Controllable 0–π Josephson junctions containing a ferromagnetic spin valve

Gingrich, Eric C.; Niedzielski, Bethany; Glick, Joseph; Wang, Yixing; Miller, Donald L.; Loloee, R.; Pratt, W. P.; Birge, Norman O.

doi:10.1038/nphys3681

Cited by 220 publications

(210 citation statements)

References 27 publications

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“…To develop phase-controlled S/F/N/F ′ /S memory devices one would need to fix either the F or F ′ layer to a thickness near it's respective 0-π transition, while the other layer could be kept much thinner to avoid substantial decay in I c . Then, by tuning the relative orientation of the F and F ′ magnetization vectors between parallel and anti-parallel configurations, the junction can be controllably toggled between the π and 0 phase states 18 .…”

Section: Discussionmentioning

confidence: 99%

“…two F layers whose relative magnetization directions can be switched between parallel and antiparallel 19,23,24 . We demonstrated such a controllable 0-π junction recently, using Ni and NiFe as the two ferromagnetic materials 18 . Thin Ni films are magnetically "hard", whereas NiFe is "soft", hence it was possible to reverse the magnetization direction of the NiFe without changing that of the Ni.…”

Section: Introductionmentioning

confidence: 99%

“…Our current work in this area focuses on the development of cryogenic random access memory 17,18 . Numerous ideas have been presented in the literature regarding how SFS junctions might be used as practical memory devices [19][20][21][22][23][24][25] .…”

Section: Introductionmentioning

confidence: 99%

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Critical current oscillations of elliptical Josephson junctions with single-domain ferromagnetic layers

Glick

Khasawneh

Niedzielski

et al. 2017

Journal of Applied Physics

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Josephson junctions containing ferromagnetic layers are of considerable interest for the development of practical cryogenic memory and superconducting qubits. Such junctions exhibit a ground-state phase shift of π for certain ranges of ferromagnetic layer thickness. We present studies of Nb based micron-scale ellipticallyshaped Josephson junctions containing ferromagnetic barriers of Ni 81 Fe 19 or Ni 65 Fe 15 Co 20 . By applying an external magnetic field, the critical current of the junctions are found to follow characteristic Fraunhofer patterns, and display sharp switching behavior suggestive of single-domain magnets. The high quality of the Fraunhofer patterns enables us to extract the maximum value of the critical current even when the peak is shifted significantly outside the range of the data due to the magnetic moment of the ferromagnetic layer. The maximum value of the critical current oscillates as a function of the ferromagnetic barrier thickness, indicating transitions in the phase difference across the junction between values of zero and π. We compare the data to previous work and to models of the 0-π transitions based on existing theories.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Critical current oscillations of elliptical Josephson junctions with single-domain ferromagnetic layers

Glick

Khasawneh

Niedzielski

et al. 2017

Journal of Applied Physics

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“…More recently, Gingrich et al demonstrated a 0-π controllable SQUID [50]. This SQUID consists of two SC/SV/SC junctions in a superconducting loop, and the coercive fields of the free layers in the two SVs were designed to be different.…”

Section: Josephson Junction With Spin-valve Structuresmentioning

confidence: 99%

“…Recently, another way to control the 0 and π states has been presented in Josephson junctions with a spin-valve (SV) magnetic layer; SC/SV/SC junctions [48]- [50]. The SV layer consists of two FM layers separated by a non-magnetic metal.…”

Section: Josephson Junction With Spin-valve Structuresmentioning

confidence: 99%

Phase Shift and Control in Superconducting Hybrid Structures

Yamashita

2018

IEICE Trans. Electron.

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Taro YAMASHITA†, † †a) , Member SUMMARYThe physics and applications of superconducting phase shifts and their control in superconducting systems are reviewed herein. The operation principle of almost all superconducting devices is related to the superconducting phase, and an efficient control of the phase is crucial for improving the performance and scalability. Furthermore, employing new methods to shift or control the phase may lead to the development of novel superconducting device applications, such as cryogenic memory and quantum computing devices. Recently, as a result of the progress in nanofabrication techniques, superconducting phase shifts utilizing π states have been realized. In this review, following a discussion of the basic physics of phase propagation and shifts in hybrid superconducting structures, interesting phenomena and device applications in phase-shifted superconducting systems are presented. In addition, various possibilities for developing electrically and magnetically controllable 0 and π junctions are presented; these possibilities are expected to be useful for future devices.

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Ferromagnet/Superconductor Hybridization for Magnonic Applications

Golovchanskiy

Abramov

Stolyarov

et al. 2018

Adv Funct Materials

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In this work, a new hybridization of superconducting and ferromagnetic orders is demonstrated, promising for magnonics. By measuring the ferromagnetic and spin wave resonance absorption spectra of a magnetostatically coupled permalloy/niobium bilayer at different temperatures, magnetostatic spin wave resonances with unconventional dispersion are observed. The mechanism behind the modified dispersion, confirmed with micromagnetic simulations, implies screening of the alternating magnetostatic stray fields of precessing magnetic moments in the ferromagnetic layer by the superconducting surface in the Meissner state.

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Controllable 0–π Josephson junctions containing a ferromagnetic spin valve

Cited by 220 publications

References 27 publications

Critical current oscillations of elliptical Josephson junctions with single-domain ferromagnetic layers

Critical current oscillations of elliptical Josephson junctions with single-domain ferromagnetic layers

Phase Shift and Control in Superconducting Hybrid Structures

Ferromagnet/Superconductor Hybridization for Magnonic Applications

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