Magnetic properties of La0.7Ca0.3MnO3 manganite bulk and nanometer-sized crystals

E. Rozenberg, M. I. Tsindlekht, I. Felner, E. Sominski, A. Gedanken, Ya M. Mukovskii

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18 Scopus citations

Abstract

AC and DC magnetic measurements in temperature interval 5-300 K and at external magnetic field H ≤ 5 T were employed to probe and compare magnetic ordering in bulk and nanometer-sized (15 ± 2 nm) La0.7Ca 0.3MnO3 single crystals. The respective Curie temperatures (TC) ∼ 239 K and 233 K, close to each other are observed in bulk and nano samples. While, their low T spontaneous magnetizations are strongly different, being about 3.6 and 1.2 μB/f.u., respectively. AC susceptibility (χ) of a bulk sample, measured at Hdc = 0, shows a maximum of χ(T) at T ∼ TC. In a contrast, χ(T) of the nano-sample demonstrates a broad maximum far below its TC. In the nano-sample both real and imaginary parts of χ are frequency dependent within the 5-280 K range. In a contrary, the frequency dependence is observed only for imaginary part of χ in bulk crystal. It is concluded that the similar ferromagnetic ground state exists in both considered samples; however, it is strongly frustrated in agglomerated nano particles due to surface magnetic disorder and interparticle interactions.

Original languageEnglish
Pages (from-to)3052-3054
Number of pages3
JournalIEEE Transactions on Magnetics
Volume43
Issue number6
DOIs
StatePublished - 1 Jun 2007

Keywords

  • Magnetic susceptibility
  • Magnetization processes
  • Manganese compounds
  • Nanotechnology

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