Energy gap of ferromagnet-superconductor bilayers

Details Energy gap of ferromagnet-superconductor bilayers Energy gap of ferromagnet-superconductor bilayers

2003-03-17

arxiv.org/abs/cond-mat/0303326v1

Physica C 397 151-158 (2003)

Physics

Condensed Matter

Superconductivity

13 pages including 5 figures

Scientific paper

10.1016/S0921-4534(03)01095-5

The excitation spectrum of clean ferromagnet-superconductor bilayers is calculated within the framework of the self-consistent Bogoliubov-de Gennes theory. Because of the proximity effect, the superconductor induces a gap in the ferromagnet spectrum, for thin ferromagnetic layers. The effect depends strongly on the exchange field in the ferromagnet. We find that as the thickness of the ferromagnetic layer increases, the gap disappears, and that its destruction arises from those quasiparticle excitations with wavevectors mainly along the interface. We discuss the influence that the interface quality and Fermi energy mismatch between the ferromagnet and superconductor have on the calculated energy gap. We also evaluate the density of states in the ferromagnet, and we find it in all cases consistent with the gap results.

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