Nanoscale ferromagnet-superconductor-ferromagnet switches controlled by magnetization orientation

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 leads in general 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 self consistent solution of the Bogoliubov-de Gennes equations and evaluation of the condensation energies of the system.

4 pages, including 4 figures

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• Proximity Effects in Conical-Ferromagnet/Superconductor bilayers
• Induced Energy Gap in Finite-Sized Superconductor/Ferromagnet Hybrids
• Standard, inverse and triplet spin-valve effects in F1/S/F2 systems
• Tunneling conductance in Superconductor/Ferromagnet junctions: a self consistent approach
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• Electron-hole coherence in core-shell nanowires with partial proximity induced superconductivity
• Phase separation and proximity effects in itinerant ferromagnet-superconductor heterostructures