Spin-transport in superconductors

Ohnishi, Kohei; Komori, Sachio; Yang, Guang; Jeon, Kun-Rok; Olthof, L. A. B. Olde; Montiel, X.; Blamire, M. G.; Robinson, Jason W. A.

doi:10.1063/1.5138905

Cited by 32 publications

(15 citation statements)

References 63 publications

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“…Spin transport and spin dynamics in superconductors have attracted significant attention recently [1][2][3][4][5][6][7]. Quite interesting experimental results have been obtained for the spin pumping effects, which, in general, play the central role in spintronics [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Finite-frequency spin susceptibility and spin pumping in superconductors with spin-orbit relaxation

Силаев

2020

Phys. Rev. B

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Static spin susceptibility of superconductors with spin-orbit relaxation was calculated in the seminal work of Abrikosov and Gor'kov [Sov. Phys. JETP 15, 752 (1962)]. Surprisingly, the generalization of this result to finite frequencies has not been done despite being quite important for the modern topic of superconducting spintronics. The present paper fills this gap by deriving the analytical expression for spin susceptibility. The time-dependent spin response is shown to be captured by the quasiclassical Eilenberger equation with collision integrals corresponding to the ordinary and spin-orbit scattering. Using the developed formalism, we study the linear spin pumping effect between the ferromagnet and the adjacent superconducting film. The consequences for understanding recent experiments demonstrating the modification of Gilbert damping by the superconducting correlations are discussed.

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Section: Introductionmentioning

confidence: 99%

Finite-frequency spin susceptibility and spin pumping in superconductors with spin-orbit relaxation

Силаев

2020

Phys. Rev. B

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“…Besides making the superconductivity spin-polarized [6,7], such hybrid structures also give rise to odd-frequency superconductivity [8,9] where electrons are non-locally correlated in time. Although transport of charge is already dissipationless in superconductors, it is both of fundamental and practical interest to study dissipationless transport of spin via superconductors [10]. Indeed, lossless spin transport can offer new types of functionality in solid-state devices when combining superconductors with magnetic materials that charge-based transport is not capable of.…”

Section: Introductionmentioning

confidence: 99%

Quasiclassical boundary conditions for spin-orbit coupled interfaces with spin-charge conversion

Linder,

Amundsen

2021

Preprint

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The quasiclassical theory of superconductivity provides a methodology to study emergent phenomena in hybrid structures comprised of superconductors interfaced with other materials. A key component in this theory is the boundary condition that the Green functions describing the materials must satisfy. Recently, progress has been made toward formulating such a boundary condition for interfaces with spin-orbit coupling, the latter playing an important role for several phenomena in spintronics. Here, we derive a boundary condition for spin-orbit coupled interfaces that includes gradient terms which enables the description of spin-Hall like effects with superconductors due to such interfaces. As an example, we show that the boundary conditions predict that a supercurrent flowing through a superconductor that is coupled to a normal metal via a spin-orbit interface can induce a non-local magnetization in the normal metal.

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“…Superconducting spintronics is a rapidly growing research field. An important aspect is the investigation of methods for injecting angular momentum into superconducting materials to benefit from the potentially enhanced spin transport properties in superconductors [1][2][3][4][5] . First promising results include the detection of extremely long spin lifetimes 6 and large spin Hall angles (SHA) 7,8 in superconductors as well as the detection of enhanced spin transport properties in superconductor(SC)/ferromagnet(FM)-bilayers 9 .…”

Section: Introductionmentioning

confidence: 99%

Growth optimization of TaN for superconducting spintronics

Müller,

Hoepfl,

Liensberger

et al. 2021

Preprint

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We have optimized the growth of superconducting TaN thin films on SiO 2 substrates via dc magnetron sputtering and extract a maximum superconducting transition temperature of T c = 5 K as well as a maximum critical field µ 0 H c2 = (13.8 ± 0.1) T. To investigate the impact of spin-orbit interaction in superconductor/ferromagnet heterostructures, we then analyze the magnetization dynamics of both normal state and superconducting TaN/Ni 80 Fe 20 (Permalloy, Py)-bilayers as a function of temperature using broadband ferromagnetic resonance (bbFMR) spectroscopy. The phase sensitive detection of the microwave transmission signal is used to quantitatively extract the inverse current-induced torques of the bilayers. The results are compared to our previous study on NbN/Py-bilayers. In the normal state of TaN, we detect a positive damping-like current-induced torque σ d from the inverse spin Hall effect (iSHE) and a small field-like torque σ f attributed to the inverse Rashba-Edelstein effect (iREE) at the TaN/Py-interface. In the superconducting state of TaN, we detect a negative σ d attributed to the quasiparticle mediated inverse spin Hall effect (QMiSHE) and the unexpected manifestation of a large positive field-like σ f of unknown origin matching our previous results for NbN/Py-bilayers.

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Spin-transport in superconductors

Cited by 32 publications

References 63 publications

Finite-frequency spin susceptibility and spin pumping in superconductors with spin-orbit relaxation

Finite-frequency spin susceptibility and spin pumping in superconductors with spin-orbit relaxation

Quasiclassical boundary conditions for spin-orbit coupled interfaces with spin-charge conversion

Growth optimization of TaN for superconducting spintronics

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