Double proximity effect in hybrid planar superconductor-(normal metal/ferromagnet)-superconductor structures

Golikova, T. E.; Huebler, F.; Beckmann, D.; Batov, I. E.; Karminskaya, T. Yu.; Kupriyanov, M. Yu.; Golubov, Alexandre Avraamovitch; Ryazanov, V. V.

doi:10.1103/physrevb.86.064416

Cited by 33 publications

(53 citation statements)

References 19 publications

(26 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the implementation of such spin-torque transfer memory devices, more complicated layer structure compared to SIS FS devices discussed in this paper would be required. The possible realization of these devices may include further development of recently demonstrated planar SN/FS junctions [56] enhanced with additional ferromagnetic and insulator layers.…”

Section: B Write Operationmentioning

confidence: 99%

Magnetic Josephson Junctions With Superconducting Interlayer for Cryogenic Memory

Vernik

Bolginov

Bakurskiy

et al. 2013

IEEE Trans. Appl. Supercond.

Self Cite

142

105

View full text Add to dashboard Cite

We investigate a Magnetic Josephson Junction (MJJ) -a superconducting device with ferromagnetic barrier for a scalable high-density cryogenic memory compatible with energyefficient single flux quantum (SFQ) circuits. The superconductorinsulator-superconductor-ferromagnet-superconductor (SIS FS) MJJs are analyzed both experimentally and theoretically. We found that the properties of SIS FS junctions fall into two distinct classes based on the thickness of S layer. We fabricate Nb-Al/AlOx-Nb-PdFe-Nb SIS FS MJJs using a co-processing approach with a combination of HYPRES and ISSP fabrication processes. The resultant SIS FS structure with thin superconducting S -layer is substantially affected by the ferromagnetic layer as a whole. We fabricate these type of junctions to reach the device compatibility with conventional SIS junctions used for superconducting SFQ electronics to ensure a seamless integration of MJJ-based circuits and SIS JJ-based ultra-fast digital SFQ circuits. We report experimental results for MJJs, demonstrating their applicability for superconducting memory and digital circuits. These MJJs exhibit I c R n product only ∼30% lower than that of conventional SIS junctions co-produced in the same fabrication. Analytical calculations for these SIS FS structures are in a good agreement with the experiment. We discuss application of MJJ devices for memory and programmable logic circuits.Index Terms-Energy efficient, memory devices, proximity effect, RAM, single flux quantum, superconducting logic elements.

show abstract

Section: B Write Operationmentioning

confidence: 99%

Magnetic Josephson Junctions With Superconducting Interlayer for Cryogenic Memory

Vernik

Bolginov

Bakurskiy

et al. 2013

IEEE Trans. Appl. Supercond.

Self Cite

142

105

View full text Add to dashboard Cite

show abstract

“…The relations (62), (63), (64) hold at all times. The baryon charges of the nuggets and anti-nuggets vary until its radius R(T ) assumes its equilibrium value as described in sections V, VI.…”

Section: A Coherent Axion Field As the Source Of Cp Violationmentioning

confidence: 99%

“…Another important comment is that each individual contribution |B baryons | ∼ |B antibaryons | entering (64) is many orders of magnitude greater than the baryon charge hidden in the form of the nuggets and anti-nuggets at earlier times when T c > T > T form . It is just their total baryon charge which is labeled as B visible and representing the net baryon charge of the visible matter is the same order of magnitude (at all times) as the net baryon charge hidden in the form of the nuggets and anti-nuggets according to (63). The baryons continue to annihilate each other (as well as baryon charge hidden in the nuggets) until the temperature reaches T form when all visible anti baryons get annihilated, while visible baryons remain in the system and represent the visible matter we observe today.…”

Section: A Coherent Axion Field As the Source Of Cp Violationmentioning

confidence: 99%

Axion field and the quark nugget’s formation at the QCD phase transition

2016

View full text Add to dashboard Cite

We study a testable dark matter (DM) model outside of the standard WIMP paradigm in which the observed ratio Ω dark Ω visible for visible and dark matter densities finds its natural explanation as a result of their common QCD origin when both types of matter (DM and visible) are formed at the QCD phase transition and both are proportional to ΛQCD. Instead of conventional "baryogenesis" mechanism we advocate a paradigm when the "baryogenesis" is actually a charge separation process which always occur in the presence of the CP odd axion field a(x). In this scenario the global baryon number of the Universe remains zero, while the unobserved anti-baryon charge is hidden in form of heavy nuggets, similar to Witten's strangelets and compromise the DM of the Universe.In the present work we study in great details a possible formation mechanism of such macroscopically large heavy objects. We argue that the nuggets will be inevitably produced during the QCD phase transition as a result of Kibble-Zurek mechanism on formation of the topological defects during a phase transition. Relevant topological defects in our scenario are the closed bubbles made of the NDW = 1 axion domain walls. These bubbles, in general, accrete the baryon (or anti baryon) charge, which eventually result in formation of the nuggets and anti-nuggets carrying a huge baryon (anti-baryon) charge. A typical size and the baryon charge of these macroscopically large objects is mainly determined by the axion mass ma. However, the main consequence of the model, Ω dark ≈ Ω visible is insensitive to the axion mass which may assume any value within the observationally allowed window 10 −6 eV ma 10 −3 eV. We also estimate the baryon to entropy ratio η ≡ nB/nγ ∼ 10 −10 within this scenario. Finally, we comment on implications of these results to the axion search experiments, including microwave cavity and the Orpheus experiments.

show abstract

“…In recent years hybrid Superconductor-Ferromagnet (SF) devices are being actively studied. The competition between superconductivity and magnetism in SF heterostructures leads to new phenomena and functionality which is interesting for variety of novel electronic and spintronic components, [9] such as phase shifters [10][11][12][13], superconducting spin valves [14][15][16][17][18][19], memory cells [20][21][22][23].…”

mentioning

confidence: 99%

Planar Superconductor-Ferromagnet-Superconductor Josephson Junctions as Scanning-Probe Sensors

2019

View full text Add to dashboard Cite

We propose a novel type of magnetic scanning probe sensor, based on a single planar Josephson junction with a magnetic barrier. The planar geometry together with high magnetic permeability of the barrier helps to focus flux in the junction and thus enhance the sensitivity of the sensor. As a result, it may outperform equally sized SQUID both in terms of the magnetic field sensitivity and the spatial resolution in one scanning direction. We fabricate and analyze experimentally sensor prototypes with a superparamagnetic CuNi and a ferromagnetic Ni barrier. We demonstrate that the planar geometry allows easy miniaturization to nm-scale, facilitates an effective utilization of the self-field phenomenon for amplification of sensitivity and a simple implementation of a control line for feed-back operation in a broad dynamic range.

show abstract

Double proximity effect in hybrid planar superconductor-(normal metal/ferromagnet)-superconductor structures

Cited by 33 publications

References 19 publications

Magnetic Josephson Junctions With Superconducting Interlayer for Cryogenic Memory

Magnetic Josephson Junctions With Superconducting Interlayer for Cryogenic Memory

Axion field and the quark nugget’s formation at the QCD phase transition

Planar Superconductor-Ferromagnet-Superconductor Josephson Junctions as Scanning-Probe Sensors

Contact Info

Product

Resources

About