Sr. Shinde et al., Realization of epitaxial barium ferrite films of high crystalline quality with small resonance losses, J APPL PHYS, 85(10), 1999, pp. 7459-7466
We report the results of systematic studies of the effect of thin film depo
sition conditions, such as deposition temperature, oxygen pressure during d
eposition, etc., on the microstructural, magnetic, and microwave properties
of pulsed laser deposited epitaxial thin films of barium ferrite on single
crystal sapphire substrates. Ferromagnetic resonance (FMR) linewidths are
very sensitive to the presence of defects and inhomogeneities and therefore
change markedly with the variation of deposition parameters. After careful
optimization of the deposition conditions, relatively narrow resonance lin
es were realized in these films. For further improvement in the film qualit
y, these films were annealed at elevated temperatures in flowing oxygen. As
a result of the high degree of epitaxy, good stoichiometry, and reduced co
ncentration of defects, FMR linewidths as small as 37 Oe were obtained in f
ilms deposited at 920 degrees C and subsequently annealed at 1000 degrees C
in an oxygen atmosphere. (C) 1999 American Institute of Physics. [S0021-89
79(99)04806-9].