Microwave Properties of Nb/PdNi/Nb Trilayers

Torokhtii, Kostiantyn; Pompeo, Nicola; Meneghini, Carlo; Attanasio, C.; Cirillo, C.; Ilyina, E. A.; Sarti, S.; Silva, Enrico

doi:10.1007/s10948-012-1795-7

Cited by 12 publications

(8 citation statements)

References 15 publications

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“…Below we present theoretical description consistent with available flux-flow resistivity data for SFS 17 and discuss low-field flux-flow resistivity experiment, where resisitivity of SFS is proportional to the vortex density in agreement with Bardeen-Stephen theory. We argue that in the π-state the relevant numeric proportionality coefficient exhibits universal h-independent behaviour providing a way to distinguish between the 0 and π state of SFS by single flux-flow resisitivity measurement.…”

Section: Superconductor-ferromagnet-superconductorsupporting

confidence: 61%

Magnetic field-controlled −π transitions and their experimental signatures in superconductor-ferromagnet-superconductor junctions

Vargunin

Силаев

2020

Applied Physics Letters

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Superconductor-ferromagnet-superconductor Josephson junctions are known to exist in the 0 and π states with the transitions between them controlled by the temperature and ferromagnetic interlayer thickness. We demonstrate that these transitions can be controlled also by the external magnetic field directed perpendicular to the layers. By varying the ratio of diffusion coefficients in superconducting and ferromagnetic layers, these field-controlled transitions can be made detectable for arbitrary large value of the exchange energy in the ferromagnet. We also show that the 0-π transitions in the perpendicular field can be observed as the specific features of the flux-flow conductivity dependencies on the ferromagnetic thickness in accordance with recent experimental results.

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Section: Superconductor-ferromagnet-superconductorsupporting

confidence: 61%

Magnetic field-controlled −π transitions and their experimental signatures in superconductor-ferromagnet-superconductor junctions

Vargunin

Силаев

2020

Applied Physics Letters

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“…Thus, for (ω − ω F )/ω F ≪ 1 the thickness d may be of the order of or larger than the domain wall width. Finally, we will discuss briefly a recent paper by Torokhtii et al, 21 where the flux-flow resistivity in Nb/PdNi/Nb trilayers has been measured. It has been reported that in the presence of the magnetic PdNi layer the flux-flow resistivity in Nb exceeds the Bardeen-Stephen estimate, 33 as if the vortex viscosity is reduced by the interaction with magnetic moments.…”

Section: Magnon Excitation In Sfmentioning

confidence: 94%

“…Experimentally, the oscillating current in the superconductor can be created using the microwave technique (for example, see Ref. 21). Then, the surface impedance yields information about the high-frequency properties of the sample -see Sec.…”

Section: Magnon Radiation By a Harmonically Oscillating Vortex Lamentioning

confidence: 99%

Magnon radiation by moving Abrikosov vortices in ferromagnetic superconductors and superconductor-ferromagnet multilayers

2014

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In systems combining type-II superconductivity and magnetism the non-stationary magnetic field of moving Abrikosov vortices may excite spin waves, or magnons. This effect leads to the appearance of an additional damping force acting on the vortices. By solving the London and Landau-Lifshitz-Gilbert equations we calculate the magnetic moment induced force acting on vortices in ferromagnetic superconductors and superconductor/ferromagnet superlattices. If the vortices are driven by a dc force, magnon generation due to the Cherenkov resonance starts as the vortex velocity exceeds some threshold value. For an ideal vortex lattice this leads to an anisotropic contribution to the resistivity and to the appearance of resonance peaks on the current voltage characteristics. For a disordered vortex array the current will exhibit a step-like increase at some critical voltage. If the vortices are driven by an ac force with a frequency ω, the interaction with magnetic moments will lead to a frequency-dependent magnetic contribution ηM to the vortex viscosity. If ω is below the ferromagnetic resonance frequency ωF , vortices acquire additional inertia. For ω > ωF dissipation is enhanced due to magnon generation. The viscosity ηM can be extracted from the surface impedance of the ferromagnetic superconductor. Estimates of the magnetic force acting on vortices for the U-based ferromagnetic superconductors and cuprate/manganite superlattices are given.

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“…However, additional phenomena arise in the flux-flow resistivity with increasing d F . In Figure 5(e) we report the plateau resistivity of the normalized curves ρ v1 (f )/ρ n , that is an experimental measure of ρ ff , as a function of d F and at the same reduced temperature T/T c ≃ 0.86 and reduced field H/H c2 ≃ 0.5 [45]. It is immediately seen that, when the effect of the fer-romagnetic layer becomes appreciable, the fluxflow resistivity increases and exceeds the Bardeen-Stephen value.…”

Section: Microwave Vortex Response In S/f/s Heterostructuresmentioning

confidence: 99%

8. Vortices at microwave frequencies

Silva,

Pompeo,

Dobrovolskiy

2017

Superconductors at the Nanoscale

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The behavior of vortices at microwave frequencies is an extremely useful source of information on the microscopic parameters that enter the description of the vortex dynamics. This feature has acquired particular relevance since the discovery of unusual superconductors, such as cuprates. Microwave investigation then extended its field of application to many families of superconductors, including the artificially nanostructured materials. It is then important to understand the basics of the physics of vortices moving at high frequency, as well as to understand what information the experiments can yield (and what they can not). The aim of this brief review is to introduce the readers to some basic aspects of the physics of vortices under a microwave electromagnetic field, and to guide them to an understanding of the experiment, also by means of the illustration of some relevant results.

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Microwave Properties of Nb/PdNi/Nb Trilayers

Cited by 12 publications

References 15 publications

Magnetic field-controlled −π transitions and their experimental signatures in superconductor-ferromagnet-superconductor junctions

Magnetic field-controlled −π transitions and their experimental signatures in superconductor-ferromagnet-superconductor junctions

Magnon radiation by moving Abrikosov vortices in ferromagnetic superconductors and superconductor-ferromagnet multilayers

8. Vortices at microwave frequencies

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