Physics – Condensed Matter – Superconductivity
Scientific paper
2009-10-30
Phys. Rev. B 81, 054522 (2010)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevB.81.054522
We present a detailed analysis of the dependence of the critical current I_c on the magnetic field B of 0, Pi, and 0-Pi superconductor-insulator-ferromagnet-superconductor Josephson junctions. I_c(B) of the 0 and Pi junction closely follows a Fraunhofer pattern, indicating a homogeneous critical current density j_c(x). The maximum of I_c(B) is slightly shifted along the field axis, pointing to a small remanent in-plane magnetization of the F-layer along the field axis. I_c(B) of the 0-Pi junction exhibits the characteristic central minimum. I_c however has a finite value here, due to an asymmetry of j_c in the 0 and Pi part. In addition, this I_c(B) exhibits asymmetric maxima and bumped minima. To explain these features in detail, flux penetration being different in the 0 part and the Pi part needs to be taken into account. We discuss this asymmetry in relation to the magnetic properties of the F-layer and the fabrication technique used to produce the 0-Pi junctions.
Goennenwein Sebastian T. B.
Goldobin Edward
Golubov Alexander A.
Kemmler Matthias
Kleiner Reinhold
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