Magnetic interference patterns in 0−π superconductor/insulator/ferromagnet/superconductor Josephson junctions: effects of asymmetry between 0 andπregions

Kemmler, M. et al. (2010) Magnetic interference patterns in 0−π superconductor/insulator/ferromagnet/superconductor Josephson junctions: effects of asymmetry between 0 andπregions. Physical Review B, 81(5), 054522. (doi: 10.1103/PhysRevB.81.054522)

Abstract

We present a detailed analysis of the dependence of the critical current I c on an in-plane magnetic field B of 0, π , and 0 − π superconductor-insulator-ferromagnet-superconductor Josephson junctions. I c ( B ) of the 0 and the π 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 − π 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 the π 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 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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Weides, Professor Martin
• Authors: Kemmler, M., Weides, M., Weiler, M., Opel, M., Goennenwein, S.T.B., Vasenko, A.S., Golubov, A.A., Kohlstedt, H., Koelle, D., Kleiner, R., and Goldobin, E.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Physical Review B
• Publisher: American Physical Society
• ISSN: 1098-0121
• ISSN (Online): 1550-235X
• Published Online: 26 February 2010