Dresden 2006 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
TT: Tiefe Temperaturen
TT 7: Superconductivity & Solids At Low Temperature - Poster Session
TT 7.42: Poster
Montag, 27. März 2006, 14:00–17:45, P1
Superconducting Spin Valve Effect of a V Layer Coupled to an Antiferromagnetic [Fe/V] Superlattice — •Dirk Sprungmann, Kurt Westerholt, Hartmut Zabel, R. Brucas, B. Hjörvarsson, D.A. Tikhonov, and I.A. Garifullin — Institut für Experimentalphysik/Festkörperphysik,Ruhr-Universität Bochum, 44780 Bochum, Germany
We have studied the superconducting properties of V-layers deposited
on an antiferromagnetically coupled [Fe2V11]20 superlattice (20 periods, 2
monolayers of Fe, 11 monolayers of V). The upper critical magnetic field Hc2∥ (T)
for the direction parallel to the film plane exhibits an anomalous T-dependence for magnetic
fields up to the ferromagnetic saturation field of the superlattice, indicating that the superconducting
transition temperature TS unambiguously depends on the relative magnetization orientation of
the Fe2 layers. This so called superconducting spin valve effect reaches up to 6% for the relative
difference in TS between the superlattice in ferromagnetic saturation and in the antiferromagnetic
state and is more than one order of magnitude larger than observed in similar systems before.
The shift proves, that the pair breaking effect of a ferromagnetic layer is reduced, if within the
range of the superconducting correlation length another ferromagnetic layer with antiparallel spin
orientation exists.
We acknowledge financial support through SFB 491.