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Nanometer Sized Effects on Magnetic Ordering in La–Ca Manganites, Probed by Magnetic Resonance

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The X-band electron paramagnetic (EPR) and ferromagnetic resonance (FMR) measurements in the temperature range 5 K–600 K were used to explore the nanometer size effects on magnetic ordering in hole- and electron-doped compounds, belonging to the prototypical system of doped manganites—La1−x Ca x MnO3 (x = 0.1, 0.3, 0.5 and 0.6). To this end, the model fittings of the temperature dependences of doubly integrated intensity and linewidth of EPR signal, as well as comparative analysis of both FMR data and the known results of neutron diffraction and magnetic measurements were performed. It appears that strongest finite-size effects are observed for low-hole-doped x = 0.1 nano-crystals due to suppression of chemical/structural disorder characteristic for bulk. The x = 0.3 and 0.5 series demonstrate well pronounced effect of core/shell spin configuration on paramagnetic spin correlations and spin dynamics, as well as on low temperature magnetic ordering. The electron-doped x = 0.6 nano-crystals differ strongly from all other considered nano-samples—the antiferromagnetic charge ordered ground state was found to be stable in this case due to, supposedly, the local nature of double exchange coupling and resulting localization of carriers.
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Keywords: DOPED LA-CA MANGANITES; ELECTRON PARAMAGNETIC RESONANCE; FERROMAGNETIC RESONANCE; MAGNETISM OF NANO-GRAINS

Document Type: Review Article

Publication date: August 1, 2011

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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