The proximity e.ect between a ferromagnet and a superconductor is examined within the framework of the self-consistent Bogoliubov de Gennes equations. It is shown that for a thin ferromagnetic layer on a semi-in.nite superconductor, a spontaneous supercurrent may .ow parallel to the interface. The current turns on or off repeatedly as a function of the exchange splitting, Eex for a fixed thickness film, d. It is shown that the current state is stabilized by a lowering of the total quasiparticle kinetic energy, and this is interpreted in terms of the Andreev bound states in the ferromagnetic layer.
|Translated title of the contribution||Andreev states and spontaneous spin currents in superconductor-ferromagnet proximity systems|
|Title of host publication||Electron Correlation in New Materials and Nanosystems|
|Editors||Kurt Scharnberg, Sergei Kruchinin|
|Pages||317 - 324|
|Number of pages||8|
|Publication status||Published - 2007|