Controllable 0–π Josephson junctions containing a ferromagnetic spin valve

Gingrich, E. C.; Niedzielski, Bethany M.; Glick, Joseph A.; Wang, Yixing; Miller, D. L.; Loloee, Reza; Pratt, Jr., W. P.; Birge, Norman O.

doi:10.1038/NPHYS3681

Title: Controllable 0–π Josephson junctions containing a ferromagnetic spin valve

Journal Article · Mon Mar 14 00:00:00 EDT 2016 · Nature Physics

DOI:https://doi.org/10.1038/NPHYS3681· OSTI ID:1326398

Gingrich, E. C. ^[1]; Niedzielski, Bethany M. ^[1]; Glick, Joseph A. ^[1]; Wang, Yixing ^[2]; Miller, D. L. ^[3]; Loloee, Reza ^[1]; Pratt, Jr., W. P. ^[1];

^[1]

Michigan State Univ., East Lansing, MI (United States)
Michigan State Univ., East Lansing, MI (United States); Seagate Technology, Fremont, CA (United States)
Northrop Grumman Systems Corp., Baltimore, MD (United States)

Superconductivity and ferromagnetism are antagonistic forms of order, and rarely coexist. Many interesting new phenomena occur, however, in hybrid superconducting/ferromagnetic systems. 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. Such ‘π-junctions’ were first realized experimentally in 2001, and have been proposed as circuit elements for both high-speed classical superconducting computing and for quantum computing. Here we demonstrate experimentally that the phase state of a Josephson junction containing two ferromagnetic layers can be toggled between 0 and pi by changing the relative orientation of the two magnetizations. These controllable 0–π junctions have immediate applications in cryogenic memory, where they serve as a necessary component to an ultralow power superconducting computer. Such a fully superconducting computer is estimated to be orders of magnitude more energy-efficient than current semiconductor-based supercomputers. Here, phase-controllable junctions also open up new possibilities for superconducting circuit elements such as superconducting ‘programmable logic’, where they could function in superconducting analogues to field-programmable gate arrays.

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Research Organization:: Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-06ER46341

OSTI ID:: 1326398

Journal Information:: Nature Physics, Vol. 12, Issue 6; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 147 works

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