The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Burkard Hillebrands - One of the best experts on this subject based on the ideXlab platform.
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Spin-wave propagation through a magnonic crystal in a Thermal Gradient
Journal of Physics D, 2018Co-Authors: Thomas Langner, Dmytro A. Bozhko, Sergiy A Bunyaev, G. N. Kakazei, Andrii V. Chumak, Alexander A. Serga, Burkard Hillebrands, Vitaliy I. VasyuchkaAbstract:The properties of a magnonic crystal are expected to be strongly influenced by the presence of a Thermal Gradient. We investigated the propagation of backward volume and surface magnetostatic spin-waves in a 1D magnonic crystal (MC) exposed to a continuous spatial temperature Gradient. It is shown that the Thermal Gradient applied along the propagation direction leads to a frequency shift and a modification of the transmission characteristics of the spin-waves. The frequency shift is caused by a variation in saturation magnetization due to the change in absolute temperature. The altered transmission manifests itself in a broadening of MC band gaps and the corresponding narrowing of the MC passbands and is understood to be a result of a spatial transformation of the spin-waves wavelengths in a Thermal Gradient. Furthermore, the transmission characteristics of spin-waves in a Thermal Gradient have been verified by numerical calculations based on the approach of the transmission matrix. The results of the calculations demonstrate a good agreement with the experimentally measured data.
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spin wave propagation and transformation in a Thermal Gradient
Applied Physics Letters, 2012Co-Authors: Bjorn Obry, Andrii V. Chumak, Alexander A. Serga, Vitaliy I. Vasyuchka, Burkard HillebrandsAbstract:The influence of a Thermal Gradient on the propagation properties of externally excited dipolar spin waves in a magnetic insulator waveguide is investigated. It is shown that spin waves propagating towards a colder region along the magnetization direction continuously reduce their wavelength. The wavelength increase of a wave propagating into a hotter region was utilized to realize its decomposition in the partial waveguide modes which are reflected at different locations. This influence of temperature on spin-wave properties is mainly caused by a change in the saturation magnetization and yields promising opportunities for the manipulation of spin waves in spin-caloritronic applications.
Bjorn Obry - One of the best experts on this subject based on the ideXlab platform.
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spin wave propagation and transformation in a Thermal Gradient
Applied Physics Letters, 2012Co-Authors: Bjorn Obry, Andrii V. Chumak, Alexander A. Serga, Vitaliy I. Vasyuchka, Burkard HillebrandsAbstract:The influence of a Thermal Gradient on the propagation properties of externally excited dipolar spin waves in a magnetic insulator waveguide is investigated. It is shown that spin waves propagating towards a colder region along the magnetization direction continuously reduce their wavelength. The wavelength increase of a wave propagating into a hotter region was utilized to realize its decomposition in the partial waveguide modes which are reflected at different locations. This influence of temperature on spin-wave properties is mainly caused by a change in the saturation magnetization and yields promising opportunities for the manipulation of spin waves in spin-caloritronic applications.
Vitaliy I. Vasyuchka - One of the best experts on this subject based on the ideXlab platform.
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Spin-wave propagation through a magnonic crystal in a Thermal Gradient
Journal of Physics D, 2018Co-Authors: Thomas Langner, Dmytro A. Bozhko, Sergiy A Bunyaev, G. N. Kakazei, Andrii V. Chumak, Alexander A. Serga, Burkard Hillebrands, Vitaliy I. VasyuchkaAbstract:The properties of a magnonic crystal are expected to be strongly influenced by the presence of a Thermal Gradient. We investigated the propagation of backward volume and surface magnetostatic spin-waves in a 1D magnonic crystal (MC) exposed to a continuous spatial temperature Gradient. It is shown that the Thermal Gradient applied along the propagation direction leads to a frequency shift and a modification of the transmission characteristics of the spin-waves. The frequency shift is caused by a variation in saturation magnetization due to the change in absolute temperature. The altered transmission manifests itself in a broadening of MC band gaps and the corresponding narrowing of the MC passbands and is understood to be a result of a spatial transformation of the spin-waves wavelengths in a Thermal Gradient. Furthermore, the transmission characteristics of spin-waves in a Thermal Gradient have been verified by numerical calculations based on the approach of the transmission matrix. The results of the calculations demonstrate a good agreement with the experimentally measured data.
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spin wave propagation and transformation in a Thermal Gradient
Applied Physics Letters, 2012Co-Authors: Bjorn Obry, Andrii V. Chumak, Alexander A. Serga, Vitaliy I. Vasyuchka, Burkard HillebrandsAbstract:The influence of a Thermal Gradient on the propagation properties of externally excited dipolar spin waves in a magnetic insulator waveguide is investigated. It is shown that spin waves propagating towards a colder region along the magnetization direction continuously reduce their wavelength. The wavelength increase of a wave propagating into a hotter region was utilized to realize its decomposition in the partial waveguide modes which are reflected at different locations. This influence of temperature on spin-wave properties is mainly caused by a change in the saturation magnetization and yields promising opportunities for the manipulation of spin waves in spin-caloritronic applications.
Bruce K Gale - One of the best experts on this subject based on the ideXlab platform.
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product differentiation during continuous flow Thermal Gradient pcr
Lab on a Chip, 2008Co-Authors: Niel D Crews, Carl T Wittwer, Robert Palais, Bruce K GaleAbstract:A continuous-flow PCR microfluidic device was developed in which the target DNA product can be detected and identified during its amplification. This in situ characterization potentially eliminates the requirement for further post-PCR analysis. Multiple small targets have been amplified from human genomic DNA, having sizes of 108, 122, and 134 bp. With a DNA dye in the PCR mixture, the amplification and unique melting behavior of each sample is observed from a single fluorescent image. The melting behavior of the amplifying DNA, which depends on its molecular composition, occurs spatially in the Thermal Gradient PCR device, and can be observed with an optical resolution of 0.1°C pixel−1. Since many PCR cycles are within the field of view of the CCD camera, melting analysis can be performed at any cycle that contains a significant quantity of amplicon, thereby eliminating the cycle-selection challenges typically associated with continuous-flow PCR microfluidics.
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continuous flow Thermal Gradient pcr
Biomedical Microdevices, 2008Co-Authors: Niel D Crews, Carl T Wittwer, Bruce K GaleAbstract:Continuous-flow Thermal Gradient PCR is a new DNA amplification technique that is characterized by periodic temperature ramping with no cyclic hold times. The device reported in this article represents the first demonstration of hold-less thermocycling within continuous-flow PCR microfluidics. This is also the first design in which continuous-flow PCR is performed within a single steady-state temperature zone. This allows for straightforward miniaturization of the channel footprint, shown in this device which has a cycle length of just 2.1 cm. With a linear Thermal Gradient established across the glass device, the heating and cooling ramp rates are dictated by the fluid velocity relative to the temperature Gradient. Local channel orientation and cross-sectional area regulate this velocity. Thus, rapid thermocycling occurs while the PCR chip is maintained at steady state temperatures and flow rates. Glass PCR chips (25 × 75 × 2 mm) of both 30 and 40 serpentine cycles have been fabricated, and were used to amplify a variety of targets, including a 181-bp segment of a viral phage DNA (ΦX174) and a 108-bp segment of the Y-chromosome, amplified from human genomic DNA. With this unique combination of hold-less cycling and Gradient temperature ramping, a 40-cycle PCR requires less than 9 min, with the resulting amplicon having high yield and specificity.
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Thermal Gradient PCR in a Continuous-Flow Microchip
Microfluidics BioMEMS and Medical Microsystems V, 2007Co-Authors: Niel D Crews, Carl T Wittwer, Bruce K GaleAbstract:A new continuous-flow PCR microchip has been developed that operates by cycling a prepared sample within a spatial temperature Gradient. This design allows for minimal Thermal residence times – a key feature of the protocols used by the fastest commercial PCR equipment. Since Thermal Gradients are a natural effect of heat dissipation, the appropriate temperature distribution for PCR can be generated by a minimum of one heater held at a steady state temperature. With a Thermal Gradient of more than 3°C/mm across the width of the chip, each complete PCR cycle requires approximately 2cm of channel length. These glass chips were manufactured using standard glass microfabrication methods as well as the Xurographic rapid prototyping technique. Targets of 110bp and 181bp were amplified from ΦX174 plasmid DNA on these Thermal Gradient chips as well as on commercial PCR equipment, then subsequently analyzed by gel electrophoresis. Visual inspection of fluorescent images of the stained gels shows that the amplicon size and yield for the systems are comparable.
Andrii V. Chumak - One of the best experts on this subject based on the ideXlab platform.
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Spin-wave propagation through a magnonic crystal in a Thermal Gradient
Journal of Physics D, 2018Co-Authors: Thomas Langner, Dmytro A. Bozhko, Sergiy A Bunyaev, G. N. Kakazei, Andrii V. Chumak, Alexander A. Serga, Burkard Hillebrands, Vitaliy I. VasyuchkaAbstract:The properties of a magnonic crystal are expected to be strongly influenced by the presence of a Thermal Gradient. We investigated the propagation of backward volume and surface magnetostatic spin-waves in a 1D magnonic crystal (MC) exposed to a continuous spatial temperature Gradient. It is shown that the Thermal Gradient applied along the propagation direction leads to a frequency shift and a modification of the transmission characteristics of the spin-waves. The frequency shift is caused by a variation in saturation magnetization due to the change in absolute temperature. The altered transmission manifests itself in a broadening of MC band gaps and the corresponding narrowing of the MC passbands and is understood to be a result of a spatial transformation of the spin-waves wavelengths in a Thermal Gradient. Furthermore, the transmission characteristics of spin-waves in a Thermal Gradient have been verified by numerical calculations based on the approach of the transmission matrix. The results of the calculations demonstrate a good agreement with the experimentally measured data.
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spin wave propagation and transformation in a Thermal Gradient
Applied Physics Letters, 2012Co-Authors: Bjorn Obry, Andrii V. Chumak, Alexander A. Serga, Vitaliy I. Vasyuchka, Burkard HillebrandsAbstract:The influence of a Thermal Gradient on the propagation properties of externally excited dipolar spin waves in a magnetic insulator waveguide is investigated. It is shown that spin waves propagating towards a colder region along the magnetization direction continuously reduce their wavelength. The wavelength increase of a wave propagating into a hotter region was utilized to realize its decomposition in the partial waveguide modes which are reflected at different locations. This influence of temperature on spin-wave properties is mainly caused by a change in the saturation magnetization and yields promising opportunities for the manipulation of spin waves in spin-caloritronic applications.
