Tatiana E. Golikova, Florian Huebler, Detlef Beckmann, Igor E. Batov, Tatiana Yu. Karminskaya, Mikhail Yu. Kupriyanov, Alexander A. Golubov, Valery V. Ryazanov
We have investigated the differential resistance of hybrid planar
Al-(Cu/Fe)-Al submicron bridges at low temperatures and in weak magnetic
fields. The structure consists of Cu/Fe-bilayer forming a bridge between two
superconducting Al-electrodes. In superconducting state of Al-electrodes, we
have observed a double-peak peculiarity in differential resistance of the
S-(N/F)-S structures at a bias voltage corresponding to the minigap. We claim
that this effect (the doubling of the minigap) is due to an electron spin
polarization in the normal metal which is induced by the ferromagnet. We have
demonstrated that the double-peak peculiarity is converted to a single peak at
a coercive applied field corresponding to zero magnetization of the Fe-layer.
View original:
http://arxiv.org/abs/1202.5460
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