Ideal superspin glass behaviour in a random-close-packed ensemble of maghemite nanoparticles

Highly uniform (8 nm) bare maghemite nanoparticles were pressed into a disc with a volume fraction close to the characteristic filling factor of random-close-packed ensembles of spherical particles. We review the ideal superspin glass behaviour exhibited by this material, including an onset of the a...

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Published inJournal of physics. Conference series Vol. 521; no. 1; pp. 12011 - 4
Main Authors De Toro, J A, Lee, S S, Mathieu, R, Normile, P S, Salazar, D, Cheong, J L, Muñiz, P, Riveiro, J M, Hillenkamp, M, Tamion, A, Tournus, F, Nordblad, P
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.01.2014
Subjects
Dipping
Discs
Disks
Dynamic tests
Freezing
Glass
Magnetization
Nanoparticles
Physics
Spin glass
Spin glasses
Temperature scales
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Summary:Highly uniform (8 nm) bare maghemite nanoparticles were pressed into a disc with a volume fraction close to the characteristic filling factor of random-close-packed ensembles of spherical particles. We review the ideal superspin glass behaviour exhibited by this material, including an onset of the absorption component of the ac susceptibility at the freezing transition as sharp (in a normalized temperature scale) as those observed in atomic spin glasses, narrow memory dips in the zero-field cooled magnetization, and a spin-glass characteristic field-dependence of the susceptibility. Critical exponents were extracted from static and dynamic scaling analysis.
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ISSN:1742-6588
1742-6596
1742-6596
DOI:10.1088/1742-6596/521/1/012011