Flux flow spin Hall effect in type-II superconductors with spin-splitting field

Vargunin, Artjom; Силаев, М. А.

doi:10.1038/s41598-019-42034-y

Cited by 15 publications

(8 citation statements)

References 75 publications

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“…The underlying physical mechanism behind the suggested electrical measurement of the Higgs mode is rooted in the strong coupling between the superconducting order parameter dynamics and electron spins. The possibility to transmit spin signals by the order parameter excitations has been elucidated using the example of mobile topological defects -Abrikosov vortices [54,55]. Here we demonstrate that time-dependent spin currents can be generated by the collective amplitude modes in superconductors.…”

mentioning

confidence: 74%

Spin currents driven by the Higgs mode in magnetic superconductors

Silaev,

Ojajärvi,

Heikkilä

2019

Preprint

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Higgs mode in superconducting materials describes slowly-decaying oscillations of the order parameter amplitude. We demonstrate that in magnetic superconductors with built-in spin-splitting field Higgs mode is strongly coupled to the spin degrees of freedom allowing for the generation of time-dependent spin currents. Converting such spin currents to electric signals by spin-filtering elements provides a tool for the second-harmonic generation and the electrical detection of the Higgs mode generated by the external irradiation. The non-adiabatic spin torques generated by these spin currents allow for the magnetic detection of the Higgs mode by measuring the precession of magnetic moment in the adjacent ferromagnet. We discuss also the reciprocal effect which is the generation of the Higgs mode by the magnetic precession. Coupling the collective modes in superconductors to light and magnetic dynamics opens the new direction of superconducting optospintronics.

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confidence: 74%

Spin currents driven by the Higgs mode in magnetic superconductors

Silaev,

Ojajärvi,

Heikkilä

2019

Preprint

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“…The underlying physical mechanism behind the suggested electrical measurement of the HM is rooted in the strong coupling between the superconducting order parameter dynamics and electron spins. The possibility to transmit spin signals by the order parameter excitations has been elucidated using the example of mobile topological defects, i.e., Abrikosov vortices [55,56]. Here we demonstrate that time-dependent spin currents can be generated by the collective amplitude modes in superconductors.…”

Section: Introductionmentioning

confidence: 72%

“…Here we suggest a different mechanism allowing electrical detection of HMs due to their coupling with spin and charge degrees of freedom in high-field superconductor/ferromagnet junctions. Unusual transport properties of such systems have attracted intense attention [34][35][36][37], stimulating both experimental [38][39][40][41][42][43][44][45][46][47] and theoretical efforts [34,[48][49][50][51][52][53][54][55][56][57].…”

Section: Introductionmentioning

confidence: 99%

Spin and charge currents driven by the Higgs mode in high-field superconductors

Силаев

Ojajärvi

Heikkilä

2020

Phys. Rev. Research

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The Higgs mode in superconducting materials describes slowly decaying oscillations of the order parameter amplitude. We demonstrate that in superconductors with a built-in spin-splitting field the Higgs mode is strongly coupled to the spin degrees of freedom, allowing for the generation of time-dependent spin currents. Converting such spin currents to electric signals by spin-filtering elements provides a tool for the second-harmonic generation and the electrical detection of the Higgs mode generated by the external irradiation. The nonadiabatic spin torques generated by these spin currents allow for the magnetic detection of the Higgs mode by measuring the precession of the magnetic moment in the adjacent ferromagnet. We discuss also the reciprocal effect, which is the generation of the Higgs mode by the magnetic precession. Coupling the collective modes in superconductors to light and magnetic dynamics provides an opportunity for the study of superconducting optospintronics.

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“…Our study demonstrates that TaN is a promising high spin-orbit coupling material for superconducting spintronics. This paves the way towards the study of a manifold of recently proposed exotic phenomena at the SC/FM-interface such as the generation of supercurrents by Rashba spin-orbit interaction 17,18 , supercurrentinduced spin-orbit torques 22 or the vortex spin Hall effect 66 .…”

Section: Discussionmentioning

confidence: 92%

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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Flux flow spin Hall effect in type-II superconductors with spin-splitting field

Cited by 15 publications

References 75 publications

Spin currents driven by the Higgs mode in magnetic superconductors

Spin currents driven by the Higgs mode in magnetic superconductors

Spin and charge currents driven by the Higgs mode in high-field superconductors

Growth optimization of TaN for superconducting spintronics

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