Zero-energy peak and triplet correlations in nanoscale superconductor/ferromagnet/ferromagnet spin valves

Mohammad Alidoust, Klaus Halterman, and Oriol T. Valls
Phys. Rev. B 92, 014508 – Published 17 July 2015

Abstract

Using a self-consistent Bogoliubov–de Gennes approach, we theoretically study the proximity-induced density of states (DOS) in clean SFF spin valves with noncollinear exchange fields. Our results clearly demonstrate a direct correlation between the presence of a zero-energy peak (ZEP) in the DOS spectrum and the persistence of spin-1 triplet pair correlations. By systematically varying the geometrical and material parameters governing the spin valve, we point out experimentally optimal system configurations where the ZEPs are most pronounced, and which can be effectively probed via scanning tunneling microscopy. We complement these findings in the ballistic regime by employing the Usadel formalism in the full proximity limit to investigate their diffusive SFF counterparts. We determine the optimal normalized ferromagnetic layer thicknesses which result in the largest ZEPs. Our results can serve as guidelines in designing samples for future experiments.

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  • Received 10 June 2015

DOI:https://doi.org/10.1103/PhysRevB.92.014508

©2015 American Physical Society

Authors & Affiliations

Mohammad Alidoust1,*, Klaus Halterman2,†, and Oriol T. Valls3,‡

  • 1Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
  • 2Michelson Laboratory, Physics Division, Naval Air Warfare Center, China Lake, California 93555, USA
  • 3School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA

  • *phymalidoust@gmail.com
  • klaus.halterman@navy.mil
  • Also at Minnesota Supercomputer Institute, University of Minnesota, Minneapolis, Minnesota 55455, USA; otvalls@umn.edu

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Vol. 92, Iss. 1 — 1 July 2015

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