Intrinsic Josephson effect and prospects of superconducting spintronics
In the last decade, a very rapid development in superconducting spintronics based on functional nanostructures and Josephson junctions has been observed as well as their implementation in quantum computer building blocks and in the design of novel brain-like artificial neural networks and computers with non-von Neumann architecture
The main goal of this thematic issue is to highlight the new research area of superconductor/ferromagnetic hybrid nanostructures, including various elements with intrinsic Josephson effect and their applications in quantum electronics and spintronics. In addition, the thematic issue will also highlight some other interesting functional nanostructures in the fascinating world of nanoelectronics.
Research contributions to this thematic issue may include but are not limited to the following topics:
- Physics and applications of the intrinsic Josephson effect
- Superconductor/ferromagnetic hybrid structures and prospects of superconducting spintronics
- High-frequency Josephson devices
- Modelling of functional nanostructures
- Unconventional and topological superconductivity
- Artificial neural networks, qubits, and quantum computing
Download all of the current publications in this thematic issue by clicking on "Download Issue".
- Full Research Paper
- Published 23 Nov 2021
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Figure 1: The dependence of the critical current (black dots) and the characteristic length of the Josephson ...
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Figure 2: IVCs of a Josephson junction without an MW signal (blue dots), under the action of an external sign...
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Figure 3: The dependence of the first Shapiro step amplitude on the temperature for 72 and 265 GHz radiation ...
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Figure 4: max ΔI1 as function of Fmw at various temperatures. The dotted lines mark the position of the two f...
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Figure 5: The first Shapiro step as function of Pmw at three temperatures and under a signal at 72 GHz (upper...
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- Full Research Paper
- Published 21 Dec 2021
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Figure 1: Optical images of (a) a whisker and (b) a crystal-based device with similar electrode geometries. (...
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Figure 2: Current–voltage characteristics of mesa structures on (a) whisker- and (b) crystal-based devices. (...
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Figure 3: Heat transport in a whisker-based device without electrodes. (a) A sketch of the device and (b) a c...
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Figure 4: Heat transport in a whisker-based device with an electrode. (a) A sketch of the device and (b) a cr...
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Figure 5: Heat transport in a crystal-based device in vacuum (a) without electrodes, (b) with electrodes. The...
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Figure 6: Simulated radiative properties at f = 1 THz for (a) crystal based device, (b) crystal-based device ...
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Figure 7: Variation of radiative properties with increasing dielectric losses tan(δ) = 0 (top row), 1 (middle...
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- Full Research Paper
- Published 04 Mar 2022
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Figure 1: The system of two capacitively coupled superconducting nanowires.
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Figure 2: Time-dependent phase configurations describing a QPS event at t = 0 (red) and t > 0 (blue) together...
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Figure 3: The same as in Figure 1 in the first of the two capacitively coupled superconducting nanowires. Each of the...
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Figure 4: Time-dependent phase configurations at t = 0 (red) and t > 0 (blue) together with propagating volta...
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- Full Research Paper
- Published 28 Mar 2022
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Figure 1: (a–c) Three log-periodic antennas of various geometries; (d) system with a lens (d) and (e) beam pa...
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Figure 2: Normalized level of absorbed power in the port for the three antenna geometries in Figure 1.
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Figure 3: Geometry of log-periodic antennas with a meander series of Josephson YBaCuO grain boundary junction...
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Figure 4: Integral absorbed power for two different cases. Black curve: a single port in an antenna; blue cur...
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Figure 5: Left: circuit schematic of JJs in a series array interacting via a common RLC load. Right: current–...
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Figure 6: (a) Response ΔV versus dc current I for different MW signals, from bottom to top: PMW = 5, 20, 40, ...
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Figure 7: (a) IVCs for different numbers of JJs from one to eleven under a MW signal with power PMW = 3 μW an...
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- Full Research Paper
- Published 30 Mar 2022
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Figure 1: Dependence of the resistivity on the magnetic field at its different orientations, T = 5 K. The fie...
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Figure 2: (a) Dependence of the resistivity Δρz on the magnetic field strength at different temperatures. Ins...
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Figure 3: Dependences of the resistivity on the applied magnetic field for (a) φΗ = 6°, θΗ = 90° and (c) φΗ =...
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Figure 4: (a) Dependences of the resistivity ρxy on the applied magnetic field for different angles φH (measu...
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Figure 5: (a) Dependences of the coercive fields of the two jumps (Hc1 and Hc2) on the direction of the appli...
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Figure 6: Magnetic hysteresis loops for the Pd0.92Fe0.08/Ag/Pd0.96Fe0.04 heterostructure at T = 5 K at an ang...
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Figure 7: (a) Dependences of the coercive fields of the Pd0.92Fe0.08/Ag/Pd0.96Fe0.04 heterostructure on the a...
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- Full Research Paper
- Published 18 May 2022
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Figure 1: (a) Schematic illustration of a RBF network. (b) Schematic representation of a Gauss-neuron ensurin...
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Figure 2: Transfer functions (normalized) and their main characteristics for the Gauss-neuron. (a, b) Familie...
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Figure 3: (a) Amplitude of the transfer function and (b) its standard deviation from the Gaussian-like functi...
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Figure 4: (a) Dynamic transfer function of a Gauss-neuron for a trapezoidal external signal for different val...
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Figure 5: Sketch of the tunable kinetic inductance based on multilayer structure in the (a) closed and (b) op...
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Figure 6: Spatial distribution of the pair amplitude F in the hybrid structures (a) S–FM1–s–FM2–s–FM1–s–FM2–N...
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Figure 7: Kinetic inductance of the hybrid structures S–FM1–s–FM2–s–FM1–s–FM2–s–N and S–FM1–n–FM2–n–FM1–n–FM2...
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- Full Research Paper
- Published 04 Jul 2022
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Figure 1: (a) Scheme of the measurement electronics with thermal anchoring and various filtering stages. (b) ...
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Figure 2: (a) The current–voltage characteristics of the Josephson junction with Ic = 8.6 μA at 50 mK. The re...
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Figure 3: Width of the switching current distribution of the Josephson junction. One can see a standard behav...
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Figure 4: The lifetime of the junction as a function of the bias current at temperatures of 50 mK (green), 30...
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Figure 5: The switching probability of the JJ as a function of the power of the signal (with duration 50 ms) ...
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- Full Research Paper
- Published 14 Jul 2022
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Figure 1: (a) Sketch of a flexible hybrid system consisting of a classical ANN having its configuration (syna...
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Figure 2: The energy spectrum and adiabatic (instantaneous) wave functions are represented at the initial tim...
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Figure 3: The neuron activation functions for l = 0.1 and different initial states: The black curve correspon...
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Figure 4: The Wigner functions W(φ, p, t = 0) of the considered system initialized at the initial moment of t...
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Figure 5: The evolution of the Wigner function under the influence of the input flux φin for the SQ neuron in...
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Figure 6: The activation functions of the neuron with l = 2.5 initialized (a) in the ground state, see the bl...
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Figure 7: Evolution of the Wigner function of the SQ neuron with l = 2.5 initialized in the ground state unde...
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Figure 8: The activation function of the neuron with l = 2.5 initialised at t = 0 in the ground state. Here t...
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Figure 9: The value of the square of the standard deviation, SD, of the SQ neuron activation function from th...
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Figure 10: The neuron activation function for l = 0.1 (a, c) and l = 2.5 (b, d) when the cell is initialized i...
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Figure 11: The neuron activation functions for l = 0.1 (a, c) and l = 2.5 (b, d) for different renormalized co...
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- Full Research Paper
- Published 20 Jul 2022
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Figure 1: (a) The experimental setup of the FI–S bilayer. The differential conductance is measured with help ...
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Figure 2: Phase diagram of the spin mixing angle δφ/π as a function of the normalized temperature T/Tc for va...
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Figure 3: Density of states in a superconductor in proximity to a ferromagnetic insulator indicated by the sp...
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Figure 4: False-color scanning electron microscopy image of the sample and experimental scheme.
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Figure 5: (a) Differential conductance g as a function of the bias V for different applied magnetic fields B ...
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- Full Research Paper
- Published 25 Aug 2022
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Figure 1: Temperature evolutions of the reflectivity transients of Pd1−xFex alloy thin epitaxial films for co...
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Figure 2: Temperature evolution of the time-resolved magneto-optical Kerr angle transients for the Pd0.962Fe0...
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Figure 3: Temperature dependences of the amplitudes (a) and the lifetimes (b) of the slow relaxation componen...
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Figure 4: Temperature dependences of the amplitudes of the fast (squares/solid lines) (a) and the slow (circl...
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Figure 5: Temperature dependences of the reflectivity slow relaxation amplitudes of the Pd0.962Fe0.038 (blue)...
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- Full Research Paper
- Published 01 Sep 2022
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Figure 1: The front part and the constriction of the back-to-back horn of the LSPE-SWIPE receiving system [3] us...
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Figure 2: The mode composition of the electromagnetic field in the constriction of a bidirectional horn as a ...
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Figure 3: Receiving system of the LSPE-SWIPE145 GHz main channel. a) A quarter of receiving cells matrix on t...
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Figure 4: Frequency response of the LSPE-SWIPE 145 GHz main frequency channel.
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Figure 5: a) Receiving cell array based on bow-tie antennas; half of the 7 mm plate on the left are 210 GHz a...
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Figure 6: Frequency response of a matrix of receiving cells based on bow-tie antennas for 210 GHz and 240 GHz...
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Figure 7: NEP estimations for the 145 GHz channel with 11 pW power load. Dashed curves are for 44 SINS CEBs; ...
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Figure 8: NEP estimations for the 210 GHz channel with 12.4 pW power load. Dashed curves are for 44 SINS CEBs...
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Figure 9: NEP estimations for the 240 GHz channel with 16 pW power load. Dashed curves are for 44 SINS CEBs; ...
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- Full Research Paper
- Published 07 Sep 2022
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Figure 1: (a) Experimental current–voltage characteristics (solid curves) in comparison with theory (dots) at...
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Figure 2: (a) The electron temperature of the absorber determined from the solution of the heat balance equat...
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Figure 3: (a) The sum of the Andreev and leakage currents found by solving the heat balance equation for samp...
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- Full Research Paper
- Published 21 Oct 2022
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Figure 1: Schematic view of a SFS φ0 Josephson junction. The external current is applied along the x directio...
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Figure 2: Maximal amplitude of magnetization my-component at each value of voltage along the I–V characterist...
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Figure 3: Part of the I–V characteristics of the φ0 junction at G = 0.05, r = 0.05, and different values of G...
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Figure 4: (a) Demonstration of ADD at different values of SOC parameter r at G = 0.05. Numbers indicate: 1 – r...
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Figure 5: I–V characteristics of φ0 and SIS junctions and calculated average superconducting current through ...
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Figure 6: Enlarged parts of the I–V curves, in the resonance region at different values of the SOC parameter r...
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Figure 7: (a) Enlarged parts of the I–V curves at different values of α. (b) Voltage dependence of
![[Graphic 14]](/bjnano/content/inline/2190-4286-13-97-i38.svg?max-width=637&scale=1.18182)
at differ...
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Figure 8: Numerically (red curve) and analytically (blue curve) calculated amplitude dependence of my.
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Figure 9: Numerically calculated superconducting current for SFS junction (plot 1) and analytical I0 (plot 2)...
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Figure 10: The dependence of the resonance maximum of
![[Graphic 18]](/bjnano/content/inline/2190-4286-13-97-i42.svg?max-width=637&scale=1.18182)
(V) on α in the damping parameter interval [0.001–0.12]....
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Figure 11: Numerical calculations according to Equation 6 (squares), analytical calculations according to Equation 23 (solid line),...
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- Full Research Paper
- Published 01 Dec 2022
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Figure 1: Geometry of the SF bilayer. We consider the SF interface to be a tunnel barrier. Here, γB is the in...
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Figure 2: The evolution of the DOS plotted for increasing values of the exchange field h. Here, γB = 5, df = ...
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Figure 3: The evolution of the DOS plotted for increasing values of the SF interface transparency γB. Here, df...
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Figure 4: The DOS Nf(E) at the free boundary of the F layer in the SF bilayer in the presence of magnetic and...
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Figure 5: The DOS Nf(E) at the free boundary of the F layer in the SF bilayer in the presence of magnetic sca...
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Figure 6: The peak at E = Δ in the DOS calculated numerically for three different h (a): h = 1.4Δ (black soli...
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Figure 7: The DOS calculated analytically in the limit of low proximity and thin adjacent normal metal layer h...
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Figure 8: Current–voltage characteristics of a SFIFS junction in the presence of a spin-dependent scattering....
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Figure 9: Comparison of the analytical result in the limit of low proximity and a thin adjacent ferromagnetic...
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- Full Research Paper
- Published 06 Dec 2022
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Figure 1: (a) Geometry of sample-1 with 332 JJs in each of the three linear arrays. (b) Two enlarged fragment...
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Figure 2: IVCs of outer array-a (rigth axis) and adjacent inner array-b (left axis) of sample-1 (a) and sampl...
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Figure 3: (a, b) IVCs of the outer array-a in sample-1 (a) and corresponding bolometer signal (b) when the in...
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Figure 4: The data set for the IVCs of the outer array-a in sample-2 (a) and for the corresponding bolometer ...
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Figure 5: (a) View of the measurement scheme with two JJ arrays on different substrates formed in a stack. Ea...
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Figure 6: (a) The simulated scheme consisting of two identical JJ arrays on a common substrate. Each array ha...
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Figure 7: (a, b) Distribution of work of JJs under the EM field (a) and of the phase shift between ac voltage...
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- Full Research Paper
- Published 19 Dec 2022
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Figure 1: (a) Structural unit of poly(diphenylene phthalide) (PDP) molecule. (b) Schematics of C–O bond break...
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Figure 2: (a) Schematics of a Pb (grey)–PDP (blue)–Pb (grey) three layer heterostructure on insulating substr...
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Figure 3: Current–voltage characteristics, measured at room temperature, of several Pb–PDP–Pb sandwiches with...
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Figure 4: Sandwich structure Pb–PDP–Pb–0.4-GLASS, thickness of polymer is about 350 nm, both Pb electrodes ar...
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- Full Research Paper
- Published 28 Dec 2022
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Figure 1: (a, c) Layouts of the studied meander and linear arrays. The meander array in (a) contains seven me...
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Figure 2: (a) Fraunhofer-type modulation of the critical current as a function of in-plane magnetic field for...
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Figure 3: Ensembles of the I–V characteristics with different numbers of active JJs for the meander array at T...
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Figure 4: (a) An integrated oscillogram for the linear array at T = 2.4 K and for an in-plane field H = 7 Oe....
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Figure 5: (a) Parts of the V–I curves near the main resonance for the meander array with different number of ...
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Figure 6: (a) Optical image of a superconducting detector with a log-periodic microwave antenna. (b) SEM imag...
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Figure 7: (a, b) The I–V characteristics (integrated oscillograms) of the meander array acquired at (a) H = 8...
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Figure 8: (a) Parts of the I–V characteristics of the meander array near the main resonance. (b) The main ste...
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Figure 9: Detected power as a function of the number of active junctions for two modes from Figure 7b at bias currents...
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- Full Research Paper
- Published 04 Jan 2023
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Figure 1: Problem statement for the complex study of cobalt and niobium heterostructures. The sketch of the N...
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Figure 2: Variation of the average value of the crystal lattice ideality parameter in horizontal layers of a ...
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Figure 3: Multilayer nanocomposite of niobium and cobalt (a) formed in a numerical experiment during depositi...
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Figure 4: Spatial distribution of cobalt atom spins for ideal crystal hexagonal close-packed lattice (a), (b)...
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Figure 5: Changes in spin temperature under a constant external magnetic field of 1.0 T for ideal hexagonally...
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Figure 6: Changes in the magnetization vector modulus under a constant external magnetic field with an induct...
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- Full Research Paper
- Published 05 Jan 2023
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Figure 1: Resistive transition in zero magnetic field of the NbRe (black squares) and NbReN (red circles) mic...
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Figure 2: (a) Temperature dependence of the resistance of the NbRe microstrip in various magnetic fields in t...
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Figure 3: (a, b) H–T phase diagram of (a) the NbRe and (b) the NbReN microstrip. Black squares and red circle...
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Figure 4: (a, b) Temperature dependence of the perpendicular upper critical field of (a) the NbRe and (b) the...
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- Full Research Paper
- Published 09 Jan 2023
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Figure 1: Schematics of the processes of crossed Andreev reflection (a) and elastic cotunneling (b). These sc...
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Figure 2: Schematics of the NSN structure under consideration. Normal electrodes are biased by external volta...
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Figure 3: Non-local noise S12 (Equation 26) in the tunneling limit (Equation 25). Left panel: T = 0; middle panel: T = 0.1Δ, δT = 0...
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Figure 4: Non-local noise S12 (Equation 27) in the case of fully transparent junctions. Left panel: T = 0; middle panel: ...
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Figure 5: Non-local noise S12 (Equation 29) in the case of diffusive barriers. Left panel: T = 0; middle panel: T = 0.03...
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- Full Research Paper
- Published 26 Jan 2023
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Figure 1: (a) A sketch of the Josephson flux-flow oscillator. It is based on a sandwich-type junction with tw...
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Figure 2: (a) Simulated current–voltage characteristics of a junction with L = 5λJ, Φ/Φ0 = 5 and α = 0.1. Blu...
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Figure 3: Panels (a) and (b) show mode-number dependence of coefficients Bn and Cn, given by Equation 20 and Equation 21, for the c...
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Figure 4: A proposed design of the impedance-matched free-space Josephson oscillator. Here, a small stack of ...
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- Full Research Paper
- Published 21 Feb 2023
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Figure 1: The investigated hybrid superconducting structure consisting of a ferromagnetic insulator (FI) adja...
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Figure 2: Distributions of the spin current density inside the superconducting layer at different frequencies...
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Figure 3: In-plane component of the induced magnetization at the S/FI interface as a function of the magnetic...
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Figure 4: Evolution of the spin-resolved distribution function at the S/FI interface (Sx component in the upp...
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Figure 5: Snapshots of the spin distribution function at different moments of the precession period at a freq...
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