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Magnetic inhomogeneities in crystalline bulk and nanometer sized La 0.7 Ca 0.3 MnO 3 : ESR probing
Author(s) -
Rozenberg E.,
Shames A. I.,
Jung G.,
Mukovskii Ya. M.,
Sominski E.,
Gedanken A.,
Lee Cheol Eui
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200777419
Subject(s) - manganite , nanometre , condensed matter physics , electron paramagnetic resonance , materials science , homogeneity (statistics) , anisotropy , homogeneous , ferromagnetism , paramagnetism , ferromagnetic resonance , ceramic , spin glass , nuclear magnetic resonance , analytical chemistry (journal) , magnetization , chemistry , physics , magnetic field , thermodynamics , statistics , mathematics , quantum mechanics , chromatography , composite material
Electron spin resonance was studied on three (two bulk and one nanometer sized) samples of the same La 0.7 Ca 0.3 MnO 3 manganite compound aiming to compare their magnetic homogeneities. The results obtained show that both ceramic and single crystalline bulk samples are less homogeneous than nano‐crystalline one. Except for higher homogeneity, the nano sample demonstrates also a weaker magnetic anisotropy. As a result, well pronounced coexistence of different magnetic phases (coexistence of ferromagnetic and paramagnetic resonance signals) is observed in bulk samples, while it is absent in nano. It is suggested that such strong difference is directly connected to the difference in structural state of the samples. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)