Thermal fluctuations in superconductor/ferromagnet nanostripes

Nasti, Umberto; Parlato, L.; Ejrnæs, M.; Cristiano, R.; Taino, Tohru; Myoren, H.; Sobolewski, Roman; Pepe, Giovanni Piero

doi:10.1103/physrevb.92.014501

Cited by 23 publications

(15 citation statements)

References 21 publications

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“…The expected count rate is given by 18 :where Ω VAP is the attempt frequency, A(T) is the vortex interaction parameter, ε is the averaged polarizability of a VAP within the entire VAP population and I B is the normalized bias current. The resulting fitting parameter A(T)/ε is 47 meV, which is about one order of magnitude lower than what was observed in similar nanostrips based on NbN 36 .…”

Section: Methodscontrasting

confidence: 55%

Superconductor to resistive state switching by multiple fluctuation events in NbTiN nanostrips

Ejrnæs

Salvoni

Parlato

et al. 2019

Sci Rep

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We report on measurements of the switching current distributions on two-dimensional superconducting NbTiN strips that are 5 nm thick and 80 nm wide. We observe that the width of the switching current distributions has a non-monotonous temperature dependence, where it is constant at the lowest temperatures up to about 1.5 K, after which it increases with temperature until 2.2 K. Above 2.5 K any increase in temperature decreases the distribution width which at 4.0 K is smaller than half the width observed at 0.3 K. By using a careful analysis of the higher order moments of the switching distribution, we show that this temperature dependence is caused by switching due to multiple fluctuations. We also find that the onset of switching by multiple events causes the current dependence of the switching rate to develop a characteristic deviation from a pure exponential increase, that becomes more pronounced at higher temperatures, due to the inclusion of higher order terms.

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Section: Methodscontrasting

confidence: 55%

Superconductor to resistive state switching by multiple fluctuation events in NbTiN nanostrips

Ejrnæs

Salvoni

Parlato

et al. 2019

Sci Rep

Self Cite

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“…This role of vortices for the generation of dark counts has been further strengthened in a very recent publication [68] that became available after the first submission of this paper, in which a significant reduction of the dark-count rate in ferromagnet-superconductor bilayers is reported.…”

Section: Photon Countsmentioning

confidence: 99%

Detection mechanism of superconducting nanowire single-photon detectors

Engel¹,

Renema²,

Ilin³

et al. 2015

Supercond. Sci. Technol.

143

111

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Abstract. In this paper we intend to give a comprehensive description of the current understanding of the detection mechanism in superconducting nanowire singlephoton detectors. We will review key experimental results related to the detection mechanism, e.g. the variations of the detection probability as a function of bias current, temperature or magnetic field. Commonly used detection models will be introduced and we will analyze their predictions in view of the experimental observations. Although none of the proposed detection models is able to describe all experimental data, it is becoming increasingly clear that vortices are essential for the formation of the initial normal-conducting domain that triggers a detection event.

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“…Also promising applications might be found by using superconducting materials in combination with ferromagnetic insulators that may act as spin-filters [36][37][38]. In particular several thermal effects related to these material combination have been studied in recent works [39][40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Theory of the spin-galvanic effect and the anomalous phase shiftφ0in superconductors and Josephson junctions with intrinsic spin-orbit coupling

2015

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Due to the spin-orbit coupling (SOC) an electric current flowing in a normal metal or semiconductor can induce a bulk magnetic moment. This effect is known as the Edelstein (EE) or magneto-electric effect. Similarly, in a bulk superconductor a phase gradient may create a finite spin density. The inverse effect, also known as the spin-galvanic effect, corresponds to the creation of a supercurrent by an equilibrium spin polarization. Here, by exploiting the analogy between a linear-in-momentum SOC and a background SU(2) gauge field, we develop a quasiclassical transport theory to deal with magneto-electric effects in superconducting structures. For bulk superconductors this approach allows us to easily reproduce and generalize a number of previously known results. For Josephson junctions we establish a direct connection between the inverse EE and the appearance of an anomalous phase-shift ϕ0 in the current-phase relation. In particular we show that ϕ0 is proportional to the equilibrium spin-current in the weak link. We also argue that our results are valid generically, beyond the particular case of linear-in-momentum SOC. The magneto-electric effects discussed in this study may find applications in the emerging field of coherent spintronics with superconductors.

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Thermal fluctuations in superconductor/ferromagnet nanostripes

Cited by 23 publications

References 21 publications

Superconductor to resistive state switching by multiple fluctuation events in NbTiN nanostrips

Superconductor to resistive state switching by multiple fluctuation events in NbTiN nanostrips

Detection mechanism of superconducting nanowire single-photon detectors

Theory of the spin-galvanic effect and the anomalous phase shiftφ0in superconductors and Josephson junctions with intrinsic spin-orbit coupling

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