Investigation of Current Gain in Superconducting-Ferromagnetic Transistors With High-j ${}_{\rm c}$ Acceptor

Nevirkovets, I. P.; Shafraniuk, Serhii; Chernyashevskyy, O.; Yohannes, Daniel; Mukhanov, Oleg A.; Ketterson, J. B.

doi:10.1109/tasc.2016.2637864

Cited by 8 publications

(18 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7 (a, c)]. In SFIFS junctions the overlap of subgap DOS struc- We also notice that in recent experiments on SFIFS junctions as injectors of superconductorferromagnetic transistors (SFT) some fine structures of the subgap quasiparticle current was observed, [82][83][84][85] which looks similar to our theoretical results.…”

Section: Current-voltage Characteristics Of Sfifs Junctionssupporting

confidence: 88%

“…In this paper we study the current-voltage characteristics of SFIFS Josephson junctions with two ferromagnetic interlayers. SFIFS structures were also proposed for various applications in memory elements, [56][57][58] single flux quantum (SFQ) circuits, [47] and as injectors in superconductorferromagnetic transistors (SFT), [81][82][83][84] which can be used as amplifiers for memory, digital, and RF applications. In this work we study the current-voltage characteristics of a SFIFS junction, shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The anomalous nonmonotonic shape of the currentvoltage characteristics of SFIFS junctions with weak ferromagnetic layers looks similar to the fine structures of quasiparticle currents, recently obtained experimentally on similar systems. [82][83][84][85] The paper organized as follows. In the first section (Model) we formulate the theoretical model and basic equations and introduce the self-consistent numerical iterative method for calculating the density of states (DOS) in S/F bilayers.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Anomalous current-voltage characteristics of SFIFS Josephson junctions with weak ferromagnetic interlayers

Karabassov¹,

Guravova²,

Kuzin³

et al. 2019

Preprint

View full text Add to dashboard Cite

We present a quantitative study of the current-voltage characteristics (CVC) of SFIFS Josephson junctions (S denotes bulk superconductor, F - metallic ferromagnet, I - insulating barrier) with weak ferromagnetic interlayers in the diffusive limit. The problem is solved in the framework of the nonlinear Usadel equations. We consider the case of a strong tunnel barrier such that the left SF and the right FS bilayers are decoupled. We calculate the density of states (DOS) in SF bilayers using a self-consistent numerical method. Then we obtain the CVC of corresponding SFIFS junctions, and discuss their properties for different set of parameters including the thicknesses of ferromagnetic layers, the exchange field, and the magnetic scattering time. We observe the anomalous nonmonotonic CVC behavior in case of weak ferromagnetic interlayers, which we ascribe by DOS energy dependencies in case of small exchange fields in F layers.

show abstract

Section: Current-voltage Characteristics Of Sfifs Junctionssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Anomalous current-voltage characteristics of SFIFS Josephson junctions with weak ferromagnetic interlayers

Karabassov¹,

Guravova²,

Kuzin³

et al. 2019

Preprint

View full text Add to dashboard Cite

show abstract

“…where withΦ L(R)0 being the magnetic flux in an unbiased case. Note that the slope, a, can be controlled by changing β L using the tunable Josephson junction [19][20][21] .…”

Section: Squid-based Artificial Neuronsmentioning

confidence: 99%

Theoretical basis of SQUID-based artificial neurons

Katayama

Fujii

Hatakenaka

2018

Journal of Applied Physics

View full text Add to dashboard Cite

The physical basis of an artificial neuron is studied using a model that is based on the stochastic transition between two states in a double well potential. It is shown that the stochastic transition model generates an energy-defined sigmoid function acting as an activation (or transfer) function in neurons. The model is also applied to circuit neurons using superconducting quantum interference devices (SQUIDs) in artificial neural networks.

show abstract

“…We will see that such the models (see Secs. [2][3][4] are more suitable to studying the practical applications in large circuits as the previous microscopic models 18,30,31 are too cumbersome and are good only for single devices. The aims of this work are as follows.…”

Section: Introductionmentioning

confidence: 99%

Modeling Computer Memory Based on Ferromagnetic/Superconductor Multilayers

Shafraniuk¹,

Nevirkovets

Mukhanov

2019

Phys. Rev. Applied

View full text Add to dashboard Cite

A model of superconducting computer memory exploiting the orthogonal spin transfer (OST) in the pseudospin valve (PS) that is controlled by the three-terminal Josephson superconducting-ferromagnetic transistor (SFT) is developed. The building blocks of the memory are hybrid PS and SFT structures. The memory model is formulated in terms of the equation-defined PS and SFT devices integrated into the PS/SFT memory cell (MC) circuit. Logical units "0" and "1" are associated with the two PS states respectively characterized by two different values of resistance. Elementary logical operations comprising the read/write processes occur when a word pulse applied to the SFT's injector coincides with the respective bit pulse acting on MC. Physically, a word pulse triggers SFT to a resistive state, causing the PS switching between the logical "0" and "1" states. Thus, the whole switching dynamics of MC depends on the non-equilibrium and nonstationary properties of PS and SFT. Modeling the single MC as well as the larger MC-based circuits comprising respectively twelve and thirty elements suggest that such the memory cells can undergo ultrafast switching (sub-ns) and low energy consumption per operation (sub-100 fJ). The suggested model allows studying the influence of noises, punch-through effect, crosstalk, parasitic, etc. The obtained results suggest that the hybrid PS/SFT structures are well-suited to superconducting computing circuits as they are built of magnetic and non-magnetic transition metals and therefore have low impedances (1-30 ). c I achieving much better flexibility of control, as compared to a conventional Josephson junction, where the tilt is controlled only by I . (b) The time dependence of the JJ voltage   V  , where J t   is the dimensionless time, J  is the Josephson plasma frequency. Curves 1, 2, 3, and 4 are related respectively to 0.01, 0.03, 0.033 J   and 0.065. We emphasize that in SFT one can readily alter both, J  and J  by merely changing the injector current. I  for 0.05 J   (curve 1), 0.3 J   (curve 2) and 0.6 J   (curve 3). One can see the hysteresis (curve 4) that is larger for smaller J  . , , J J J J J dimensionless time, J  is the Josephson plasma frequency curves 1, 2, 3, and 4 are related respectively to 0.01, 0.03, 0.033 J   and 0.065. In Fig. 3, we show the time-averaged SFT d.c. return current curves   V  versus   I  for 0.05 J   (curve 1), 0.3 J   (curve 2) and 0.6 J   (curve 3). Remarkably, that in SFT one can readily alter both, J  and J  by merely

show abstract

Investigation of Current Gain in Superconducting-Ferromagnetic Transistors With High-j ${}_{\rm c}$ Acceptor

Cited by 8 publications

References 17 publications

Anomalous current-voltage characteristics of SFIFS Josephson junctions with weak ferromagnetic interlayers

Anomalous current-voltage characteristics of SFIFS Josephson junctions with weak ferromagnetic interlayers

Theoretical basis of SQUID-based artificial neurons

Modeling Computer Memory Based on Ferromagnetic/Superconductor Multilayers

Contact Info

Product

Resources

About