Properties of tunnel Josephson junctions with a ferromagnetic interlayer

Vasenko, A. S.; Golubov, Alexandre Avraamovitch; Kupriyanov, M. Yu.; Weides, Martin

doi:10.1103/physrevb.77.134507

Cited by 56 publications

(102 citation statements)

References 41 publications

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“…Expression (19) reproduces the well-known result previously obtained for single-domain SIFS structures [16]- [18] thereby demonstrating the independence of the critical current on the orientation of the domains magnetization vectors, if they are collinear oriented and the FF interface is fully opaque for electrons.…”

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Josephson effect in SIFS tunnel junctions with domain walls in the weak link region

et al. 2015

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We study theoretically the properties of SIFS type Josephson junctions composed of two superconducting (S) electrodes separated by an insulating layer (I) and a ferromagnetic (F) film consisting of periodic magnetic domains structure with antiparallel magnetization directions in neighboring domains. The two-dimensional problem in the weak link area is solved analytically in the framework of the linearized quasiclassical Usadel equations. Based on this solution, the spatial distributions of the critical current density, JC , in the domains and critical current, IC, of SIFS structures are calculated as a function of domain wall parameters, as well as the thickness, dF , and the width, W, of the domains. We demonstrate that IC(dF , W ) dependencies exhibit damped oscillations with the ratio of the decay length, ξ1, and oscillation period, ξ2, being a function of the parameters of the domains, and this ratio may take any value from zero to unity. Thus, we propose a new physical mechanism that may explain the essential difference between ξ1 and ξ2 observed experimentally in various types of SFS Josephson junctions.

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confidence: 66%

“…For arbitrary values of the width of the magnetic domains to calculate the dependence of I C (d F ) is necessary to use the general expression (18). Figure 2 gives the I C (d F ) curves calculated for H = 10πT C , γ BF = 0 and for a set of widths W/ξ F .…”

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Josephson effect in SIFS tunnel junctions with domain walls in the weak link region

et al. 2015

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“…28 The properties of SIFS junctions have been intensively studied both experimentally [9][10][11][12][13][14][15][16][17][18] and theoretically. [28][29][30][31] However, properties of the quasiparticle current have received relatively little attention so far, although they can be very important for the description of SIFS junctions as possible elements of superconducting logic circuits.…”

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Current-voltage characteristics of tunnel Josephson junctions with a ferromagnetic interlayer

et al. 2011

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We present a quantitative study of the current-voltage characteristics (CVC) of diffusive superconductor/ insulator/ferromagnet/superconductor (SIFS) tunnel Josephson junctions. In order to obtain the CVC we calculate the density of states (DOS) in the F/S bilayer for arbitrary length of the ferromagnetic layer, using quasiclassical theory. For a ferromagnetic layer thickness larger than the characteristic penetration depth of the superconducting condensate into the F layer, we find an analytical expression which agrees with the DOS obtained from a self-consistent numerical method. We discuss general properties of the DOS and its dependence on the parameters of the ferromagnetic layer. In particular we focus our analysis on the DOS oscillations at the Fermi energy. Using the numerically obtained DOS we calculate the corresponding CVC and discuss their properties. Finally, we use CVC to calculate the macroscopic quantum tunneling (MQT) escape rate for the current biased SIFS junctions by taking into account the dissipative correction due to the quasiparticle tunneling. We show that the influence of the quasiparticle dissipation on the macroscopic quantum dynamics of SIFS junctions is small, which is an advantage of SIFS junctions for superconducting qubits applications.

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“…2 b) depicts the IVCs for large and small (inset) ranges of bias current. As the electric transport is in the dirty limit [20], j c scales exponentially with the variation of d F . The polycrystalline structure of roomtemperature sputtered layers and the very low etching rate of NiCu led to a good control over ∆d F .…”

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confidence: 99%

Properties of tunnel Josephson junctions with a ferromagnetic interlayer

Cited by 56 publications

References 41 publications

Josephson effect in SIFS tunnel junctions with domain walls in the weak link region

Josephson effect in SIFS tunnel junctions with domain walls in the weak link region

Current-voltage characteristics of tunnel Josephson junctions with a ferromagnetic interlayer

Josephson Junctions With Centered Step and Local Variation of Critical Current Density

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