Magnetic field tunable superconducting transition in Nb/Co/Py/Nb exchange spring multilayers

Bhatia, Ekta; Devine-Stoneman, James; Barber, Z. H.; Robinson, Jason W. A.; Senapati, Kartik

doi:10.1063/1.5139266

Cited by 2 publications

(4 citation statements)

References 29 publications

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“…In the following sections we review two relevant aspects of spin-triplet correlations in S/F hybrid structures, based on our previous experiments [25,26]. In the first part we discuss the use of natural ferromagnetic domain walls to achieve spin-singlet to spin-triplet Cooper pair conversion in a planar nano-SQUID structure [25].…”

Section: Experiments On Spin Triplet Correlations In Hybrid S/f Struc...mentioning

confidence: 99%

“…In the first part we discuss the use of natural ferromagnetic domain walls to achieve spin-singlet to spin-triplet Cooper pair conversion in a planar nano-SQUID structure [25]. In the second part we discuss the use of diamagnetic screening currents to probe spintriplet correlations in superconductor/exchange spring multilayer structures [26].…”

Section: Experiments On Spin Triplet Correlations In Hybrid S/f Struc...mentioning

confidence: 99%

“…The diamagnetic screening current, upon sensing a magnetically non-collinear structure at S/F interface may generate a triplet component that can extend further into the F layer. As a consequence, the transition temperature T c of the S/F1/F2/S system, defined as the onset of diamagnetic response, can get affected [26]. In this context, magnetic exchange-spring (XS) interfaces are good candidates to control the singlet-to-triplet conversion process with small magnetic fields.…”

Section: Probing Spin-triplet Correlations Via Diamagnetic Screening ...mentioning

confidence: 99%

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Aspects of long range spin–triplet correlations in superconductor/ferromagnet hetero-structures

Bhatia¹,

Senapati²

2022

Supercond. Sci. Technol.

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The notion of competing ferromagnetic(F) and superconducting(S) orders in F/S hybrid structures was transformed by the first realization of ferromagnetic Josephson π-junctions and the almost simultaneous prediction of a possibility of spin- triplet correlations in such structures, almost two decades back. F/S hybrid structures in various configurations are now studied as rich sources of emergent states and new effects. Unlike the spin singlet Cooper pairs, the spin triplet Cooper pairs are much less affected by the exchange field of a ferromagnet and, therefore, immediately finds interest in the field of spintronics. Theoretically it has been shown that the basic protocol for spin-singlet to spin-triplet supercurrent conversion is the presence of magnetic non-collinearity at the superconductor-ferromagnet interface. Therefore, almost all experiments in this direction have utilized transport measurements on F/S systems with artificial magnetic non-collinearity formed by combination of several ferromagnetic layers next to the superconducting layer. Here we highlight two aspects of studying these heterostructures. Firstly we show that natural magnetic inhomogeneities, found in domain walls of ferromagnets, can also be used to achieve singlet-triplet conversion, instead of artificial magnetic inhomoheneities. This possibility was explored via transport measurements in nano-scale planar Nb-Ni- Nb junctions and nano-SQUIDs, where a domain wall was pinned at the Josephson junction barrier. By this method we were able to show Josephson coupling across about 70 nm of strong ferromagnetic planar barrier. Secondly we show that spin-triplet correlations at the F/S interface are robust enough to be probed by the diamagnetic screening currents at the interface. This was probed by studying the change in sperconducting transition temperature of Nb/Co/Py/Nb multilayers in presence of small in-plane magnetic field. The Co/Py combination, which is a soft-hard type magnetic exchange spring, worked as magnetic inhomogeneity for triplet generation at the interface of the superconducting Nb.

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Section: Experiments On Spin Triplet Correlations In Hybrid S/f Struc...mentioning

confidence: 99%

Section: Experiments On Spin Triplet Correlations In Hybrid S/f Struc...mentioning

confidence: 99%

Section: Probing Spin-triplet Correlations Via Diamagnetic Screening ...mentioning

confidence: 99%

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Aspects of long range spin–triplet correlations in superconductor/ferromagnet hetero-structures

Bhatia¹,

Senapati²

2022

Supercond. Sci. Technol.

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“…On the other hand, in superconducting spintronics, it is essential to generate spin-triplet Cooper pairs on demand [29]. It was reported that in a graphene ferromagnet (F)/SC/F nanostructure [30], the induced equal spin triplet correlations in the SC can be controlled by tuning either the magnetization directions or by manipulating the Fermi level of the F layer.…”

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confidence: 99%

Perfect modulation between fully spin-polarized spin-singlet and -triplet Andreev entanglements in a narrow quantum spin Hall system

Liu¹,

Chen²,

Tao³

et al. 2020

EPL

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We consider a quantum spin Hall (QSH) insulator strip touching on one s-wave superconductor sandwiched between two ferromagnetic insulators and study its scattering processes, tunneling conductance, and noise power by using an extended Bogoliubov-de Gennes scattering formalism. It is demonstrated that interedge coupling and noncollinear magnetizations allow for producing the usual and novel crossed Andreev reflections (ARs), respectively, and thus the corresponding spin-singlet and -triplet pairing entanglements. Moreover, by proper tuning of the band structures of the ferromagnetic layers, under the resonance bias voltage, not only perfect but also fully spin-polarized crossed AR at any magnetic orientational angle α is exhibited, which can be experimentally confirmed by the tunneling conductance and noise power. Particularly, the perfect and fully spin-polarized modulation between the spin-singlet and -triplet Andreev entanglements could be performed by α at certain energy values, which suggest that the setup can act as a topological superconducting spintronic device with such a manipulation function.

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Magnetic field tunable superconducting transition in Nb/Co/Py/Nb exchange spring multilayers

Cited by 2 publications

References 29 publications

Aspects of long range spin–triplet correlations in superconductor/ferromagnet hetero-structures

Aspects of long range spin–triplet correlations in superconductor/ferromagnet hetero-structures

Perfect modulation between fully spin-polarized spin-singlet and -triplet Andreev entanglements in a narrow quantum spin Hall system

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