Spin glass behavior in an interacting gamma-Fe2O3 nanoparticle system

Details Spin glass behavior in an interacting gamma-Fe2O3 nanoparticle system Spin glass behavior in an interacting gamma-Fe2O3 nanoparticle system

2008-02-28

arxiv.org/abs/0802.4184v1

Physical Review B 77 (2008) 104428

Physics

Condensed Matter

Disordered Systems and Neural Networks

Scientific paper

10.1103/PhysRevB.77.104428

In this paper we investigate the superspin glass behavior of a concentrated assembly of interacting maghemite nanoparticles and compare it to that of canonical atomic spin glass systems. ac versus temperature and frequency measurements show evidence of a superspin glass transition taking place at low temperature. In order to fully characterize the superspin glass phase, the aging behavior of both the thermo-remanent magnetization (TRM) and ac susceptibility has been investigated. It is shown that the scaling laws obeyed by superspin glasses and atomic spin glasses are essentially the same, after subtraction of a superparamagnetic contribution from the superspin glass response functions. Finally, we discuss a possible origin of this superparamagnetic contribution in terms of dilute spin glass models.

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