Controllable Josephson current through a pseudo-spin-valve structure

Details Controllable Josephson current through a pseudo-spin-valve structure Controllable Josephson current through a pseudo-spin-valve structure

2003-09-18

arxiv.org/abs/cond-mat/0309430v1

Physics

Condensed Matter

Superconductivity

3 pages, 4 figures, (submitted to Appl. Phys. Lett.)

Scientific paper

10.1063/1.1646217

A thin Co/Cu/Permalloy (Ni$_{80}$Fe$_{20}$) pseudo-spin-valve structure is sandwiched between superconducting Nb contacts. When the current is passed perpendicular to the plane of the film a Josephson critical current ($I_C$) is observed at 4.2 K, in addition to a magnetoresistance (MR) of $\sim$ 0.5 % at high bias. The hysteresis loop of the spin-valve structure can be cycled to modulate the zero field $I_C$ of the junction in line with the MR measurements. These modulations of resistance and $I_C$ occur both smoothly and sharply with the applied field. For each type of behaviour there is a strong correlation between shape of the MR loops and the $I_C$ modulation.

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