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11 p, 2.5 MB Crossover from individual to collective magnetism in dense nanoparticle systems : local anisotropy versus dipolar interactions / Sánchez, Elena H. (Universidad de Castilla-La Mancha. Instituto Regional de Investigacion Cientifica Aplicada) ; Vasilakaki, Marianna (Institute of Nanoscience and Nanotechnology (Atenes, Grècia)) ; Lee, Su Seong (Institute of Materials Research and Engineering. NanoBio Lab) ; Normile, Peter S. (Universidad de Castilla-La Mancha. Departamento de Física Aplicada) ; Andersson, Mikael S. (Uppsala University. Department of Chemistry) ; Mathieu, Roland (Uppsala University. Department of Materials Science and Engineering) ; López-Ortega, Alberto (Universidad de Castilla-La Mancha. Departamento de Física Aplicada) ; Pichon, Benoit P. (Institut de Physique et Chimie des Matériaux de Strasbourg) ; Peddis, Davide (Universita degli Studi di Genova. Dipartimento di Chimica e Chimica Industriale) ; Binns, Chris (Universidad de Castilla-La Mancha. Departamento de Física Aplicada) ; Nordblad, Per (Uppsala University. Department of Materials Science and Engineering) ; Trohidou, Kalliopi (Institute of Nanoscience and Nanotechnology (Atenes, Grècia)) ; Nogués, Josep (Institut Català de Nanociència i Nanotecnologia) ; De Toro, José A. (Universidad de Castilla-La Mancha. Departamento de Física Aplicada)
Dense systems of magnetic nanoparticles may exhibit dipolar collective behavior. However, two fundamental questions remain unsolved: i) whether the transition temperature may be affected by the particle anisotropy or it is essentially determined by the intensity of the interparticle dipolar interactions, and ii) what is the minimum ratio of dipole-dipole interaction (E) to nanoparticle anisotropy (KV, anisotropy⋅volume) energies necessary to crossover from individual to collective behavior. [...]
2022 - 10.1002/smll.202106762
Small, Vol. 18, issue 28 (July 2022) , art. 2106762  

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