Ferromagnetic resonance affected by a superconductor

The effect of a high-T-c superconductor on the uniform ferromagnetic resonance was experimentally studied using an YBa2Cu3O7-delta film placed onto an yttrium-iron-garnet disk. A peak in the resonance-bandwidth-temperature characteristic is revealed. The peak value is attained at a temperature slightly above T-c. The maximum bandwidth exceeds that for liquid-nitrogen temperature by a factor of 6. (C) 2000 MAIK Nauka/Interperiodica.