PMID: 15245309Jul 13, 2004Paper

Spontaneous supercurrent induced by ferromagnetic pi junctions

Physical Review Letters
A BauerC Strunk

Abstract

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.

References

Feb 15, 2001·Physical Review Letters·T KontosX Grison
Apr 6, 2001·Physical Review Letters·V V RyazanovJ Aarts
Sep 13, 2002·Physical Review Letters·T KontosR Boursier
May 7, 2003·Physical Review Letters·W GuichardP Gandit

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Citations

Sep 24, 2015·Reports on Progress in Physics·Matthias Eschrig
Jun 17, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·J Wang, K S Chan
Feb 23, 2020·Beilstein Journal of Nanotechnology·Tairzhan KarabassovAndrey S Vasenko
Dec 17, 2004·Physical Review Letters·D BeckmannH V Löhneysen
Jun 13, 2009·Physical Review Letters·I Petković, M Aprili
Feb 7, 2007·Physical Review Letters·M WeidesE Goldobin
Aug 11, 2005·Physical Review Letters·M L Della RoccaP Spathis
Oct 4, 2005·Physical Review Letters·T YamashitaS Maekawa

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