Title :
Dynamics in Superspin Glass Systems
Author :
Peddis, Davide ; Vasilakaki, Marianna ; Trohidou, K.N. ; Fiorani, D.
Author_Institution :
Consiglio Naz. delle Ric., Inst. di Struttura della Materia, Rome, Italy
Abstract :
The out-of-equilibrium dynamical properties of two very different superspin glass systems are discussed: 1) MnFe2O4 nanoparticles, in powder form, with very strong dipolar interactions and 2) a system consisting of a film of Co particles dispersed (5%-10% volume filling fraction) in an Mn matrix, where interparticle interactions are mainly mediated by the matrix. In the latter system, the influence of interface exchange coupling between the ferromagnetic particles and the antiferromagnetic matrix on the out-of-equilibrium dynamics is discussed.
Keywords :
antiferromagnetic materials; cobalt; exchange interactions (electron); ferrites; ferromagnetic materials; interface magnetism; magnetic particles; magnetic thin films; manganese; manganese compounds; metallic thin films; nanomagnetics; nanoparticles; spin glasses; spin systems; Co-Mn; MnFe2O4; antiferromagnetic matrix; dipolar interactions; ferromagnetic particles; interface exchange coupling; interparticle interactions; nanoparticles; out-of-equilibrium dynamical properties; powder form; superspin glass systems; thin film; volume filling fraction; Aging; Frequency modulation; Glass; Magnetization; Manganese; Nanoparticles; Temperature measurement; Exchange bias (EB); out-of-equilibrium dynamics; superspin glass (SSG);
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2014.2327384
