Influence of surface spins on the magnetization of fine maghemite nanoparticles

Journal Article · Mon Dec 16 00:00:00 EST 2013 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4849291· OSTI ID:22261713

Nadeem, K. ^[1]; Krenn, H. ^[2]; Szabó, D. V. ^[3]

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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)

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.

• OSTI ID: 22261713
• Journal Information: AIP Conference Proceedings, Vol. 1569, 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); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
ANISOTROPY
MAGNETIZATION
NANOSTRUCTURES
PARTICLES
SIMULATION
SPIN
SQUID DEVICES