Local Density of States and Order Parameter Configurations in Layered Ferromagnet-Superconductor Structures

Klaus Halterman; Oriol T. Valls

doi:10.1016/j.physc.2005.02.004

Local Density of States and Order Parameter Configurations in Layered Ferromagnet-Superconductor Structures

Superconductivity 2009-11-10 v1

Authors: Klaus Halterman , Oriol T. Valls

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Abstract

We analyze the local density of states (LDOS) of heterostructures consisting of alternating ferromagnet, $F$ , and superconductor, $S$ , layers. We consider structures of the $SFS$ and $SFSFSFS$ type, with thin nanometer scale $F$ and $S$ layers, within the ballistic regime. The spin-splitting effects of the ferromagnet and the mutual coupling between the $S$ regions, yield several nontrivial stable and metastable pair amplitude configurations, and we find that the details of the spatial behavior of the pair amplitude govern the calculated electronic spectra. These are reflected in discernible signatures of the LDOS. The roles that the magnetic exchange energy, interface scattering strength, and the Fermi wavevector mismatch each have on the LDOS for the different allowed junction configurations, are systematically investigated.

Keywords

local density of states ferromagnet-superconductor heterostructure pair amplitude spin-splitting Fermi wavevector mismatch

Cite

@article{arxiv.cond-mat/0411203,
  title  = {Local Density of States and Order Parameter Configurations in Layered Ferromagnet-Superconductor Structures},
  author = {Klaus Halterman and Oriol T. Valls},
  journal= {arXiv preprint arXiv:cond-mat/0411203},
  year   = {2009}
}

Comments

20 pages, 10 figures. Figures are screen captures, high resolution figures are available from either author

Local Density of States and Order Parameter Configurations in Layered Ferromagnet-Superconductor Structures

Abstract

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