Particle size-dependent superspin glass behavior in random compacts of monodisperse maghemite nanoparticles
2016 (English)In: MATERIALS RESEARCH EXPRESS, ISSN 2053-1591, Vol. 3, no 4, 045015Article in journal (Refereed) PublishedText
Dense random assemblies made from highly monodisperse gamma-Fe2O3 nanoparticles with sizes ranging from 6.2 to 11.5 nm have been investigated by DC and AC magnetometry. It is found that all assemblies undergo superspin glass phase transitions. The superspin glass phase transition temperature is strongly dependent on the particle size and the nature of the interparticle interaction. However the transition from superparamagnet to superspin glass, as evidenced by the shape of the ac-susceptibility curves and the dynamic critical exponents associated with the transition, is similar in all systems.
Place, publisher, year, edition, pages
2016. Vol. 3, no 4, 045015
magnetic nanoparticles, maghemite, superspin glass, phase transition
IdentifiersURN: urn:nbn:se:uu:diva-299615DOI: 10.1088/2053-1591/3/4/045015ISI: 000377811500016OAI: oai:DiVA.org:uu-299615DiVA: diva2:949844
FunderSwedish Research CouncilGöran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of Technology