Critical current oscillations of elliptical Josephson junctions with single-domain ferromagnetic layers
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Laboratories, null
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); IARPA
- OSTI Identifier:
- 1411619
- Alternate Identifier(s):
- OSTI ID: 1398292
- Report Number(s):
- SAND-2017-12975J
Journal ID: ISSN 0021-8979; 659178; TRN: US1800255
- Grant/Contract Number:
- AC04-94AL85000; NA0003525
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 122; Journal Issue: 13; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Superconductivity; Josephson Junction; Ferromagnetism; Cryogenic Memory; Proximity Effect
Citation Formats
Glick, Joseph A., Khasawneh, Mazin A., Niedzielski, Bethany M., Loloee, Reza, Pratt, W. P., Birge, Norman O., Gingrich, E. C., Kotula, P. G., and Missert, N. Critical current oscillations of elliptical Josephson junctions with single-domain ferromagnetic layers. United States: N. p., 2017.
Web. doi:10.1063/1.4989392.
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. Critical current oscillations of elliptical Josephson junctions with single-domain ferromagnetic layers. United States. https://doi.org/10.1063/1.4989392
Glick, Joseph A., Khasawneh, Mazin A., Niedzielski, Bethany M., Loloee, Reza, Pratt, W. P., Birge, Norman O., Gingrich, E. C., Kotula, P. G., and Missert, N. Fri .
"Critical current oscillations of elliptical Josephson junctions with single-domain ferromagnetic layers". United States. https://doi.org/10.1063/1.4989392. https://www.osti.gov/servlets/purl/1411619.
@article{osti_1411619,
title = {Critical current oscillations of elliptical Josephson junctions with single-domain ferromagnetic layers},
author = {Glick, Joseph A. and Khasawneh, Mazin A. and Niedzielski, Bethany M. and Loloee, Reza and Pratt, W. P. and Birge, Norman O. and Gingrich, E. C. and Kotula, P. G. and Missert, N.},
abstractNote = {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.},
doi = {10.1063/1.4989392},
journal = {Journal of Applied Physics},
number = 13,
volume = 122,
place = {United States},
year = {Fri Oct 06 00:00:00 EDT 2017},
month = {Fri Oct 06 00:00:00 EDT 2017}
}
Web of Science
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