Spontaneous supercurrent induced by ferromagnetic pi-junctions

Details Spontaneous supercurrent induced by ferromagnetic pi-junctions Spontaneous supercurrent induced by ferromagnetic pi-junctions

2003-12-05

arxiv.org/abs/cond-mat/0312165v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.92.217001

We present magnetization measurements of mesoscopic superconducting niobium loops containing a ferromagnetic (PdNi) pi-junction. The loops are prepared on top of the active area of a micro Hall-sensor based on high mobility GaAs/AlGaAs heterostructures. We observe asymmetric switching of the loop between different magnetization states when reversing the sweep direction of the magnetic field. This provides evidence for a spontaneous current induced by the intrinsic phase shift of the pi-junction. In addition, the presence of the spontaneous current near zero applied field is directly revealed by an increase of the magnetic moment with decreasing temperature, which results in half integer flux quantization in the loop at low temperatures.

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