A VARIABLE-TEMPERATURE FERROMAGNETIC-RESONANCE STUDY OF NI-ZR-SUBSTITUTED NONSTOICHIOMETRIC BARIUM FERRITE SAMPLES

Ferromagnetic resonance (FMR) was performed at X-band (9.6 GHz) on sph erical samples of polycrystalline Ni-Zr-substituted non-stoichiometric barium ferrite with several different substitution fractions and heat -treatment temperatures in the temperature range 110-295 K. Large shif ts in the FMR line positions and linewidths were observed as functions of temperature in these samples; however, their temperature variation s were observed to be opposite to each other. This is explained to be due to the large anisotropic nature of the samples. The standard theor y of FMR was invoked to provide an explanation of the data obtained. ( C) 1998 Elsevier Science B.V. All rights reserved.