Growth and ferromagnetic resonance properties of nanometer-thick yttrium iron garnet films

摘要

Growth of nm-thick yttrium iron garnet films and ferromagnetic resonance (FMR) linewidth properties in the films are reported. The films were grown on gadolinium gallium garnet substrates by pulsed laser deposition (PLD). Films in the 5-35 nm thickness range showed a (111) orientation and a surface roughness between 0.1 and 0.3nm. The 10nm films showed a 10GHz FMR linewidth of about 6Oe and a damping constant of 3.2 × 10~(-4). The FMR linewidth increases with both the surface roughness and the surface Fe deficiency. Thicker films exhibit a smaller FMR linewidth and a lower damping constant.