Investigating negative magnetization and blocking temperature in aggregates of ferrite nanoparticles

I. M. Obaidat, B. Issa, B. A. Albiss, Y. Haik

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)

Abstract

Blocking temperatures of aggregates of Mn0.5Zn0.5GdxFe(2-x)O4 ferrite nanoparticles, with x = 0.02, 0.05, 0.11, 0.15, and 0.2, were obtained from the zero-field-cooled (ZFC) magnetization measurements. We found a nonmontonic behavior of the blocking temperature with increasing size of the particles. The effective magnetic anisotropy was calculated and found to have two distinct rates of increase with decreasing the size of the particles. These results were attributed to the strong inter-particle interactions in the aggregated nanoparticles and to the enhanced role of surface anisotropy with the decrease of the size of the particles. In three samples, the ZFC magnetization was found to exhibit a significant negative magnetization in a considerable part of the low temperature region. To our knowledge, this is the first time that negative magnetization is reported in such nanoparticles. These peculiar results are discussed and are currently under investigation.

Original languageEnglish
Article number012011
JournalIOP Conference Series: Materials Science and Engineering
Volume92
Issue number1
DOIs
Publication statusPublished - Oct 12 2015
EventInternational Conference on Advanced Materials, ICAM 2015 - Irbid, Jordan
Duration: Apr 27 2015Apr 29 2015

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering

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