Size-dependent magnetic anisotropy of PEG coated Fe3O4 nanoparticles; Comparing two magnetization methods

C. Nayek, K. Manna, A. A. Imam, A. Y. Alqasrawi, I. M. Obaidat

Research output: Contribution to journalConference articlepeer-review

17 Citations (Scopus)


Understanding the size dependent magnetic anisotropy of iron oxide nanoparticles is essential for the successful application of these nanoparticles in several technological and medical fields. PEG-coated iron oxide (Fe3O4) nanoparticles with core diameters of 12 nm, 15 nm, and 16 nm were synthesized by the usual co-precipitation method. The morphology and structure of the nanoparticles were investigated using transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and X-ray diffraction (XRD). Magnetic measurements were conducted using a SQUID. The effective magnetic anisotropy was calculated using two methods from the magnetization measurements. In the first method the zero-field-cooled magnetization versus temperature measurements were used at several applied magnetic fields. In the second method we used the temperature-dependent coercivity curves obtained from the zero-field-cooled magnetization versus magnetic field hysteresis loops. The role of the applied magnetic field on the effective magnetic anisotropy, calculated form the zero-field-cooled magnetization versus temperature measurements, was revealed. The size dependence of the effective magnetic anisotropy constant Keff obtained by the two methods are compared and discussed.

Original languageEnglish
Article number012012
JournalIOP Conference Series: Materials Science and Engineering
Issue number1
Publication statusPublished - Mar 1 2018
Event2nd International Conference on Advanced Materials, ICAM 2017 - Irbid, Jordan
Duration: Jul 10 2017Jul 13 2017


  • Coercivity.
  • Magnetic anisotropy
  • Magnetization
  • Nanoparticles

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering


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