Ferromagnetic resonance investigations on styrene-butadiene-styrene barium ferrite nanocomposites

N. Ali, M. Chipara, S. Balascuta, R. Skomski, D. J. Sellmyer

Research output: Contribution to journalArticle

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Abstract

FMR measurements on barium ferrite nanoparticles (with an average length of about 13 nm) dispersed within a block copolymer (styrene-butadiene-styrene) are reported. Resonance spectra have been successfully simulated by a convolution of a Dysonian line and a Lorentzian line. The temperature dependence of FMR spectra in the so called in-the-plane and out-of the-plane configurations is reported. The angular dependence of FMR spectra at room temperature is analyzed in detail and simulated within simple thermodynamic model that takes into account the competition between shape and magnetocrystalline anisotropies. FMR data revealed that the local magnetic field acting on uncoupled electronic spin is dominated by the magnetocrystalline contribution, which eventually includes surface effects. The strong connection between FMR spectra and hysteresis loop is demonstrated.

Original languageEnglish (US)
Pages (from-to)4437-4441
Number of pages5
JournalJournal of Nanoscience and Nanotechnology
Volume9
Issue number7
DOIs
Publication statusPublished - Jul 1 2009

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Keywords

  • Barium ferrite
  • Ferromagnetic resonance
  • Magnetocrystalline anisotropy
  • Nanoparticles

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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