The Experts below are selected from a list of 38076 Experts worldwide ranked by ideXlab platform
Luiz C Sampaio - One of the best experts on this subject based on the ideXlab platform.
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vortex core magnetization dynamics induced by Thermal Excitation
Applied Physics Letters, 2012Co-Authors: Tiago S Machado, Tatiana G Rappoport, Luiz C SampaioAbstract:We investigate the effect of temperature on the dynamic properties of magnetic vortices in small disks. Our calculations use a stochastic version of the Landau-Lifshitz-Gilbert equation valid for finite temperatures well below the Curie critical temperature. We show that a finite temperature induces a vortex precession around the center of the disk, even in the absence of other Excitation sources. We discuss the origin and implications of the appearance of such dynamics. We also show that a temperature gradient plays a role similar to that of a small constant magnetic field.
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vortex core magnetization dynamics induced by Thermal Excitation
arXiv: Mesoscale and Nanoscale Physics, 2011Co-Authors: Tiago S Machado, Tatiana G Rappoport, Luiz C SampaioAbstract:We investigate the effect of temperature on the dynamic properties of magnetic vortices in small disks. Our calculations use a stochastic version of the Landau-Lifshitz-Gilbert (LLG) equation, valid for finite temperatures well below the Curie critical temperature. We show that a finite temperature induces a vortex precession around the center of the disk, even in the absence of other Excitation sources. We discuss the origin and implications of the appearance of this new dynamics. We also show that a temperature gradient plays a role similar to that of a small constant magnetic field.
Klaus Dittrich - One of the best experts on this subject based on the ideXlab platform.
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Investigations on the determination of chloride and bromide by furnace atomic non-Thermal Excitation spectrometry and furnace ionic non-Thermal Excitation spectrometry
Journal of Analytical Atomic Spectrometry, 1991Co-Authors: Klaus Dittrich, Bernard Radziuk, Bernhard WelzAbstract:The determination of chloride and bromide by non-Thermal Excitation spectrometry in a graphite furnace using both atomic and ionic spectral lines was investigated. The most sensitive determinations could be made at the ionic lines Cl II 479.545 nm and Br II 470.486 nm. The addition of an ionization buffer provided constant plasma conditions resulting in improved linearity of the calibration function. Under optimum conditions and in the presence of appropriate buffers detection limits of 0.6 ng for chloride and 2 ng for bromide were obtained.
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Determination of nitrogen and oxygen and species containing nitrogen by molecular non-Thermal Excitation spectrometry (MONES) using microwave-induced plasma (MIP) and furnace atomization non-Thermal Excitation spectrometry (FANES) sources
J. Anal. At. Spectrom., 1991Co-Authors: Klaus Dittrich, Holger Fuchs, Jean-michel Mermet, Brigitte RivièreAbstract:A microwave-induced plasma (MIP) source produced through a surface-wave propagation process (surfatron) and a furnace atomization non-Thermal Excitation spectrometry source have been used to determine N and O in gaseous and aqueous samples, respectively, through the formation and emission of NH and OH radicals. Water is removed through liquid nitrogen cold trapping and hydrogen is added to the He plasma gas. The spectral characteristics of the two sources have been compared.
Bernhard Welz - One of the best experts on this subject based on the ideXlab platform.
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Investigations on the determination of chloride and bromide by furnace atomic non-Thermal Excitation spectrometry and furnace ionic non-Thermal Excitation spectrometry
Journal of Analytical Atomic Spectrometry, 1991Co-Authors: Klaus Dittrich, Bernard Radziuk, Bernhard WelzAbstract:The determination of chloride and bromide by non-Thermal Excitation spectrometry in a graphite furnace using both atomic and ionic spectral lines was investigated. The most sensitive determinations could be made at the ionic lines Cl II 479.545 nm and Br II 470.486 nm. The addition of an ionization buffer provided constant plasma conditions resulting in improved linearity of the calibration function. Under optimum conditions and in the presence of appropriate buffers detection limits of 0.6 ng for chloride and 2 ng for bromide were obtained.
David Littlejohn - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of cold vapour furnace atomic non-Thermal Excitation spectrometry for the determination of mercury in environmental samples
Spectrochimica Acta Part B: Atomic Spectroscopy, 1992Co-Authors: Douglas C. Baxter, R. Nichol, David LittlejohnAbstract:Abstract Furnace atomic non-Thermal Excitation spectrometry (FANES) was used to determine Hg following reduction with tin(II) chloride and in situ preconcentration in the graphite tube lined with Pt gauze. Response surface methodology was used to optimize the discharge pressure and current for maximum signal-to-noise ratios. The absolute detection limit under optimum conditions was 20 pg, and the linear calibration range extended to 20 ng, limited by incomplete removal of Hg from the FANES source during one atomization sequence. Three environmental standard reference materials (SRM 1572 “Citrus leaves”, SRM 1575 “Pine needles” and SRM 1645 “River sediment”) were prepared for analysis by microwave-assisted digestion, and accurate results were obtained for the determination of Hg at the sub μg g −1 level using calibration against simple aqueous standards.
Tiago S Machado - One of the best experts on this subject based on the ideXlab platform.
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vortex core magnetization dynamics induced by Thermal Excitation
Applied Physics Letters, 2012Co-Authors: Tiago S Machado, Tatiana G Rappoport, Luiz C SampaioAbstract:We investigate the effect of temperature on the dynamic properties of magnetic vortices in small disks. Our calculations use a stochastic version of the Landau-Lifshitz-Gilbert equation valid for finite temperatures well below the Curie critical temperature. We show that a finite temperature induces a vortex precession around the center of the disk, even in the absence of other Excitation sources. We discuss the origin and implications of the appearance of such dynamics. We also show that a temperature gradient plays a role similar to that of a small constant magnetic field.
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vortex core magnetization dynamics induced by Thermal Excitation
arXiv: Mesoscale and Nanoscale Physics, 2011Co-Authors: Tiago S Machado, Tatiana G Rappoport, Luiz C SampaioAbstract:We investigate the effect of temperature on the dynamic properties of magnetic vortices in small disks. Our calculations use a stochastic version of the Landau-Lifshitz-Gilbert (LLG) equation, valid for finite temperatures well below the Curie critical temperature. We show that a finite temperature induces a vortex precession around the center of the disk, even in the absence of other Excitation sources. We discuss the origin and implications of the appearance of this new dynamics. We also show that a temperature gradient plays a role similar to that of a small constant magnetic field.
