Abstract
Torque magnetometer measurements on epitaxial magnetic garnet films of nominal composition Y2.4Eu0.6Ga1.2Fe3.8O12 have identified a growth-induced noncubic magnetic anisotropy of 8000 erg/cm3 which anneals away after several hours at 1300°C. Precision x-ray measurements show that the film lattice constant changes by not more than 0.0003 Å during this annealing process. These results are similar to previous observations made on epitaxial films of other compositions but are contrary to earlier reports of Geiss et al., Klokholm et al., and Cronemeyer et al. who had concluded that the noncubic anisotropy in Y–Eu films was exclusively stress induced and who reported large changes in film lattice constants with annealing.
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