Comparative study of magnetic ordering in bulk and nano-grained La 0.4Ca0.6MnO3 manganite

E. Rozenberg; M. Auslender; A. I. Shames; I. Felner; E. Sominski; A. Gedanken; A. Pestun; Ya M. Mukovskii

doi:10.1109/TMAG.2008.2002197

Comparative study of magnetic ordering in bulk and nano-grained La _0.4Ca_0.6MnO₃ manganite

E. Rozenberg, M. Auslender, A. I. Shames, I. Felner, E. Sominski, A. Gedanken, A. Pestun, Ya M. Mukovskii

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

To explore the size effect in electron-doped La_0.4Ca _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.

Original language	English
Pages (from-to)	2914-2917
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	44
Issue number	11 PART 1
DOIs	https://doi.org/10.1109/TMAG.2008.2002197
State	Published - 1 Nov 2008

Keywords

Magnetic resonance
Magnetization processes
Manganese compounds
Nanotechnology

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/TMAG.2008.2002197

Cite this

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title = "Comparative study of magnetic ordering in bulk and nano-grained La 0.4Ca0.6MnO3 manganite",

abstract = "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.",

keywords = "Magnetic resonance, Magnetization processes, Manganese compounds, Nanotechnology",

author = "E. Rozenberg and M. Auslender and Shames, {A. I.} and I. Felner and E. Sominski and A. Gedanken and A. Pestun and Mukovskii, {Ya M.}",

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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 - 2008/11/1

Y1 - 2008/11/1

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.

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