Magnetic interference patterns in 0−π superconductor/insulator/ferromagnet/superconductor Josephson junctions: Effects of asymmetry between 0 and π regions
M. Kemmler, M. Weides, M. Weiler, M. Opel, S. T. B. Goennenwein, A. S. Vasenko, A. A. Golubov, H. Kohlstedt, D. Koelle, R. Kleiner, E. Goldobin
DOI 10.1103/PhysRevB.81.054522 · Physical Review B
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Abstract
We present a detailed analysis of the dependence of the critical current Ic on an in-plane magnetic field B of 0, π, and 0−π superconductor-insulator-ferromagnet-superconductor Josephson junctions. Ic(B) of the 0 and the π junction closely follows a Fraunhofer pattern, indicating a homogeneous critical current density jc(x). The maximum of Ic(B) is slightly shifted along the field axis, pointing to a small remanent in-plane magnetization of the F-layer along the field axis. Ic(B) of the 0−π junction exhibits the characteristic central minimum. Ic, however, has a finite value here, due to an asymmetry of jc in the 0 and the π part. In addition, this Ic(B) exhibits asymmetric maxima and bumped minima. To explain these features in detail, flux penetration being different in the 0 part and the π 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−π junctions.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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