TY - JOUR
T1 - Comparative study of magnetic ordering in bulk and nano-grained La 0.4Ca0.6MnO3 manganite
AU - Rozenberg, E.
AU - Auslender, M.
AU - Shames, A. I.
AU - Felner, I.
AU - Sominski, E.
AU - Gedanken, A.
AU - Pestun, A.
AU - Mukovskii, Ya M.
PY - 2008/11
Y1 - 2008/11
N2 - To explore the size effect in electron-doped La0.4Ca 0.6MnO3 (LCMO) compound, dc magnetic measurements and electron magnetic resonance were carried out with bulk and nano-grained LCMO in temperature ranges 5 K ≤ T ≤ 350 K and 5 K ≤ T ≤ 600 K, respectively. It appears that the antiferromagnetic, charge ordered state remains stable upon the reduction of the samples size down to nanometer scale. However, the low-temperature ferromagnetic (FM) component enhances in nano-grained LCMO as compared to its bulk counterpart, supposedly due to strong surface and inter-grain interaction effects. FM correlations in bulk and nano crystals are strong at paramagnetic (PM) state, which seems to be an electron-doping effect. The domination of ion-ion spin relaxation mechanism in PM state and drastic fading of the FM correlations upon cooling means that the doped electrons are localized in both bulk and nanograined LCMO. The notable influence of the oxygen stoichiometry on magnetic ordering in LCMO, revealed in this work, may explain the contradictive data on the magnetic state of nano-crystalline LCMO reported in the literature.
AB - To explore the size effect in electron-doped La0.4Ca 0.6MnO3 (LCMO) compound, dc magnetic measurements and electron magnetic resonance were carried out with bulk and nano-grained LCMO in temperature ranges 5 K ≤ T ≤ 350 K and 5 K ≤ T ≤ 600 K, respectively. It appears that the antiferromagnetic, charge ordered state remains stable upon the reduction of the samples size down to nanometer scale. However, the low-temperature ferromagnetic (FM) component enhances in nano-grained LCMO as compared to its bulk counterpart, supposedly due to strong surface and inter-grain interaction effects. FM correlations in bulk and nano crystals are strong at paramagnetic (PM) state, which seems to be an electron-doping effect. The domination of ion-ion spin relaxation mechanism in PM state and drastic fading of the FM correlations upon cooling means that the doped electrons are localized in both bulk and nanograined LCMO. The notable influence of the oxygen stoichiometry on magnetic ordering in LCMO, revealed in this work, may explain the contradictive data on the magnetic state of nano-crystalline LCMO reported in the literature.
KW - Magnetic resonance
KW - Magnetization processes
KW - Manganese compounds
KW - Nanotechnology
UR - http://www.scopus.com/inward/record.url?scp=65249172394&partnerID=8YFLogxK
U2 - 10.1109/TMAG.2008.2002197
DO - 10.1109/TMAG.2008.2002197
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AN - SCOPUS:65249172394
SN - 0018-9464
VL - 44
SP - 2914
EP - 2917
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 11 PART 1
ER -