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

Volume

50

Issue

11

fYear

2014

fDate

Nov. 2014

Firstpage

1

Lastpage

4

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);

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2014.2327384

Filename

6971627