Asymmetric critical current of niobium microbridges with ferromagnetic stripe

Papon, A.; Senapati, K.; Barber, Z. H.
October 2008
Applied Physics Letters;10/27/2008, Vol. 93 Issue 17, p172507
Academic Journal
A highly asymmetric current-voltage (IV) characteristic is reported in long Nb microbridges with a ferromagnetic cobalt overlayer. In the hysteretic regime, asymmetry as high as 100% was observed between forward and reverse critical currents. Such an asymmetry is a result of the competing magnetic fields produced at the edge of the bridge due to the bias current and the magnetic overlayer. While the temperature dependence of the critical current in the shallow branch of hysteretic IV curves (Ic-) followed a typical Ginzburg–Landau (GL) behavior, Ic+, the critical current of the other branch increased more sharply at low temperature. Local heating of the bridge due to the bias current was found to have no significant effect on the nature of critical current asymmetry.


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