Magnetism of Fe/Cr/Gd superlattices

Ryabukhina, M. V.; Кравцов, Е. А.; Blagodatkov, D. V.; Наумова, Л. И.; Nikitenko, Yu. V.; Proglyado, V. V.; Khaydukov, Yu. N.

doi:10.1134/s1027451015010164

Cited by 4 publications

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“…A similarly suppressed moment was found in Gd/U [49], Gd/V [50] and Gd/Cr [51] multilayers. This suppression may well be related to the presence of the less magnetic fcc phase together with the bulk hcp phase which was recently found in Fe/Cr/Gd multilayers [40].…”

Section: Discussionsupporting

confidence: 52%

“…In contrast itinerant ferromagnets (Fe, Co, Ni) form magnetically dead layers at the S/F interface [35][36][37], thus deteriorating the interface transparency. Another advantage of Gd is its ability to couple with other ferromagnets [38][39][40][41][42] forming non-trivial magnetic ordering patterns which can be used for the creation of superconducting spin-valves [29][30][31]. Finally, niobium and gadolinium components are not mutually soluble, neither in the solid nor in the liquid phase [43,44].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic and superconducting phase diagram of Nb/Gd/Nb trilayers

et al. 2018

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We report on a study of the structural, magnetic and superconducting properties of Nb(25nm)/Gd(d f )/Nb(25nm) hybrid structures of a superconductor/ ferromagnet (S/F) type. The structural characterization of the samples, including careful determination of the layer thickness, was performed using neutron and X-ray scattering with the aid of depth sensitive mass-spectrometry. The magnetization of the samples was determined by SQUID magnetometry and polarized neutron reflectometry and the presence of magnetic ordering for all samples down to the thinnest Gd(0.8nm) layer was shown. The analysis of the neutron spin asymmetry allowed us to prove the absence of magnetically dead layers in junctions with Gd interlayer thickness larger than one monolayer. The measured dependence of the superconducting transition temperature Tc(d f ) has a damped oscillatory behavior with well defined positions of the minimum at d f =3nm and the following maximum at d f =4nm; the behavior, which is in qualitative agreement with the prior work (J.S. Jiang et al, PRB 54, 6119). The analysis of the Tc(d f ) dependence based on Usadel equations showed that the observed minimum at d f =3nm can be described by the so called "0" to "π" phase transition of highly transparent S/F interfaces with the superconducting correlation length ξ f ≈ 4nm in Gd. This penetration length is several times higher than for strong ferromagnets like Fe, Co or Ni, simplifying thus preparation of S/F structures with d f ∼ ξ f which are of topical interest in superconducting spintronics.

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