A single flux quantum circuit with a ferromagnet-based Josephson π-junction

Khabipov, M.; Balashov, D; Maibaum, F.; Zorin, A. B.; Oboznov, V. A.; Bolginov, V. V.; Rossolenko, A. N.; Ryazanov, V. V.

doi:10.1088/0953-2048/23/4/045032

Cited by 63 publications

(56 citation statements)

References 22 publications

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“…That result has been confirmed by numerous groups since the initial discovery, using a wide variety of weak and strong ferromagnetic materials [3][4][5][6][7][8][9] . There have been several proposals to use π-junctions as new components in either classical or quantum information processing circuits [10][11][12][13][14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…Among a variety of layered superconducting systems, superconductor-ferromagnet (S/F) metallic hybrids attract special attention because of rich physics of these objects [7,8,9] as well as promising perspectives for their applications in superconducting spintronics [10,11,12]. Based on the unique properties of S/F hybrids, several kinds of device physics were proposed such as proximity-effect superconducting spin-switching [13,14,15,16,17] and Josephson current switching [18,19,20] actuated by an external magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical analysis of the upper critical field in ferromagnet–superconductor–ferromagnet trilayers

Antropov¹,

Kalenkov²,

Kehrle³

et al. 2013

Supercond. Sci. Technol.

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Abstract. The upper critical magnetic field H c2 in thin-film FSF trilayer spinvalve cores is studied experimentally and theoretically in geometries perpendicular and parallel to the heterostructure surface. The series of samples with variable thicknesses d F1 of the bottom and d F2 of the top Cu 41 Ni 59 F-layers are prepared in a single run, utilizing a wedge deposition technique. The critical field H c2 is measured in the temperature range 0.4 − 8 K and for magnetic fields up to 9 Tesla. A transition from oscillatory to reentrant behavior of the superconducting transition temperature versus F-layers thickness, induced by an external magnetic field, has been observed for the first time. In order to properly interpret the experimental data, we develop a quasiclassical theory, enabling one to evaluate the temperature dependence of the critical field and the superconducting transition temperature for an arbitrary set of the system parameters. A fairly good agreement between our experimental data and theoretical predictions is demonstrated for all samples, using a single set of fit parameters. This confirms adequacy of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) physics in determining the unusual superconducting properties of the studied Cu 41 Ni 59 /Nb/Cu 41 Ni 59 spin-valve core trilayers.Experimental and theoretical analysis of the upper critical field in FSF trilayers 2

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“…For example, a Josephson junction containing a ferromagnetic material can exhibit an intrinsic phase shift of π in its ground state for certain thicknesses of the material 1 . Such 'π-junctions' were first realized experimentally in 2001 (refs 2,3), and have been proposed as circuit elements for both high-speed classical superconducting computing and for quantum computing [4][5][6][7][8][9][10] . Here we demonstrate experimentally that the phase state of a Josephson junction containing two ferromagnetic layers can be toggled between 0 and π by changing the relative orientation of the two magnetizations.…”

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confidence: 99%