Effect of particle size reduction on the structural, magnetic properties and the spin excitations in ferromagnetic insulator La0.9Sr0.1MnO3 nanoparticles

摘要: The La0.9Sr0.1MnO3 (LSMO) compound was prepared by the citrate-gel method and annealed at different temperatures (H6, H8, H10 H12). X-ray diffraction (XRD), transmission electron microscopy (TEM) magnetic measurements were used to investigate particle size effects on physical properties. All samples found be single phase crystallize in rhombohedral symmetry with R3¯c space group except for H12 sample, whose refinement has revealed coexistence of both Pbnm orthorhombic phases. It also that reduction grain intensively affects properties these compounds. variation as a function may explained terms core–shell model. Curie temperature increasing is strain effect induced distortion boundaries caused strong JT coupling. dependence magnetization based thermal distribution spin waves fit results power law Tα shows deviation from Bloch low α deviates 1.50 2.88 decreases 94.9 44.98 nm. experimental 5 K interpreted framework random anisotropy From analysis approach saturation some fundamental parameters have been extracted, quantifying forces.