Bi- and Al-doped DyIG(y Å)/Fe(x Å) (y=50 to 130 Å and x=5 to 15 Å) multilayer thin films were made by magnetron sputtering onto Si(111) substrates. Rapid thermal annealing was used to crystallize these garnet multilayers. The crystallized multilayer samples possess well-defined interfaces. Atomic force microscopy showed that the annealed samples had smooth surfaces, with small grain sizes (∼30 to 80 nm). All of the samples had perpendicular magnetic anisotropy with very square hysteresis loops. The coercivity was found to vary from 600 Oe to 2 kOe, depending on Fe thickness and annealing conditions. The measured figure of merit √R(θ 2K+ε2K) at 420 nm was bigger than 0.4, suggesting that Bi- and Al-doped DyIG/Fe multilayers are promising candidates for blue light magneto-optical recording applications.
ASJC Scopus subject areas
- Physics and Astronomy(all)