Josephson current through a ferromagnetic semiconductor/semiconductor/ferromagnetic semiconductor structure
Department of Physics, Nanjing Normal University, Nanjing, 210097, P.R. China
Corresponding author: a email@example.com
Revised: 26 January 2007
Published online: 12 April 2007
We theoretically calculate the Josephson current for two superconductor/ferromagnetic semiconductor (SC/FS) bilayers separated by a semiconductor (SM) layer. It is found that the critical Josephson current IC in the junction is strongly determined by not only the relative orientations of the effective exchange field of the two bilayers and scattering potential strengths at the interfaces but also the kinds of holes (the heavy or light) in the two FS layers. Furthermore, a robust approach to measuring the spin polarization P for the heavy and light holes is presented.
PACS: 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects / 74.45.+c – Proximity effects; Andreev effect; SN and SNS junctions / 75.50.Pp – Magnetic semiconductors
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2007