Superconductor/Ferromagnet Hybrids: Bilayers and Spin Switching

Aarts, J.; Attanasio, C.; Bell, C. H.; Cirillo, C.; Flokstra, M. G.; Knaap, J.M. van der

doi:10.1007/978-3-642-15137-8_13

Cited by 8 publications

(4 citation statements)

References 87 publications

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“…The comparison between the different values extracted for γ b , and consequently T , appears to be more complicated as exhaustively reported in [15,32].…”

Section: Critical Temperaturesmentioning

confidence: 95%

Static and dynamic properties of the vortex lattice in superconductor/weak ferromagnet bilayers

Cirillo

Ilyina

Attanasio

2011

Supercond. Sci. Technol.

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By measuring I–V characteristics as a function of the temperature and the external magnetic field, we have analyzed the static and dynamic properties of the vortex lattice in Nb/Pd0.84Ni0.16 bilayers. In particular, the critical current density Jc for the onset of the vortex motion and the dynamic instability of the moving vortex lattice at high driving currents have been studied and compared to the results obtained in a single Nb film. We find that Jc is smaller in the bilayers than in the single superconducting film due to the smaller value of the superconducting order parameter in the bilayers. The critical velocity v* for the occurrence of the instability is larger in the S/F bilayers than in the single S layer. However, the quasiparticle energy relaxation rate extracted from v* is almost temperature-independent, implying that a different relaxation mechanism plays a role in the Nb/Pd0.84Ni0.16 bilayers.

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“…The comparison between the different values extracted for γ b , and consequently T , appears to be more complicated as exhaustively reported in [15,32].…”

Section: Critical Temperaturesmentioning

confidence: 95%

Static and dynamic properties of the vortex lattice in superconductor/weak ferromagnet bilayers

Cirillo

Ilyina

Attanasio

2011

Supercond. Sci. Technol.

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“…It is also traditionally used as a supercon ductive material in high tech devices, such as micro wave resonators for elementary particle accelerators [4,5], SQUID magnetometers [6,7], bolometers [8,9], single electron transistor [10] and fast single quantum logic [11] memory cells, cryogenic gyro scopes [12], infrared radiation photon detectors [13], and superconductor/ferromagnetic hybrid systems [14]. Most of these devices need niobium as thin films or coatings, the superconductive properties of which differ significantly from those of the bulk material.…”

Section: Introductionmentioning

confidence: 99%

Structure, texture, and properties of superconductive electrolytic niobium coatings on nickel and copper substrates

Колосов

Shevyrev²

2015

Phys. Metals Metallogr.

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Structure, texture, chemical purity, and other characteristics of superconductive niobium coatings prepared via electrochemical deposition onto nickel and copper substrates in (LiF + NaF + KF) eut + 5 wt % K 2 NbF 7 molten salt are studied. It is shown that, when depositing the coatings onto nickel, the intermediate layer of Ni 3 Nb and NiNb intermetallides is formed at the substrate-coating interface, which inhibits the diffu sion of nickel in niobium. The nickel concentration in niobium coatings above this layer is (2-7) × 10 -2 wt %. In coatings deposited onto the copper substrate the copper content does not exceed 1.5 × 10 -4 wt %, and from the viewpoint of the amount of impurities, niobium is considered as a high purity metal. The dynamics of structure modifications in niobium coatings and changes in microdeformations and dislocation density in the deposited metal are explored depending on the current density at the cathode.

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“…We stress that the magnetic properties of the PdNi alloy change with the composition, 35 so that any information on the actual composition of the magnetic layer is very relevant to the understanding of the electrodynamics data In order to clarify further the changes, we performed a detailed analysis of the compositional profile in trilayers, using the ToF-SIMS technique as described in the next Section.…”

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confidence: 99%

Robustness of the0−πtransition against compositional and structural ageing in superconductor/ferromagnetic/superconductor heterostructures

et al. 2015

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We have studied the temperature induced 0 − π thermodynamic transition in Nb/PdNi/Nb Superconductor/Ferromagnetic/Superconductor (SFS) heterostructures by microwave measurements of the superfluid density. We have observed a shift in the transition temperature with the ageing of the heterostructures, suggesting that structural and/or chemical changes took place. Motivated by the electrodynamics findings, we have extensively studied the local structural properties of the samples by means of X-ray Absorption Spectroscopy (XAS) technique, and the compositional profile by Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS). We found that the samples have indeed changed their properties, in particular for what concerns the interfaces and the composition of the ferromagnetic alloy layer. The structural and compositional data are consistent with the shift of the 0 − π transition toward the behaviour of heterostructures with different F layers. An important emerging indication to the physics of SFS is the weak relevance of the ideality of the interfaces: even in aged samples, with less-than-ideal interfaces, the temperature-induced 0 − π transition is still detectable albeit at a different critical F thickness.

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Superconductor/Ferromagnet Hybrids: Bilayers and Spin Switching

Cited by 8 publications

References 87 publications

Static and dynamic properties of the vortex lattice in superconductor/weak ferromagnet bilayers

Static and dynamic properties of the vortex lattice in superconductor/weak ferromagnet bilayers

Structure, texture, and properties of superconductive electrolytic niobium coatings on nickel and copper substrates

Robustness of the0−πtransition against compositional and structural ageing in superconductor/ferromagnetic/superconductor heterostructures

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