Abstract
Magnetization and ferromagnetic resonance (FMR) measurements near the Curie temperature have been taken from sol—gel and ceramic samples of Ln 0.67A 0.33MnO 3 (Ln Pr, La; A Ca, Sr). We demonstrate that the demagnetizing fields arising from the pores in polycrystalline samples cause the FMR line broadening observed below 1.1 T C , with respect to the values of the equivalent single crystals.
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