Magnetoelectric effects in superconductor/ferromagnet bilayers

Rabinovich, D. S.; Bobkova, I. V.; Bobkov, A. M.; Силаев, М. А.

doi:10.1103/physrevb.99.214501

Cited by 8 publications

(9 citation statements)

References 110 publications

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“…We consider S as an ordinary superconductor in equilibrium with the superconducting gap ∆, complex N/F weak link as a normal metal with nonequilibrium distribution and Zeeman splitting h and the depairing parameter Γ. The latter parameter accounts for the leakage of the superconducting correlations into the ferromagnet and depairing there [39]. d is the length of the N/F area (the distance between superconducting banks), G SF is the specific conductance of the S-N/F boundaries, R N F is the normal state resistance of the N/F area, σ N F is the conductivity and D N F is the diffusion coefficient.…”

Section: B Critical Current Of the Junction Under Qusiparticle Injectionmentioning

confidence: 99%

Controllable supercurrent in mesoscopic superconductor-normal metal-ferromagnet crosslike Josephson structures

Golikova,

Wolf,

Beckmann

et al. 2020

Preprint

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A nonmonotonic dependence of the critical Josephson supercurrent on the injection current through a normal metal/ferromagnet weak link from a single domain ferromagnetic strip has been observed experimentally in nanofabricated planar crosslike S-N/F-S Josephson structures. This behavior is explained by 0-π and π-0 transitions, which can be caused by the suppression and Zeeman splitting of the induced superconductivity due to interaction between N and F layers, and the injection of spin-polarized current into the weak link. A model considering both effects has been developed. It shows the qualitative agreement between the experimental results and the theoretical model in terms of spectral supercurrent-carrying density of states of S-N/F-S structure and the spin-dependent double-step nonequilibrium quasiparticle distribution.

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Section: B Critical Current Of the Junction Under Qusiparticle Injectionmentioning

confidence: 99%

Controllable supercurrent in mesoscopic superconductor-normal metal-ferromagnet crosslike Josephson structures

Golikova,

Wolf,

Beckmann

et al. 2020

Preprint

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“…There are, however, situations in which the domain size may be of the order of the superconducting coherence length. The effect of domain walls in magnetic and insulating ferromagnets on adjacent superconductors has been studied theoretically [28][29][30][31][32] and experimentally [4,33], while Ref. [34] studied the influence of domain-wall dynamics on superconductivity.…”

Section: Introductionmentioning

confidence: 99%

Quasiparticle density of states and triplet correlations in superconductor/ferromagnetic-insulator structures across a sharp domain wall

2022

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A ferromagnetic insulator (FI) in contact with a superconductor (S) is known to induce a spin splitting of the BCS density of states at the FI/S interface. This spin splitting causes the Cooper pairs to reduce their singlet-state correlations and acquire odd-in-frequency triplet correlations. We consider a diffusive FI/S bilayer with a sharp magnetic domain wall in the FI, and we study the local quasiparticle density of states and triplet superconducting correlations. In the case of collinear alignment of the domains, we obtain analytical results by solving the Usadel equation. For a small enough exchange field or weak superconductivity, we also find an analytical expressions for arbitrary magnetic textures, which reveals how the triplet component vector depends on the local magnetization of the FI. For an arbitrary angle between the magnetizations and the strength of the exchange field, we numerically solve the problem of a sharp domain wall. We finally propose two different setups based on FI/S/F stacks, where F is a ferromagnetic layer, to filter out singlet pairs and detect the presence of triplet correlations via tunneling differential conductance measurements.

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“…These effects also occur in the superconducting state [11,14,[27][28][29][30][31]. For temperatures close to the superconducting critical temperature, the magnetoelectric effect can be studied at the level of the Ginzburg-Landau free energy.…”

Section: Introductionmentioning

confidence: 99%

Interplay between superconductivity and spin-dependent fields in nanowire-based systems

et al. 2020

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The interplay between superconductivity, spin-orbit coupling, and Zeeman or exchange field, is studied theoretically in two different setups: a single wire in which all these fields coexist, and a double wire system in which superconducting pairing and the spin-dependent fields are spatially separated. We first explore a magnetoelectric effect, namely the appearance of anomalous charge supercurrents. We determine the conditions under which such currents are allowed by symmetry and express them in terms of the SU(2) electric and magnetic fields. In leading order in the strength of the fields we find that in the single wire setup such currents may appear only when the Zeeman field has both, a longitudinal and transverse component with respect to the spin-orbit field. In contrast, in the two wire setup a parallel component to the SOC can generate the anomalous current, which is allowed by symmetry. We confirm these findings by calculating explicitly the current in both setups together with the self-consistent superconducting order parameter. The latter shows in the ground-state a spatial modulation of the phase that leads to currents that compensate the anomalous current, such that in both cases the ground state corresponds to a total zero-current state. However, in the two wire setup this zero-current state consists of two finite currents flowing in each of the wires in opposite direction.

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Magnetoelectric effects in superconductor/ferromagnet bilayers

Cited by 8 publications

References 110 publications

Controllable supercurrent in mesoscopic superconductor-normal metal-ferromagnet crosslike Josephson structures

Controllable supercurrent in mesoscopic superconductor-normal metal-ferromagnet crosslike Josephson structures

Quasiparticle density of states and triplet correlations in superconductor/ferromagnetic-insulator structures across a sharp domain wall

Interplay between superconductivity and spin-dependent fields in nanowire-based systems

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