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Title: Spin-triplet supercurrent in Josephson junctions containing a synthetic antiferromagnet with perpendicular magnetic anisotropy

Abstract

In this paper, we present measurements of Josephson junctions containing three magnetic layers with noncollinear magnetizations. The junctions are of the form S / F ' / N / F / N / F " / S , where S is superconducting Nb, F ' is either a thin Ni or Permalloy layer with in-plane magnetization, N is the normal metal Cu, F is a synthetic antiferromagnet with magnetization perpendicular to the plane, composed of Pd/Co multilayers on either side of a thin Ru spacer, and F " is a thin Ni layer with in-plane magnetization. The supercurrent in these junctions decays more slowly as a function of the F -layer thickness than for similar spin-singlet junctions not containing the F ' and F " layers. The slower decay is the prime signature that the supercurrent in the central part of these junctions is carried by spin-triplet pairs. Finally, the junctions containing F ' = Permalloy are suitable for future experiments where either the amplitude of the critical current or the ground-state phase difference across the junction is controlled by changing the relative orientations of the magnetizations of the F ' and F " layers.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2]
  1. Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Michigan State Univ., East Lansing, MI (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); Intelligence Advanced Research Projects Activity (IARPA) (United States); US Army Research Office (ARO)
OSTI Identifier:
1472262
Alternate Identifier(s):
OSTI ID: 1416447
Report Number(s):
SAND2018-9468J
Journal ID: ISSN 2469-9950; 667435
Grant/Contract Number:  
NA0003525; W911NF-14-C-0115
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 22; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ferromagnetism; Josephson effect; spin-triplet pairing; superconductivity

Citation Formats

Glick, Joseph A., Edwards, Samuel, Korucu, Demet, Aguilar, Victor, Niedzielski, Bethany M., Loloee, Reza, Pratt, W. P., Birge, Norman O., Kotula, P. G., and Missert, N. Spin-triplet supercurrent in Josephson junctions containing a synthetic antiferromagnet with perpendicular magnetic anisotropy. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.224515.
Glick, Joseph A., Edwards, Samuel, Korucu, Demet, Aguilar, Victor, Niedzielski, Bethany M., Loloee, Reza, Pratt, W. P., Birge, Norman O., Kotula, P. G., & Missert, N. Spin-triplet supercurrent in Josephson junctions containing a synthetic antiferromagnet with perpendicular magnetic anisotropy. United States. doi:10.1103/PhysRevB.96.224515.
Glick, Joseph A., Edwards, Samuel, Korucu, Demet, Aguilar, Victor, Niedzielski, Bethany M., Loloee, Reza, Pratt, W. P., Birge, Norman O., Kotula, P. G., and Missert, N. Thu . "Spin-triplet supercurrent in Josephson junctions containing a synthetic antiferromagnet with perpendicular magnetic anisotropy". United States. doi:10.1103/PhysRevB.96.224515. https://www.osti.gov/servlets/purl/1472262.
@article{osti_1472262,
title = {Spin-triplet supercurrent in Josephson junctions containing a synthetic antiferromagnet with perpendicular magnetic anisotropy},
author = {Glick, Joseph A. and Edwards, Samuel and Korucu, Demet and Aguilar, Victor and Niedzielski, Bethany M. and Loloee, Reza and Pratt, W. P. and Birge, Norman O. and Kotula, P. G. and Missert, N.},
abstractNote = {In this paper, we present measurements of Josephson junctions containing three magnetic layers with noncollinear magnetizations. The junctions are of the form S/F'/N/F/N/F"/S, where S is superconducting Nb, F' is either a thin Ni or Permalloy layer with in-plane magnetization, N is the normal metal Cu, F is a synthetic antiferromagnet with magnetization perpendicular to the plane, composed of Pd/Co multilayers on either side of a thin Ru spacer, and F" is a thin Ni layer with in-plane magnetization. The supercurrent in these junctions decays more slowly as a function of the F-layer thickness than for similar spin-singlet junctions not containing the F' and F" layers. The slower decay is the prime signature that the supercurrent in the central part of these junctions is carried by spin-triplet pairs. Finally, the junctions containing F'= Permalloy are suitable for future experiments where either the amplitude of the critical current or the ground-state phase difference across the junction is controlled by changing the relative orientations of the magnetizations of the F' and F" layers.},
doi = {10.1103/PhysRevB.96.224515},
journal = {Physical Review B},
number = 22,
volume = 96,
place = {United States},
year = {2017},
month = {12}
}

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