Friday, July 26, 2013

1307.6742 (V. I. Zdravkov et al.)

Memory Effect and Triplet Pairing Generation in the Superconducting
Exchange Biased Co/CoOx/Cu41Ni59/Nb/Cu41Ni59 Layered Heterostructure

V. I. Zdravkov, D. Lenk, R. Morari, A. Ullrich, G. Obermeier, C. Müller, H. -A. Krug von Nidda, A. S. Sidorenko, S. Horn, R. Tidecks, L. R. Tagirov
We fabricated a nanolayered hybrid superconductor-ferromagnet spin-valve structure, the resistive state of which depends on the preceding magnetic field polarity. The effect is based on a strong exchange bias (about -2 kOe) on a diluted ferromagnetic copper-nickel alloy and generation of a long range odd in frequency triplet pairing component. The difference of high and low resistance states at zero magnetic field is 90% of the normal state resistance for a transport current of 250 {\mu}A and still around 42% for 10 {\mu}A. Both logic states of the structure do not require biasing fields or currents in the idle mode.
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