Control of Supercurrent in Hybrid Superconducting–Ferromagnetic Transistors

We report experimental results on characteristics of SFIFS junctions and multiterminal SFIFSIS and SISFIS devices (where S, I, and F denote a superconductor (Nb), an insulator (AlOx), and a ferromagnetic material (Ni), respectively). The SFIFS (SFIS) junctions serve as injectors in the SFIFSIS (SISFIS) devices, which have transistorlike properties; for this reason, we call them superconducting-ferromagnetic transistors. We have found the F (Ni) thickness at which the SFIFS current-voltage characteristic becomes linear. For three-terminal SFIFSIS devices, we focused on studying the influence of the injection current through the SFIFS junction on the maximum Josephson current of the SIS acceptor. For four-terminal SISFIS devices, we studied dependence of the transport current through the middle Nb electrode on injection current level through the SFIS junction. In both cases, we found that the output superconducting current (either Josephson or transport) can be efficiently modulated by the quasiparticle injection from SFIFS or SFIS input junction. The experiments indicate that, after optimization of the device parameters, they can be used as input/output isolators and amplifiers for memory, digital, and RF applications.

[2]  V. V. Ryazanov,et al.  Magnetic Josephson Junctions With Superconducting Interlayer for Cryogenic Memory , 2013, IEEE Transactions on Applied Superconductivity.

[3]  A. Sahu,et al.  Digital Channelizing Radio Frequency Receiver , 2007, IEEE Transactions on Applied Superconductivity.

[4]  Scalability and Design-Space Analysis of a 1T-1MTJ Memory Cell for STT-RAMs , 2012, IEEE Transactions on Electron Devices.

[5]  I. Iguchi,et al.  Transient response of a nonequilibrium superconductor to pulsed injection of quasiparticles through a tunnel barrier , 1983 .

[6]  V. V. Ryazanov,et al.  Ferromagnetic Josephson switching device with high characteristic voltage , 2012 .

[7]  Igor V. Vernik,et al.  Magnetic Josephson Junction Technology for Digital and Memory Applications , 2012 .

[8]  I. Nevirkovets.  A superconducting transistor with improved isolation between the input and output terminals , 2009 .

[9]  Karl K Berggren,et al.  A superconducting-nanowire three-terminal electrothermal device. , 2014, Nano letters.

[10]  H. Ohno,et al.  Current-induced torques in magnetic materials. , 2012, Nature materials.

[11]  J. Pekola,et al.  Josephson tunnel junction controlled by quasiparticle injection , 2004, cond-mat/0405511.

[12]  Huge nonequilibrium magnetoresistance in hybrid superconducting spin valves , 2006, cond-mat/0603555.

[13]  B. A. Huberman,et al.  Onset of an inhomogeneous state in a nonequilibrium superconducting film , 1977 .

[14]  Masato Ito,et al.  18-GHz, 4.0-aJ/bit Operation of Ultra-Low-Energy Rapid Single-Flux-Quantum Shift Registers , 2012 .

[15]  Alex F. Kirichenko,et al.  Spin-transfer switching of orthogonal spin-valve devices at cryogenic temperatures , 2014 .

[16]  Emanuela Esposito,et al.  Superconducting device with transistor-like properties including large current amplification , 2000 .

[17]  S.V. Rylov,et al.  Josephson output interfaces for RSFQ circuits , 1997, IEEE Transactions on Applied Superconductivity.

[18]  P. Yuh,et al.  A 2-kbit superconducting memory chip , 1993, IEEE Transactions on Applied Superconductivity.

[19]  Burm Baek,et al.  Hybrid superconducting-magnetic memory device using competing order parameters. , 2013, Nature communications.

[20]  S. Tahara,et al.  A 380 ps, 9.5 mW Josephson 4-Kbit RAM operated at a high bit yield , 1995, IEEE Transactions on Applied Superconductivity.

[21]  I. Nevirkovets.  A superconducting transistorlike device having good input-output isolation , 2009 .

[22]  Nathan Newman,et al.  Switching at small magnetic fields in Josephson junctions fabricated with ferromagnetic barrier layers , 2014 .

[23]  Kenneth E. Gray,et al.  A superconducting transistor , 1978 .

[24]  Joel N. Ullom,et al.  A superconducting transistor based on quasiparticle trapping , 1999 .

[25]  O. Mukhanov,et al.  Superconductivity and the environment: a Roadmap , 2013 .

[26]  Eric C. Gingrich,et al.  Use of Pd–Fe and Ni–Fe–Nb as Soft Magnetic Layers in Ferromagnetic Josephson Junctions for Nonvolatile Cryogenic Memory , 2014, IEEE Transactions on Applied Superconductivity.

[27]  O A Mukhanov,et al.  Energy-Efficient Single Flux Quantum Technology , 2011, IEEE Transactions on Applied Superconductivity.

[28]  B. Hunt,et al.  Gap suppression devices , 1985 .

[29]  John B. Ketterson,et al.  Superconducting-Ferromagnetic Transistor , 2014, IEEE Transactions on Applied Superconductivity.

[30]  William J. Gallagher,et al.  Three-terminal superconducting devices , 1985 .

[31]  S. Sarwana,et al.  Zero Static Power Dissipation Biasing of RSFQ Circuits , 2011, IEEE Transactions on Applied Superconductivity.

[32]  Anna Y. Herr,et al.  Ultra-low-power superconductor logic , 2011, 1103.4269.

[33]  Thomas Ortlepp,et al.  Access Time and Power Dissipation of a Model 256-Bit Single Flux Quantum RAM , 2014, IEEE Transactions on Applied Superconductivity.

[34]  S. Pagano,et al.  Nano-Strip Three-Terminal Superconducting Device for Cryogenic Detector Readout , 2011, IEEE Transactions on Applied Superconductivity.

[35]  A. F. Kirichenko,et al.  ERSFQ 4-to-16 Decoder for Energy-Efficient RAM , 2015, IEEE Transactions on Applied Superconductivity.

[36]  D. S. Holmes,et al.  Energy-Efficient Superconducting Computing—Power Budgets and Requirements , 2013, IEEE Transactions on Applied Superconductivity.

[37]  Anubhav Sahu,et al.  Implementation of energy efficient single flux quantum digital circuits with sub-aJ/bit operation , 2012, 1209.6383.