Spin-flip enhanced thermoelectricity in superconductor-ferromagnet bilayers

Rezaei, Ali; Kamra, Akashdeep; Machon, Peter; Belzig, Wolfgang

doi:10.1088/1367-2630/aad2a3

Cited by 15 publications

(16 citation statements)

References 64 publications

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“…For completeness, we also show the effect of spin mixing on the thermopower, i.e., the Seebeck coefficient. The results of the effect of spin-flip scattering are in line with those studied in [285].…”

Section: Effect Of Spin Mixingsupporting

confidence: 87%

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: Effect Of Spin Mixingsupporting

confidence: 87%

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

Heikkilä

Силаев

Virtanen

et al. 2019

Progress in Surface Science

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“…It limits ZT especially in heavy-metal superconductors. The associated effects were considered by Bergeret et al (2017) and Rezaei et al (2017).…”

Section: Thermoelectric Effectsmentioning

confidence: 99%

Colloquium : Nonequilibrium effects in superconductors with a spin-splitting field

et al. 2018

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We review the recent progress in understanding the properties of spin-split superconductors under non-equilibrium conditions. Recent experiments and theories demonstrate a rich variety of transport phenomena occurring in devices based on such materials that suggest direct applications in thermoelectricity, low-dissipative spintronics, radiation detection and sensing. We discuss different experimental situations and present a theoretical framework based on quantum kinetic equations. Within this framework we provide an accurate description of the non-equilibrium distribution of charge, spin and energy, which are the relevant non-equilibrium modes, in different hybrid structures. We also review experiments on spin-split superconductors and show how transport measurements reveal the properties of the non-equilibrium modes and their mutual coupling. We discuss in detail spin injection and diffusion and very large thermoelectric effects in spin-split superconductors.

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“…Recently, the idea of implementing spin-splitting through FM/SC structures has been shown to yield considerable enhancement of the thermoelectricity [29][30][31][35][36][37][38][39][40]. Such enhancement of the thermoelectricity is always useful due to the prospects of application [41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Thermoelectricity carried by proximity-induced odd-frequency pairing in ferromagnet/superconductor junctions

2020

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We explore the role of proximity-induced odd-frequency pairing in the thermoelectricity of a ferromagnet when coupled to a conventional s-wave spin-singlet superconductor through a spin-active interface. By varying both the polarization and its direction in the ferromagnet and the interfacial spin-orbit interaction strength, we analyze the behavior of all proximity-induced pair amplitudes in the ferromagnet and their contributions to the thermoelectric coefficients. Based on our results for the Seebeck coefficient, we predict that odd-frequency spin-triplet Cooper pairs are much more efficient than the conventional spin-singlet even-frequency pairs in enhancing thermoelectricity of the junction, and especially mixed-spin triplet pairing is favorable. Our results on the thermoelectric figure of merit show that ferromagnet/superconductor junctions are very good thermoelectric systems when superconductivity is dominated by odd-frequency pairing.

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Spin-flip enhanced thermoelectricity in superconductor-ferromagnet bilayers

Cited by 15 publications

References 64 publications

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

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

Colloquium : Nonequilibrium effects in superconductors with a spin-splitting field

Thermoelectricity carried by proximity-induced odd-frequency pairing in ferromagnet/superconductor junctions

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