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Superspin glass aging behavior in textured and nontextured frozen ferrofluid

Authors :
Y. Tahri
Katsuyoshi Komatsu
Vincent Dupuis
D. L’Hôte
E. Dubois
Régine Perzynski
Sawako Nakamae
C. Crauste-Thibierge
Eric Vincent
Service de physique de l'état condensé (SPEC - UMR3680)
Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
Physicochimie des Electrolytes, Colloïdes et Sciences Analytiques (PECSA)
Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris)
Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)
Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris)
Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Source :
Journal of Applied Physics, MMM-Intermag Conference, MMM-Intermag Conference, Jan 2010, United States. pp.09E135, ⟨10.1063/1.3366615⟩
Publication Year :
2010

Abstract

The effect of magnetic anisotropy-axis alignment of individual nanoparticles on the collective aging behavior in the superspin glass state of a frozen ferrofluid has been investigated. The ferrofluid studied here consists of maghemite nanoparticles (γ-Fe2O3, mean diameter=8.6 nm) dispersed in glycerin at a volume fraction of ∼15%. The low temperature aging behavior has been explored through “zero-field cooled magnetization” (ZFCM) relaxation measurements using superconducting quantum interference device magnetometry. The ZFCM response functions were found to scale with effective age of the system in both textured and nontextured superspin glass states, but with markedly different scaling exponents, μ. The value of μ was found to shift from ∼0.9 in nontextured case to ∼0.6 in the textured case, despite the identical cooling protocol used in both experiments.

Details

Language :
English
Database :
OpenAIRE
Journal :
Journal of Applied Physics, MMM-Intermag Conference, MMM-Intermag Conference, Jan 2010, United States. pp.09E135, ⟨10.1063/1.3366615⟩
Accession number :
edsair.doi.dedup.....28e3cd0755de2fa2be888182978871c1
Full Text :
https://doi.org/10.1063/1.3366615⟩