2009
DOI: 10.1103/physrevb.80.094510
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Nonmonotonic behavior of the anisotropy coefficient in superconductor-ferromagnet-superconductor trilayers

Abstract: We have measured critical temperatures and upper critical magnetic fields as a function of the ferromagnetic layer thickness, d F , in two different superconductor͑S͒/ferromagnet͑F͒/superconductor͑S͒ triple layers: Nb/ Cu 0.41 Ni 0.59 / Nb and Nb/ Pd 0.81 Ni 0.19 / Nb. We vary d F from the 0-phase coupling to the -phase coupling regime and find strong nonmonotonic behavior of the anisotropy coefficient ␥ GL = H c2ʈ ͑0͒ / H c2Ќ ͑0͒ characterized by an initial increase, a peak, and a subsequent decrease. The pea… Show more

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Cited by 18 publications
(26 citation statements)
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“…The thickness of the samples has been carefully calibrated against the deposition rate. As expected, the critical temperature T c dropped with increasing d F [11], and we obtained T c = 7.5, 6.2, 5.1, 4.1 K in the samples with d F = 0 (pure Nb), 1, 2, 8 nm, respectively.…”
Section: Introductionsupporting
confidence: 86%
“…The thickness of the samples has been carefully calibrated against the deposition rate. As expected, the critical temperature T c dropped with increasing d F [11], and we obtained T c = 7.5, 6.2, 5.1, 4.1 K in the samples with d F = 0 (pure Nb), 1, 2, 8 nm, respectively.…”
Section: Introductionsupporting
confidence: 86%
“…The critical temperature rapidly decreases with increasing the thickness of the ferromagnetic layer, showing a minimum around d PdNi ≈ 5 nm. The value of the dip position scales reasonably well with the ones obtained for Nb/PdNi systems for different Ni concentrations of the alloy [19,20,24].…”
Section: Preliminary Characterizationsupporting
confidence: 80%
“…The S/F bilayers consist of a 40-nm thick Nb layer, and of a weakly ferromagnetic alloy, Pd 0.84 Ni 0.16 (=PdNi) layer, with variable thickness, d PdNi = 2-4-5-9 nm. This system was chosen since the existence of an inhomogeneous superconducting order parameter in F, peculiar characteristic of S/F hybrids [1,2,6,15,16], has been already demonstrated for Nb/Pd 1-x Ni x systems [19][20][21][22][24][25][26]. Moreover, PdNi is characterized by longer spin-flip scattering length compared to the widely used CuNi alloy [27].…”
Section: Fabricationmentioning
confidence: 99%
“…In the case of a coupling, a 2D-3D crossover occurs [34,38]. There are also studies of H c2 in ferromagnetic alloy -superconductor heterostructures [40,41,42], where 2D-3D crossover, the flux pinning mechanism and the anisotropy coefficient, γ GL =H c2 (0)/H difference in the phase of the superconductig order parameter between S-layers can vary what significantly affects on T c and complicates the experimental detection of oscillatory T c (d F ) behavior [39]. Therefore, to explore experimentally the evolution of the T c (d F ) dependence from oscillatory type to reentrant one under applied magnetic field we have chosen the system with sole superconducting layer.…”
Section: Introductionmentioning
confidence: 99%