Critical current in S-FNF-S Josephson structures with the noncollinear magnetization vectors of ferromagnetic films

Karminskaya, T. Yu.; Kupriyanov, M. Yu.; Golubov, A. A.

doi:10.1134/s0021364008100123

Cited by 21 publications

(19 citation statements)

References 13 publications

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“…The signatures of such long-range proximity superconducting spin correlations were found shortly thereafter in experiments [7]. Numerous works since then, both experimentally and theoretically, have been devoted to the study and generation of superconducting correlations with net spin [8][9][10][11][12].It has been shown that it is possible to study long-range supercurrents in ballistic bilayer [13] and diffusive trilayer [8] magnetic Josephson junctions where the supercurrent flows transversely relative to the noncollinear F/F interfaces. The situation is unfavorable however in the low proximity limit [14] where only faint signatures of the triplet supercurrents with spin projection m=±1 on the quantization axis exist, even in uniformly magnetized trilayers [8,14].…”

mentioning

confidence: 99%

Long-range triplet supercurrents induced by singlet supercurrents parallel to magnetic interfaces

Alidoust

Halterman

2014

Applied Physics Letters

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confidence: 99%

Long-range triplet supercurrents induced by singlet supercurrents parallel to magnetic interfaces

Alidoust

Halterman

2014

Applied Physics Letters

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“…Based on the unique properties of S/F hybrids, several kinds of device physics were proposed such as proximity-effect superconducting spin-switching [13,14,15,16,17] and Josephson current switching [18,19,20] actuated by an external magnetic field. Very recently, magnetic-field-controlled superconductivity switching in the S/F proximity systems [21,22,23,24,25] and the Josephson current switching in the S/F/S junctions [26,27] were demonstrated experimentally.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical analysis of the upper critical field in ferromagnet–superconductor–ferromagnet trilayers

Antropov¹,

Kalenkov²,

Kehrle³

et al. 2013

Supercond. Sci. Technol.

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Abstract. The upper critical magnetic field H c2 in thin-film FSF trilayer spinvalve cores is studied experimentally and theoretically in geometries perpendicular and parallel to the heterostructure surface. The series of samples with variable thicknesses d F1 of the bottom and d F2 of the top Cu 41 Ni 59 F-layers are prepared in a single run, utilizing a wedge deposition technique. The critical field H c2 is measured in the temperature range 0.4 − 8 K and for magnetic fields up to 9 Tesla. A transition from oscillatory to reentrant behavior of the superconducting transition temperature versus F-layers thickness, induced by an external magnetic field, has been observed for the first time. In order to properly interpret the experimental data, we develop a quasiclassical theory, enabling one to evaluate the temperature dependence of the critical field and the superconducting transition temperature for an arbitrary set of the system parameters. A fairly good agreement between our experimental data and theoretical predictions is demonstrated for all samples, using a single set of fit parameters. This confirms adequacy of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) physics in determining the unusual superconducting properties of the studied Cu 41 Ni 59 /Nb/Cu 41 Ni 59 spin-valve core trilayers.Experimental and theoretical analysis of the upper critical field in FSF trilayers 2

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“…53. Below we will apply the developed in [50][51][52] approach to the junctions presented in Figs. 1 and 2 mostly being concentrated on the discussion of the obtained results.…”

Section: Modelmentioning

confidence: 99%

“…Recently [50][51][52][53] it has been shown that both problems can be effectively solved in novel types of S-FN-S and S-FNF-S Josephson junctions. In these structures, the weak-link region consists of FN or FNF multilayer, which separates the superconducting banks while a supercurrent flows in the direction parallel to FN interfaces and is injected across the end walls of FN or FNF structure.…”

Section: Introductionmentioning

confidence: 99%

“…In S-FNF-S Josephson devices, there is no limitation on thickness of N film and it can be made thin enough to realize an effective control upon the junction parameters by changing the mutual orientation of magnetization vectors of ferromagnetic films. 52 The choice of junction geometry considered in Refs. 50-53 was based on existing concept 58,59 that in such ramptype configuration both the critical current I C and I C R N product ͑R N is the normal junction resistance͒ are larger than in overlap geometry when S electrodes are located on the top of weak-link multilayer.…”

Section: Introductionmentioning

confidence: 99%

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Josephson effect in superconductor/ferromagnet structures with a complex weak-link region

et al. 2010

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The critical currents I C of SNF-FN-FNS, SN-FN-NS, and SNF-N-FNS Josephson junctions ͑Ssuperconductor, F-ferromagnetic, N-normal metal͒ with complex SNF or SN electrodes ͑N or NF bilayer are situated under a superconductor͒ are calculated in the framework of linearized Usadel equations for arbitrary overlap length d of SN interface. We demonstrate that in these geometries, in the case of large resistances of SN interfaces, the critical current can exceed that in ramp-type junctions. Based on these results, the choice of the most practically applicable geometry is discussed. We predict that in a certain parameter range there is single 0-transition with the increase in the overlap length d. This single transition can be realized also in SFN-N-FNS Josephson junctions, where the coherence length in the weak-link region is a real quantity. Further, we predict that in SNF-N-FNS Josephson junctions 0-transition may take place with increase in distance between superconducting electrodes.

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Critical current in S-FNF-S Josephson structures with the noncollinear magnetization vectors of ferromagnetic films

Cited by 21 publications

References 13 publications

Long-range triplet supercurrents induced by singlet supercurrents parallel to magnetic interfaces

Long-range triplet supercurrents induced by singlet supercurrents parallel to magnetic interfaces

Experimental and theoretical analysis of the upper critical field in ferromagnet–superconductor–ferromagnet trilayers

Josephson effect in superconductor/ferromagnet structures with a complex weak-link region

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