EFFECT OF LATTICE MISMATCH STRAINS ON THE STRUCTURAL AND MAGNETIC-PROPERTIES OF BARIUM FERRITE FILMS

The effect of substrate-induced lattice strains on the structural and magnetic properties of epitaxial barium ferrite (BaFe12O19) thin films is studied. The 5000 Angstrom thick film shows a very narrow ferromag netic resonance (FMR) line with a width of about 140 Oe. After appropr iate annealing, the linewidth measured at 58 GHz decreases to 37 Oe, w hich to the best of our knowledge is about two times smaller than the best previously reported value for epitaxial thin films. FMR studies s how that the presence of strains broadens resonance absorption. (C) 19 98 American Institute of Physics.