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

Glick, Joseph A.; Khasawneh, Mazin A.; Niedzielski, Bethany M.; Loloee, Reza; Pratt, W. P.; Birge, Norman O.; Gingrich, E. C.; Kotula, P. G.; Missert, N.

doi:10.1063/1.4989392

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

Journal Article · Fri Oct 06 00:00:00 EDT 2017 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4989392· OSTI ID:1411619

^[1]; Khasawneh, Mazin A. ^[1]; Niedzielski, Bethany M. ^[1]; Loloee, Reza ^[1]; ^[1]; ^[1]; Gingrich, E. C. ^[2]; ^[3]; Missert, N. ^[3]

Michigan State Univ., East Lansing, MI (United States). Department of Physics and Astronomy
Northrop Grumman Systems Corporation, Baltimore, MD (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

We report that 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 thicknesses. We present studies of Nb based micron-scale elliptically shaped Josephson junctions containing ferromagnetic barriers of Ni₈₁Fe₁₉ or Ni₆₅Fe₁₅Co₂₀. By applying an external magnetic field, the critical current of the junctions is 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. Lastly, we compare the data to previous work and to models of the 0-π transitions based on existing theories.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Sandia National Laboratories, null

Sponsoring Organization:: IARPA; USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1411619

Alternate ID(s):: OSTI ID: 1398292

Report Number(s):: SAND--2017-12975J; 659178

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 13 Vol. 122; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Critical Current Oscillations of Josephson Junctions Containing PdFe Nanomagnets Glick, Joseph A.; Loloee, Reza; Pratt, W. P. IEEE Transactions on Applied Superconductivity, Vol. 27, Issue 4 https://doi.org/10.1109/tasc.2016.2630024	journal	June 2017
Switchable Josephson junction based on interfacial exchange field Cascales, Juan Pedro; Takamura, Yota; Stephen, Gregory M. Applied Physics Letters, Vol. 114, Issue 2 https://doi.org/10.1063/1.5050382	journal	January 2019
Spin-valve Josephson junctions for cryogenic memory Niedzielski, Bethany M.; Bertus, T. J.; Glick, Joseph A. Physical Review B, Vol. 97, Issue 2 https://doi.org/10.1103/physrevb.97.024517	journal	January 2018
Phase control in a spin-triplet SQUID Glick, Joseph A.; Aguilar, Victor; Gougam, Adel B. Science Advances, Vol. 4, Issue 7 https://doi.org/10.1126/sciadv.aat9457	journal	July 2018
Spin-valve Josephson junctions for cryogenic memory Niedzielski, Bethany M.; Bertus, T. J.; Glick, Joseph A. arXiv https://doi.org/10.48550/arxiv.1709.04815	text	January 2017
Phase Control in a Spin-Triplet SQUID Glick, Joseph A.; Aguilar, Victor; Gougam, Adel B. arXiv https://doi.org/10.48550/arxiv.1804.00707	text	January 2018

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