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Particle size-dependent superspin glass behavior in random compacts of monodisperse maghemite nanoparticles
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Industrial Engineering & Management.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Univ Castilla La Mancha, IRICA, E-13071 Ciudad Real, Spain.;Univ Castilla La Mancha, Dept Fis Aplicada, E-13071 Ciudad Real, Spain..
Inst Bioengn & Nanotechnol, 31 Biopolis Way, Singapore 138669, Singapore..
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2016 (English)In: MATERIALS RESEARCH EXPRESS, ISSN 2053-1591, Vol. 3, no 4, 045015Article in journal (Refereed) PublishedText
Abstract [en]

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
Keyword [en]
magnetic nanoparticles, maghemite, superspin glass, phase transition
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-299615DOI: 10.1088/2053-1591/3/4/045015ISI: 000377811500016OAI: oai:DiVA.org:uu-299615DiVA: diva2:949844
Funder
Swedish Research CouncilGöran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of Technology
Available from: 2016-07-25 Created: 2016-07-25 Last updated: 2016-07-25Bibliographically approved

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Andersson, Mikael SvanteMathieu, RolandNordblad, Per
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Industrial Engineering & ManagementSolid State Physics
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