Supra-oscillatory critical temperature dependence of Nb-Ho bilayers

Chiodi, F.; Witt, J. D. S.; Smits, R. G. J.; Qu, Lili; Halász, Gábor B.; Wu, C. T.; Valls, Oriol T.; Halterman, Klaus; Robinson, Jason W. A.; Blamire, M. G.

doi:10.1209/0295-5075/101/37002

Cited by 32 publications

(29 citation statements)

References 33 publications

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“…The magnetic texture is spatially varying, and no external magnetic fields need be applied for thermoelectric phenomena to arise. One of the best known conical ferromagnets is the material holmium (Ho) 64 65 below 19 K 66 . The conical ferromagnet is described by the complete Usadel equation in Eq.…”

Section: Resultsmentioning

confidence: 99%

Spin Seebeck effect and thermoelectric phenomena in superconducting hybrids with magnetic textures or spin-orbit coupling

Bathen

Linder

2017

Sci Rep

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We theoretically consider the spin Seebeck effect, the charge Seebeck coefficient, and the thermoelectric figure of merit in superconducting hybrid structures including either magnetic textures or intrinsic spin-orbit coupling. We demonstrate that large magnitudes for all these quantities are obtainable in Josephson-based systems with either zero or a small externally applied magnetic field. This provides an alternative to the thermoelectric effects generated in high-field (~1 T) superconducting hybrid systems, which were recently experimentally demonstrated. The systems studied contain either conical ferromagnets, spin-active interfaces, or spin-orbit coupling. We present a framework for calculating the linear thermoelectric response for both spin and charge of a system upon applying temperature and voltage gradients based on quasiclassical theory which allows for arbitrary spin-dependent textures and fields to be conveniently incorporated.

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Section: Resultsmentioning

confidence: 99%

Spin Seebeck effect and thermoelectric phenomena in superconducting hybrids with magnetic textures or spin-orbit coupling

Bathen

Linder

2017

Sci Rep

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“…The same situation occurs in Refs. [32,35]. As in those works, we search within plausible regions of parameter space, and display here results of the best fit that we have found, which is not necessarily the best possible fit.…”

Section: Discussionmentioning

confidence: 97%

Angular dependence of superconductivity in superconductor/spin-valve heterostructures

et al. 2014

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We report measurements of the superconducting transition temperature, T c , in CoO/Co/Cu/Co/Nb multilayers as a function of the angle α between the magnetic moments of the Co layers. Our measurements reveal that T c (α) is a nonmonotonic function, with a minimum near α = π/2. Numerical self-consistent solutions of the Bogoliubov-de Gennes equations quantitatively and accurately describe the behavior of T c as a function of α and layer thicknesses in these superconductor / spin-valve heterostructures. We show that experimental data and theoretical evidence agree in relating T c (α) to enhanced penetration of the triplet component of the condensate into the Co/Cu/Co spin valve in the maximally noncollinear magnetic configuration.

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“…However, when there are two or more F layers with non-collinear exchange fields, as can happen for example in F 1 /F 2 /S structures, S z cannot commute with the Hamiltonian and the m z = ±1 triplet states can also be induced. This is also the case with a single F layer having a non-uniform magnetization texture [18][19][20] . In contrast to the short-range proximityinduced singlet pair amplitudes, these odd m z = ±1 triplet states are usually long ranged [21][22][23][24][25][26][27] in the F layers.…”

Section: Introductionmentioning

confidence: 87%

Transport in ferromagnet/superconductor spin valves

Moen

Valls

2017

Phys. Rev. B

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We consider charge transport properties in realistic, fabricable, Ferromagnet/Superconductor spin valves having a layered structure F 1 /N/F 2 /S , where F 1 and F 2 denote the ferromagnets, S the superconductor, and N the normal metal spacer usually inserted in actual devices. Our calculation is fully self-consistent, as required to ensure that conservation laws are satisfied. We include the effects of scattering at all the interfaces. We obtain results for the device conductance G, as a function of bias voltage, for all values of the angle φ between the magnetizations of the F 1 and F 2 layers and a range of realistic values for the material and geometrical parameters in the sample. We discuss, in the context of our results for G, the relative influence of all parameters on the spin valve properties. We study also the spin current and the corresponding spin transfer torque in F 1 /F 2 /S structures.

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Supra-oscillatory critical temperature dependence of Nb-Ho bilayers

Cited by 32 publications

References 33 publications

Spin Seebeck effect and thermoelectric phenomena in superconducting hybrids with magnetic textures or spin-orbit coupling

Spin Seebeck effect and thermoelectric phenomena in superconducting hybrids with magnetic textures or spin-orbit coupling

Angular dependence of superconductivity in superconductor/spin-valve heterostructures

Transport in ferromagnet/superconductor spin valves

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