro Hugo Corsico, Leandro Gabriel Althaus, M Miller M Bertolami, S O Kepler, E GarciaberroAbstract:Pulsating white dwarf stars can be used as astrophysical laboratories to constrain the properties of weakly interacting particles. Comparing the cooling rates of these stars with the expected values from theoretical models allows us to search for additional sources of cooling due to the emission of axions, neutralinos, or neutrinos with Magnetic Dipole moment. In this work, we derive an upper bound to the neutrino Magnetic Dipole moment (mu(nu)) using an estimate of the rate of period change of the pulsating DB white dwarf star PG 1351+489. We employ state-of-the-art evolutionary and pulsational codes which allow us to perform a detailed asteroseismological period fit based on fully DB white dwarf evolutionary sequences. Plasmon neutrino emission is the dominant cooling mechanism for this class of hot pulsating white dwarfs, and so it is the main contributor to the rate of change of period with time ((Pi) over dot) for the DBV class. Thus, the inclusion of an anomalous neutrino emission through a non-vanishing Magnetic Dipole moment in these sequences notably influences the evolutionary timescales, and also the expected pulsational properties of the DBV stars. By comparing the theoretical ((Pi) over dot) value with the rate of change of period with time of PG 1351+489, we assess the possible existence of additional cooling by neutrinos with Magnetic Dipole moment. Our models suggest the existence of some additional cooling in this pulsating DB white dwarf, consistent with a non-zero Magnetic Dipole moment with an upper limit of mu(nu) less than or similar to 10(-11) mu(B). This bound is somewhat less restrictive than, but still compatible with, other limits inferred from the white dwarf luminosity function or from the color-magnitude diagram of the Globular cluster M5. Further improvements of the measurement of the rate of period change of the dominant pulsation mode of PG 1351+489 will be necessary to confirm our bound.
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constraining the neutrino Magnetic Dipole moment from white dwarf pulsations
arXiv: Solar and Stellar Astrophysics, 2014Co-Authors: Alejandro Hugo Corsico, Leandro Gabriel Althaus, M Miller M Bertolami, S O Kepler, E GarciaberroAbstract:Pulsating white dwarf stars can be used as astrophysical laboratories to constrain the properties of weakly interacting particles. Comparing the cooling rates of these stars with the expected values from theoretical models allows us to search for additional sources of cooling due to the emission of axions, neutralinos, or neutrinos with Magnetic Dipole moment. In this work, we derive an upper bound to the neutrino Magnetic Dipole moment using an estimate of the rate of period change of the pulsating DB white dwarf star PG 1351+489. By comparing the theoretical rate of change of period expected for this star with the rate of change of period with time of PG 1351+489, we assess the possible existence of additional cooling by neutrinos with Magnetic Dipole moment. Our models suggest the existence of some additional cooling in this pulsating DB white dwarf, consistent with a non-zero Magnetic Dipole moment. Our upper limit for the neutrino Magnetic Dipole moment is somewhat less restrictive than, but still compatible with, other limits inferred from the white dwarf luminosity function or from the color-magnitude diagram of the Globular cluster M5. Further improvements of the measurement of the rate of period change of the dominant pulsation mode of PG 1351+489 will be necessary to confirm our bound.
Vladimir N. Gladilin - One of the best experts on this subject based on the ideXlab platform.
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Tunable and switchable Magnetic Dipole patterns in nanostructured superconductors.
Nature Communications, 2018Co-Authors: Vladimir N. Gladilin, Jacques Tempere, J. T. Devreese, Victor MoshchalkovAbstract:Design and manipulation of Magnetic moment arrays have been at the focus of studying the interesting cooperative physical phenomena in various Magnetic systems. However, long-range ordered Magnetic moments are rather difficult to achieve due to the excited states arising from the relatively weak exchange interactions between the localized moments. Here, using a nanostructured superconductor, we investigate a perfectly ordered Magnetic Dipole pattern with the Magnetic poles having the same distribution as the Magnetic charges in an artificial spin ice. The Magnetic states can simply be switched on/off by applying a current flowing through nanopatterned area. Moreover, by coupling Magnetic Dipoles with the pinned vortex lattice, we are able to erase the positive/negative poles, resulting in a Magnetic Dipole pattern of only one polarity, analogous to the recently predicted vortex ice. These switchable and tunable Magnetic Dipole patterns open pathways for the study of exotic ordering phenomena in Magnetic systems. By designing superconducting materials the behavior of supercurrents can be controlled to give different emergent behavior. Ge et al. fabricate superconducting films in which currents form geometrically frustrated Magnetic Dipoles that can be tuned further by coupling to a vortex lattice.
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Tunable and switchable Magnetic Dipole patterns in nanostructured superconductors.
Nature communications, 2018Co-Authors: Vladimir N. Gladilin, Jacques Tempere, J. T. Devreese, Victor MoshchalkovAbstract:Design and manipulation of Magnetic moment arrays have been at the focus of studying the interesting cooperative physical phenomena in various Magnetic systems. However, long-range ordered Magnetic moments are rather difficult to achieve due to the excited states arising from the relatively weak exchange interactions between the localized moments. Here, using a nanostructured superconductor, we investigate a perfectly ordered Magnetic Dipole pattern with the Magnetic poles having the same distribution as the Magnetic charges in an artificial spin ice. The Magnetic states can simply be switched on/off by applying a current flowing through nanopatterned area. Moreover, by coupling Magnetic Dipoles with the pinned vortex lattice, we are able to erase the positive/negative poles, resulting in a Magnetic Dipole pattern of only one polarity, analogous to the recently predicted vortex ice. These switchable and tunable Magnetic Dipole patterns open pathways for the study of exotic ordering phenomena in Magnetic systems.
E Garciaberro - One of the best experts on this subject based on the ideXlab platform.
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constraining the neutrino Magnetic Dipole moment from white dwarf pulsations
Journal of Cosmology and Astroparticle Physics, 2014Co-Authors: Alejandro Hugo Corsico, Leandro Gabriel Althaus, M Miller M Bertolami, S O Kepler, E GarciaberroAbstract:Pulsating white dwarf stars can be used as astrophysical laboratories to constrain the properties of weakly interacting particles. Comparing the cooling rates of these stars with the expected values from theoretical models allows us to search for additional sources of cooling due to the emission of axions, neutralinos, or neutrinos with Magnetic Dipole moment. In this work, we derive an upper bound to the neutrino Magnetic Dipole moment (mu(nu)) using an estimate of the rate of period change of the pulsating DB white dwarf star PG 1351+489. We employ state-of-the-art evolutionary and pulsational codes which allow us to perform a detailed asteroseismological period fit based on fully DB white dwarf evolutionary sequences. Plasmon neutrino emission is the dominant cooling mechanism for this class of hot pulsating white dwarfs, and so it is the main contributor to the rate of change of period with time ((Pi) over dot) for the DBV class. Thus, the inclusion of an anomalous neutrino emission through a non-vanishing Magnetic Dipole moment in these sequences notably influences the evolutionary timescales, and also the expected pulsational properties of the DBV stars. By comparing the theoretical ((Pi) over dot) value with the rate of change of period with time of PG 1351+489, we assess the possible existence of additional cooling by neutrinos with Magnetic Dipole moment. Our models suggest the existence of some additional cooling in this pulsating DB white dwarf, consistent with a non-zero Magnetic Dipole moment with an upper limit of mu(nu) less than or similar to 10(-11) mu(B). This bound is somewhat less restrictive than, but still compatible with, other limits inferred from the white dwarf luminosity function or from the color-magnitude diagram of the Globular cluster M5. Further improvements of the measurement of the rate of period change of the dominant pulsation mode of PG 1351+489 will be necessary to confirm our bound.
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constraining the neutrino Magnetic Dipole moment from white dwarf pulsations
arXiv: Solar and Stellar Astrophysics, 2014Co-Authors: Alejandro Hugo Corsico, Leandro Gabriel Althaus, M Miller M Bertolami, S O Kepler, E GarciaberroAbstract:Pulsating white dwarf stars can be used as astrophysical laboratories to constrain the properties of weakly interacting particles. Comparing the cooling rates of these stars with the expected values from theoretical models allows us to search for additional sources of cooling due to the emission of axions, neutralinos, or neutrinos with Magnetic Dipole moment. In this work, we derive an upper bound to the neutrino Magnetic Dipole moment using an estimate of the rate of period change of the pulsating DB white dwarf star PG 1351+489. By comparing the theoretical rate of change of period expected for this star with the rate of change of period with time of PG 1351+489, we assess the possible existence of additional cooling by neutrinos with Magnetic Dipole moment. Our models suggest the existence of some additional cooling in this pulsating DB white dwarf, consistent with a non-zero Magnetic Dipole moment. Our upper limit for the neutrino Magnetic Dipole moment is somewhat less restrictive than, but still compatible with, other limits inferred from the white dwarf luminosity function or from the color-magnitude diagram of the Globular cluster M5. Further improvements of the measurement of the rate of period change of the dominant pulsation mode of PG 1351+489 will be necessary to confirm our bound.
Ann-marie Mårtensson-pendrill - One of the best experts on this subject based on the ideXlab platform.
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Need for remeasurements of nuclear Magnetic Dipole moments
Physical Review A, 1998Co-Authors: M. G. H. Gustavsson, Ann-marie Mårtensson-pendrillAbstract:The need for a reassessment of nuclear Magnetic Dipole moments is prompted by recent experiments on the ground-state hyperfine structure in highly charged hydrogenlike systems which are sufficiently sensitive to probe QED effects. This work gives an overview of the Magnetic Dipole moments for the nuclei of interest, i.e., ${}^{165}\mathrm{Ho},$ ${}^{185,187}\mathrm{Re},$ ${}^{203,205}\mathrm{Tl},$ ${}^{207}\mathrm{Pb},$ and ${}^{209}\mathrm{Bi}.$ It is found that the present uncertainties in the nuclear Magnetic Dipole moment limit the interpretation of the accurate experimental hyperfine structures for these systems.
