Spin polarized currents in superconductor-ferromagnet and antiferromagnet-ferromagnet heterostructures

• Applicant: Professor Dr. Konstantin Efetov (†)
• Subject Area: Theoretical Condensed Matter Physics
• Term: from 2013 to 2017
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 218651856

• Final Report Year: 2016

Final Report Abstract

In conclusion, one can say that the project has been very successful. We achieved all our goals and, moreover, opened a new route of research. No difficulties arouse in the execution of announced project schedule. Our group has been pleasantly surprised about the large variety and promising potential applications of the obtained results—especially in the context of superconducting spintronics, a dynamically developing field of research with great perspectives. Here, our publications focusing on the spin currents with and without Josephson charge current should be listed. In addition, our research on the interplay of superconducting and magnetic order parameters sheds light on the mechanism of superconductivity in iron-based pnictides. Also, our investigations performed on these structures bust the research in the field of hybrid mesoscopic structures containing superconducting and magnetic layers allowing construction of highly sensitive and precise measurement instruments potentially based on novel physical features like the found within the project chirality characteristic, which raises hope for, if properly controlled, opening of a new field we may term "chiralitronics" or even "superconducting chiralitronics".

Publications

• Time-dependent equation for the magnetic order parameter near the quantum critical point in multiband superconductors with a spin-density wave. Phys. Rev. B 88, 224513 (2013)
  Moor, Andreas; Volkov, Anatoly F. & Efetov, Konstantin B.
  
• Dynamics of order parameters near stationary states in superconductors with a charge-density wave. Phys. Rev. B 90, 024511 (2014)
  Moor, Andreas; Volkov, Pavel A.; Volkov, Anatoly F. & Efetov, Konstantin B.
  
• Topological defects in systems with two competing order parameters: Application to superconductors with charge- and spin-density waves. Phys. Rev. B 90, 224512 (2014)
  Moor, Andreas; Volkov, Anatoly F. & Efetov, Konstantin B.
  
• Chirality and spin transformation of triplet Cooper pairs upon interaction with singlet condensate. Phys. Rev. B 92, 214510 (2015)
  Moor, Andreas; Volkov, Anatoly F. & Efetov, Konstantin B.
  
• Hidden order as a source of interface superconductivity. Phys. Rev. B 91, 064511 (2015)
  Moor, Andreas; Volkov, Anatoly F. & Efetov, Konstantin B.
  
• Nematic versus ferromagnetic spin filtering of triplet Cooper pairs in superconducting spintronics. Phys. Rev. B 92, 180506(R) (2015)
  Moor, Andreas; Volkov, Anatoly F. & Efetov, Konstantin B.
  
• Spin current in junctions composed of multi-band superconductors with a spin-density wave. Supercond. Sci. Technol. 28, 025011 (2015)
  Moor, Andreas; Volkov, Anatoly F. & Efetov, Konstantin B.
  
• Excess current in ferromagnet-superconductor structures with fully polarized triplet component. Phys. Rev. B 93, 174510 (2016)
  Moor, Andreas; Volkov, Anatoly F. & Efetov, Konstantin B.
  
• Josephson effect in multiterminal superconductor-ferromagnet junctions coupled via triplet components. Phys. Rev. B 93, 104525 (2016)
  Moor, Andreas; Volkov, Anatoly F. & Efetov, Konstantin B.