Nanoscale ferromagnet-superconductor-ferromagnet switches controlled by magnetization orientation

Klaus Halterman, Oriol T. Valls

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

We study clean ferromagnet-superconductor-ferromagnet (FSF) nanostructures in which the magnetization of the F layers can be parallel (P) or antiparallel (AP). We consider the case where the thickness of the S layer is of order of the coherence length, with thinner F layers. We find that reversing the direction of the magnetization in one of the F layers can lead to drastic changes in the superconductor's state. Under a wide variety of conditions, the AP geometry favors superconductivity. Magnetization reversal in one of the F layers can lead to the superconductivity turning on and off, or to switching between different states. Our results are obtained via the self-consistent solution of the Bogoliubov-de Gennes equations and evaluation of the condensation energies of the system.

Original languageEnglish (US)
Article number060514
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number6
DOIs
StatePublished - Aug 1 2005

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