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

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.

doi:10.1103/PhysRevB.96.224515

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

Journal Article · Wed Dec 27 23:00:00 EST 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.224515· OSTI ID:1472262

Glick, Joseph A. ^[1]; Edwards, Samuel ^[1]; Korucu, Demet ^[1]; Aguilar, Victor ^[1]; Niedzielski, Bethany M. ^[1]; Loloee, Reza ^[1]; Pratt, W. P. ^[1]; Birge, Norman O. ^[1]; Kotula, P. G. ^[2]; Missert, N. ^[2]

Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); Intelligence Advanced Research Projects Activity (IARPA) (United States); Army Research Office (ARO) (United States)

Grant/Contract Number:: NA0003525

OSTI ID:: 1472262

Alternate ID(s):: OSTI ID: 1416447

Report Number(s):: SAND2018--9468J; 667435

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 22 Vol. 96; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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