Microwave control of the superconducting proximity effect and minigap in magnetic and normal metals

Linder, Jacob; Amundsen, Morten; Ouassou, Jabir Ali

doi:10.1038/srep38739

Cited by 4 publications

(4 citation statements)

References 34 publications

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“…[216] adding Zeeman energy shifts to BCS theory results [217,218]. In the nonlinear regime, strong driving can modify the observed quasiparticle spectrum [219]. Moreover, at temperatures close to T c , exciting quasiparticles can lead to an increase of the superconducting gap ∆ [220,221,222].…”

Section: Hanle Effect In Spin-split Superconductorsmentioning

confidence: 99%

Thermal, electric and spin transport in superconductor/ferromagnetic-insulator structures

Heikkilä

Силаев

Virtanen

et al. 2019

Progress in Surface Science

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A ferromagnetic insulator (FI) attached to a conventional superconductor (S) changes drastically the properties of the latter. Specifically, the exchange field at the FI/S interface leads to a splitting of the superconducting density of states. If S is a superconducting film, thinner than the superconducting coherence length, the modification of the density of states occurs over the whole sample. The coexistence of the exchange splitting and superconducting correlations in S/FI structures leads to striking transport phenomena that are of interest for applications in thermoelectricity, superconducting spintronics and radiation sensors. Here we review the most recent progress in understanding the transport properties of FI/S structures by presenting a complete theoretical framework based on the quasiclassical kinetic equations. We discuss the coupling between the electronic degrees of freedom, charge, spin and energy, under non-equilibrium conditions and its manifestation in thermoelectricity and spin-dependent transport.

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Section: Hanle Effect In Spin-split Superconductorsmentioning

confidence: 99%

Thermal, electric and spin transport in superconductor/ferromagnetic-insulator structures

Heikkilä

Силаев

Virtanen

et al. 2019

Progress in Surface Science

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“…(3) and (4) to the second order in time-dependent field we obtain the stationary second-order correction to the Keldysh component of the GFĝ K (ε) ∝ m 2 . It consists of corrections to the spectral function analogous to those induced by the electromagnetic irradiation [56,57] and of the anomalous part [58][59][60][61]ĝ a which determines the stationary spin accumulation and thereby the nonlocal voltage in Eq. (1).…”

mentioning

confidence: 99%

Giant enhancement to spin battery effect in superconductor/ferromagnetic insulator systems

et al. 2021

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We develop a theory of the spin battery effect in superconductor/ferromagnetic insulator (SC/FI) systems taking into account the magnetic proximity effect. We demonstrate that the spin-energy mixing enabled by the superconductivity leads to the enhancement of spin accumulation by several orders of magnitude relative to the normal state. This finding can explain the recently observed giant inverse spin Hall effect generated by thermal magnons in the SC/FI system. We suggest a nonlocal electrical detection scheme which can directly probe the spin accumulation driven by the magnetization dynamics. We predict a giant Seebeck effect converting the magnon temperature bias into the nonlocal voltage signal. We also show how this can be used to enhance the sensitivity of magnon detection even up to the single-magnon level.

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“…(3)(4) to the second order in timedependent field we obtain the stationary second-order correction to the Keldysh component of the GF ĝK (ε) ∝ m 2 Ω . It consists of corrections to the spectral function analogous to those induced by the electromagnetic irradiation [57,58] and of the anomalous part [59][60][61][62] ĝa which determines the stationary spin accumulation and thereby the non-local voltage in Eq. (1).…”

mentioning

confidence: 99%

Superconductivity provides a giant enhancement to the spin battery effect

Ojajärvi,

Heikkilä,

Virtanen

et al. 2021

Preprint

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We develop a theory of the spin battery effect in superconductor/ferromagnetic insulator (SC/FI) systems taking into account the magnetic proximity effect. We demonstrate that the spin-energy mixing enabled by the superconductivity leads to the enhancement of spin accumulation by several orders of magnitude relative to the normal state. This finding can explain the recently observed giant inverse spin Hall effect generated by thermal magnons in the SC/FI system. We suggest a non-local electrical detection scheme which can directly probe the spin accumulation driven by the magnetization dynamics. We predict a giant Seebeck effect converting the magnon temperature bias into the non-local voltage signal. We also show how this can be used to enhance the sensitivity of magnon detection even up to the single-magnon level.

show abstract

Microwave control of the superconducting proximity effect and minigap in magnetic and normal metals

Cited by 4 publications

References 34 publications

Thermal, electric and spin transport in superconductor/ferromagnetic-insulator structures

Thermal, electric and spin transport in superconductor/ferromagnetic-insulator structures

Giant enhancement to spin battery effect in superconductor/ferromagnetic insulator systems

Superconductivity provides a giant enhancement to the spin battery effect

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