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We demonstrate patterned growth of epitaxial yttrium iron garnet (YIG) thinfilms using lithographically defined templates on gadolinium gallium garnet(GGG) substrates. The fabricated YIG nanostructures yield the desiredcrystallographic orientation, excellent surface morphology, and narrowferromagnetic resonance (FMR) linewidth (~ 4 Oe). Shape-induced magneticanisotropy is clearly observed in a patterned array of nanobars engineered toexhibit the larger coercivity (40 Oe) compared with that of continuous films.Both hysteresis loop and angle-dependent FMR spectra measurements indicate thatthe easy axis aligns along the longitudinal direction of the nanobars, with aneffective anisotropy field of 195 Oe. Our work overcomes difficulties inpatterning YIG thin films and provides an effective means to control theirmagnetic properties and magnetic bias conditions.

Patterned growth of crystalline Y$_{3}$Fe$_{5}$O$_{12}$ nanostructures with engineered magnetic shape anisotropy