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EMR study of magnetic inhomogeneities in crystalline bulk and nanometer-sized La0.7Ca0.3MnO3 |
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| Authors: | AI Shames E Rozenberg YaM Mukovskii E Sominski A Gedanken |
| Institution: | aDepartment of Physics, Ben-Gurion University of the Negev, PO Box 653, Beer-Sheva 84105, Israel bMoscow Steel and Alloys Institute, Leninskii prosp. 4, Moscow 119049, Russia cDepartment of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel |
| Abstract: | Electron magnetic resonance (EMR) was studied on crystalline bulk and nanometer-sized samples of the same La0.7Ca0.3MnO3 manganite compound aiming to compare their magnetic homogeneities. The results obtained show that single-crystalline bulk sample is less homogeneous than the nanocrystalline one. Except for higher homogeneity, the nanometer-sized sample also demonstrates a weaker magnetic anisotropy. As a result, well-pronounced coexistence of different magnetic phases (coexistence of ferromagnetic and paramagnetic resonance signals) is observed in the bulk sample, while it is absent in the nanocrystalline one. It is suggested that such strong difference is directly connected to the difference in structural state of the samples. |
| Keywords: | Ferromagnetic and electron paramagnetic resonance Bulk- and nanometer-sized CMR-doped manganite |
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