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Title: Influence of surface spins on the magnetization of fine maghemite nanoparticles

Influence of surface spins on magnetization of maghemite nanoparticles have been studied by using SQUID measurements and also comparison done with theoretical simulations. Surface spin disorder arises in these nanoparticles due to the randomness of surface spins. A model of AC-susceptibility has been used to investigate the experimental results. The comparison between experiment and theory signifies the presence of large effective anisotropy and freezing effects on the surface of maghemite nanoparticles. The enhanced effective anisotropy constant of these nanoparticles as compared to bulk maghemite is due to presence of disordered surface spins.
Authors:
 [1] ;  [2] ;  [3]
  1. Department of Physics, International Islamic University, H-10, Islamabad (Pakistan)
  2. Institute of Physics, Karl-Franzens University Graz, Universitätsplatz 5, A-8010 Graz (Austria)
  3. Institute for Advanced Materials-Materials Process Technology, Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe (Germany)
Publication Date:
OSTI Identifier:
22261713
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1569; Journal Issue: 1; Conference: 3. international advances in applied physics and materials science congress, Antalya (Turkey), 24-28 Apr 2013; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ANISOTROPY; MAGNETIZATION; NANOSTRUCTURES; PARTICLES; SIMULATION; SPIN; SQUID DEVICES