Surface spin waves in superconducting and insulating ferromagnetsV. Braude and E. B. Sonin
Racah Institute of Physics, The Hebrew University of Jerusalem Jerusalem 91904, Israel
received 18 May 2005; accepted 3 August 2005
published online 31 August 2005
Surface magnetization waves are studied in a semi-infinite magnetic medium in the perpendicular geometry. Both superconducting and insulating ferromagnets are considered. Exchange and dipole energies are taken into account, as well as retardation effects. At large wave vectors, the spectrum for a superconductor and insulator is the same, though for the former the branch is terminated much earlier than for the latter due to excitation of plasmons. At small wave vectors, the surface wave is more robust in the superconductor since it is separated from the bulk continuum by a finite gap.
75.30.Ds - Spin waves.
74.25.Nf - Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.).
74.25.Ha - Superconductivity: Magnetic properties.
© EDP Sciences 2005