Coexistence of ferrimagnetic long-range order and cluster superparamagnetism in (formula presented)

H. Rabitz, D. Mertz, F. Celestini, J. M. Debierre, B. E. Vugmeister

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Abstract

We study numericaly and analytically a simple model for the magnetic properties of moderately impure (formula presented) (formula presented) compounds. The model largely relies on available experimental results and it is investigated by complementary methods: percolation and Monte Carlo simulations, together with random-field analytical theory. Our results conclusively show a critical change of the magnetic response above a given concentration (formula presented) We find that, beyond this concentration, the unusual features of the spontaneous magnetization observed experimentally result from the coexistence of ferrimagnetic long-range order with cluster superparamagnetism.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number9
DOIs
StatePublished - Jan 1 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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