Electron magnetic resonance (EMR) in sonochemically prepared doped nano-manganites

A. I. Shames, E. Rozenberg, G. Gorodetsky, I. Felner, E. Sominski, G. Pang, A. Gedanken

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

X-band electron magnetic resonance method was explored for study of sonochemically prepared nano-powders of La-based doped manganites: La0.7Sr0.3MnO3 and La0.9Ca0.1MnO3 at 115 ≤ T ≤ 600 K temperature interval, including main characteristic points of its magnetic transitions. The data obtained were compared with those for crushed bulk single crystals of the same compositions. It is shown that nano-powder of La0.7Sr0.3MnO3 has the same ferromagnetic ordering as its bulk counterpart, being more homogeneous and less anisotropic. While, nano-powder of La0.9Ca0.1MnO3 shows two distinct ferromagnetic phases in a marked contrast to the bulk sample, where complex magnetic structure comprising canted antiferromagnetic matrix and ferromagnetic clusters is observed. To explain the observed phenomena, the crucial role of nano-scale grain size and its interplay with spin and charge degrees of freedom in considered systems are discussed.

Original languageEnglish
Pages (from-to)21-27
Number of pages7
JournalCurrent Applied Physics
Volume7
Issue number1
DOIs
StatePublished - Jan 2007

Bibliographical note

Funding Information:
This work was partially supported by ISF grant 485/05 and IIF. The authors thank Dr. M. Auslender for helpful discussions and Prof. Ya. Mukovskii for growing of LSMO-2 and LCMO single crystals. The authors also gratefully acknowledge Korea University’s support for the Korea University’s 100th Anniversary Symposium on the State of the Art and the Prospect of the Interdisciplinary Nano Sciences.

Keywords

  • Doped bulk and nanometer sized CMR manganites
  • Ferromagnetic and electron paramagnetic resonance

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