Scanning tunneling spectroscopy of the superconducting proximity effect in a diluted ferromagnetic alloy

Crétinon, L.; Gupta, Anjan K.; Sellier, H.; Lefloch, F.; Faure, Maxime; Buzdin, Alexandre I.; Courtois, Hervé

doi:10.1103/physrevb.72.024511

Cited by 40 publications

(46 citation statements)

References 18 publications

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“…Other authors also include into consideration the existence of nonmagnetic layers at the interface of the ferromagnet and the superconductor or normal metal. 26,27,32 Thickness of the dead layer cannot be calculated quantitatively in the framework of our model and also cannot be directly estimated from the experiment. In the experiment of Weides et al, 14 the range of F layer thicknesses was rather narrow and only the first 0-transition was observed.…”

Section: ͑31͒mentioning

confidence: 99%

Properties of tunnel Josephson junctions with a ferromagnetic interlayer

et al. 2008

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We investigate superconductor/insulator/ferromagnet/superconductor tunnel Josephson junctions in the dirty limit using the quasiclassical theory. We formulate a quantitative model describing the oscillations of critical current as a function of thickness of the ferromagnetic layer and use this model to fit recent experimental data. We also calculate quantitatively the density of states ͑DOS͒ in this type of junctions and compare DOS oscillations with those of the critical current.

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Section: ͑31͒mentioning

confidence: 99%

Properties of tunnel Josephson junctions with a ferromagnetic interlayer

et al. 2008

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“…From an experimental point of view, there has been several investigations of how the spin-splitting in energy level in a ferromagnet affects the proximity effect when placed in contact with superconductor 19,20,21,22 . Very recently, SanGiorgio et al 23 reported an anomalous double peak structure in the density of states of a Nb/Ni tunneling junction.…”

Section: Introductionmentioning

confidence: 99%

Role of interface transparency and spin-dependent scattering in diffusive ferromagnet/superconductor heterostructures

2008

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We present a numerical study of the density of states in a ferromagnet/superconductor junction and the Josephson current in a superconductor/ferromagnet/superconductor junction in the diffusive limit by solving the Usadel equation with Nazarov's boundary conditions. Our calculations are valid for an arbitrary interface transparency and arbitrary spin-dependent scattering rate, which allows us to explore the entire proximity-effect regime. We first investigate how the proximity-induced anomalous Green's function affects the density of states in the ferromagnet for three magnitudes of the exchange field h compared to the superconducting gapIn each case, we consider the effect of the barrier transparency and allow for various concentrations of magnetic impurities. We clarify features that may be expected in the various parameter regimes accessible for the ferromagnetic film, with regard to thickness and exchange field. In particular, we address how the zero-energy peak and minigap observed in experiments may be understood in terms of the interplay between the singlet and triplet anomalous Green's function and their dependence on the concentration of magnetic impurities. Our results should serve as a useful tool for quantitative analysis of experimental data. We also investigate the role of the barrier transparency and spin-flip scattering in a superconductor/ferromagnet/superconductor junction. We suggest that such diffusive Josephson junctions with large residual values of the supercurrent at the 0-π transition, where the first harmonic term in the current vanishes, may be used as efficient supercurrentswitching devices. We numerically solve for the Josephson current in such a junction to clarify to what extent this idea may be realized in an experimental setup. It is also found that uniaxial spin-flip scattering has very different effect on the 0-π transition points depending on whether one regards the width-or temperaturedependence of the current. Our theory takes into account vital elements that are necessary to obtain quantitative predictions of the supercurrent in such junctions.

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“…Prior theoretical works have discussed proximity effects in misaligned homogeneous films 1,2,10,21-27 or rotating magnetizations 1,2,10,[28][29][30][31][32][33][34][35][36][37][38][39][40][41] in the clean or the diffusive limit. The results strongly depend on the choice of materials and the width of the layers.…”

Section: -20mentioning

confidence: 99%

Classification of magnetic inhomogeneities and0−πtransitions in superconducting-magnetic hybrid structures

2016

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We present a comparative study of pair correlations and currents through superconductingmagnetic hybrid systems with a particular emphasis on the tunable Bloch domain wall of an exchange spring. This study of the Gor'kov functions contrasts magnetic systems with domain walls that change at discrete points in the magnetic region with those that change continuously throughout. We present results for misaligned homogeneous magnetic multilayers, including spin valves, for discrete domain walls, as well as exchange springs and helical domain walls -such as Holmiumfor the continuous case. Introducing a rotating basis to disentangle the role of singlet and triplet correlations, we demonstrate that substantial amounts of (so-called short range) singlet correlations are generated throughout the magnetic system in a continuous domain wall via the cascade effect. We propose a classification of 0 − π transitions of the Josephson current into three types, according to the predominant pair correlations symmetries involved in the current. Properties of exchange springs for an experimental study of the proposed effects are discussed. The interplay between components of the Gor'kov function that are parallel and perpendicular to the local magnetization lead to a novel prediction about their role in a proximity system with a progressively twisting helix that is experimentally measurable.

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Scanning tunneling spectroscopy of the superconducting proximity effect in a diluted ferromagnetic alloy

Cited by 40 publications

References 18 publications

Properties of tunnel Josephson junctions with a ferromagnetic interlayer

Properties of tunnel Josephson junctions with a ferromagnetic interlayer

Role of interface transparency and spin-dependent scattering in diffusive ferromagnet/superconductor heterostructures

Classification of magnetic inhomogeneities and0−πtransitions in superconducting-magnetic hybrid structures

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