The inverse proximity effect in strong ferromagnet–superconductor structures

Yagovtsev, V. O.; Pugach, N. G.; Eschrig, Matthias

doi:10.1088/1361-6668/abc7f5

Cited by 18 publications

(7 citation statements)

References 43 publications

(113 reference statements)

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“…In typical experimental systems the superconductor is disordered, so disorder effect on pairing potential needs to be considered, see, e.g., Ref. [56]. Furthermore, in recent experiments S and F layers are separated by an intermediate spacer layer, which significantly reduces this inverse proximity effect.…”

Section: B Superconducting Transport: Scattering Matrix Approachmentioning

confidence: 99%

Supercurrent decay in ballistic magnetic Josephson junctions

Ness,

Sadovskyy,

Antipov

et al. 2021

Preprint

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We investigate the transport properties of magnetic Josephson junctions. In order to capture realistic material band structure effects, we develop a numerical method combining density functional theory and Bogoliubov-de Gennes model. We demonstrate the capabilities of this method by studying Nb/Ni/Nb junctions in the clean limit. The supercurrent through the junctions is calculated as a function of the ferromagnetic Ni thickness, magnetization, and crystal orientation. We identify two generic mechanisms for the supercurrent decay with ferromagnet thickness: (i) large exchange splitting may gap out minority or majority carriers leading to the suppression of Andreev reflection in the junction, (ii) loss of synchronization between different modes due to the significant dispersion of the quasiparticle velocity with the transverse momentum. Our results are in good agreement with recent experimental studies of Nb/Ni/Nb junctions. The present approach opens a path for material composition optimization in magnetic Josephson junctions and superconducting magnetic spin valves.

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Section: B Superconducting Transport: Scattering Matrix Approachmentioning

confidence: 99%

Supercurrent decay in ballistic magnetic Josephson junctions

Ness,

Sadovskyy,

Antipov

et al. 2021

Preprint

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show abstract

“…Earlier, we have shown that the induced magnetization almost does not depend on the precession frequency [ 29 ]. This is because the absolute value of the projection of the magnetization vector to the interface plane does not change with a change of the precession frequency and may be given by the stationary component of the induced magnetization [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

Spin dynamics in superconductor/ferromagnetic insulator hybrid structures with precessing magnetization

Turkin¹,

Pugach²

2023

Beilstein J. Nanotechnol.

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The main goal of the present work is the description of the dynamics of spin current and induced magnetization inside a superconducting film S that is in contact with a ferromagnetic insulator layer FI. Spin current and induced magnetization are calculated not only at the interface of the S/FI hybrid structure, but also inside the superconducting film. The new and interesting predicted effect is the frequency dependence of the induced magnetization with a maximum appearing at high temperatures. It is also shown that the increase of the magnetization precession frequency can drastically change the spin distribution of quasiparticles at the S/FI interface.

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“…The first plausible example of the emergence of TSC was observed in Cu x Bi 2 Se 3 during transport and spectroscopic studies. SnTe and its composites and heterostructures are more prominent candidates for potential applications such as thermoelectrics, ultralow-power dissipation spintronics and quantum computing applications [16,17] using the magnetic and superconductivity proximity effect (SCPE). Rich physics has been observed in topological materials at the TI/ferromagnetism (FM) and TI/superconductor (SC) interfaces due to spinorbit torque/spin transfer torque [18] and Rashba spin-orbit interaction [19].…”

Section: Introductionmentioning

confidence: 99%

Complex coincidence of superconducting and inverse proximity in quasi 2D nanostructured SnTe

Singh,

Saravanan,

Venkatesh

2023

Supercond. Sci. Technol.

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Inducing superconductivity in Topological insulators (TIs) and Topological crystalline insulators (TCI) is being investigated rigorously as a promising strategy to take the quantum spintronic applications to the next level. In this work, a complex interplay between topological and superconducting components is carefully tuned in such a way that an unusual coincidence of superconducting and inverse proximity is captured for the first time in electrical transport properties of Quasi 2-dimentional nanostructured SnTe contacted using “s-wave’’ superconducting electrodes. Ultralow temperature measurements in the complex superconducting proximity phase reveals two critical fields (Hc2) of 0.9T and 510 Oe. Lower Hc2 is identified to be from the superconducting electrode while the higher one is attributed to the Interface. The presence (absence) of coincidence between upper critical field (HC2) extracted from Ginzburg Landau (GL) theory and Werthamer Helfand Hohenberg (WHH) plot in normal (inverse) superconducting proximity region and concurrent crossover in correlation lengths ξ(T) and Lϕ(T) are observed to be the manifestation of robust competition between the mutual domination of different mechanisms such as topological surface states and cooper pair correlations. The current dependent MR measurements clearly demonstrate the dominant role played by an interplay between the superconducting correlations and spin-orbit coupling. Interestingly, mere doubling of contact area of superconductor is observed to simultaneously enhance the critical field to ~4 T and transition temperature to ~4.1 K in the interface region is assuring the possibility of opening-up a new gate way in nano-topological-superconducting- spintronic applications.

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The inverse proximity effect in strong ferromagnet–superconductor structures

Cited by 18 publications

References 43 publications

Supercurrent decay in ballistic magnetic Josephson junctions

Supercurrent decay in ballistic magnetic Josephson junctions

Spin dynamics in superconductor/ferromagnetic insulator hybrid structures with precessing magnetization

Complex coincidence of superconducting and inverse proximity in quasi 2D nanostructured SnTe

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