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TT: Fachverband Tiefe Temperaturen

TT 54: SC: Heterostructures, Andreev Scattering, Proximity Effect

TT 54.3: Talk

Thursday, March 17, 2011, 16:00–16:15, HSZ 301

Experimental Observation of the Spin Screening Effect in Superconductor/Ferromagnet Thin Film Heterostructures — •Ruslan Salikhov^1,2, Ilgiz Garifullin², Nadir Garifyanov², Lenar Tagirov³, Kurt Westerholt¹, and Hartmut Zabel¹ — ¹Experimental Physics, Ruhr-University Bochum, 44780 Bochum, Germany — ²Zavoisky Physical-Technical Institute, Russian Academy of Science, 420049 Kazan, Russia — ³Kazan State University, 420008 Kazan, Russia

We have studied the nuclear magnetic resonance (NMR) of 51V nuclei in the superconductor/ferromagnet thin film heterostructures Pd_1−xFe_x/V/Pd_1−xFe_x and Ni/V/Ni in the normal and superconducting state. Whereas the position and shape of the NMR line in the normal state for the trilayers is identical to that observed in a single V layer, in the superconducting state the line shape definitely changes, developing a systematic distortion of the high-field wing of the resonance line. By varying the thickness of the superconducting V layer for Ni/V/Ni trilayer samples we observed that the distortion of the high-field wing of the resonance line has an obvious trend to disappear with increasing V layer thickness. We consider this as the first experimental evidence for the penetration of ferromagnetism into the superconducting layer, a phenomenon which has been theoretically predicted recently and dubbed the spin screening effect.