Observation of magnetic inhomogeneities in crystalline-doped manganites byelectron magnetic resonance - art. no. 172401

Electron magnetic resonance measurements were employed for studying the mag netic spin structure in bulk and crushed crystalline samples of doped La0.8 88Na0.113Mn0.997O3 and La0.833Sn0.126Mn0.997O3, and self-doped La0.94Mn0.98 O3, grown by fused-salt electrolysis. The ferromagnetic resonance exhibits a common characteristic multiline spectrum for single crystals and "noiseli ke" oscillations superimposed on ferromagnetic signal for crushed crystals. A coexistence of ferromagnetic and electron paramagnetic resonance signals was observed in a wide temperature range around T-c. The results obtained are discussed regarding the presence of inherent magnetic inhomogeneities i n studied manganites.