Journal
APPLIED PHYSICS LETTERS
Volume 93, Issue 9, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2976747
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Epitaxial Y3Fe5O12 thin films were grown on (111) Gd3Ga5O12 substrates by pulsed laser deposition and subsequent annealing above 1270 K. The as-grown films deposited at temperatures below 1070 K were amorphous and the absence of trivalent iron ions has been verified by electron spin resonance spectroscopy. The ex situ annealing above 1270 K in oxygen atmosphere converted the films into epitaxial ones with ferrimagnetic properties. The higher temperature annealing up to 1670 K enabled the higher T-C and the shorter lattice constant approaching those of bulk, while the saturation magnetization stayed at 2 mu(B)/f.u. at 300 K. Slightly expanded lattice constants and reduced saturation magnetization values may originate from oxygen deficient crystal structures. Nonetheless, the epitaxial films preserved a fairly smooth surface with a root mean square roughness below 2 nm. (c) 2008 American Institute of Physics.
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