Spin-glass behavior in an interacting γ-Fe2O3 nanoparticle system

被引：142

作者：

Parker, D. ^{[1
]}

Dupuis, V. ^{[2
]}

Ladieu, F. ^{[1
]}

Bouchaud, J. -P. ^{[1
]}

Dubois, E. ^{[2
]}

Perzynski, R. ^{[2
]}

Vincent, E. ^{[1
]}

机构：

[1] CEA, Serv Phys Etat Condense, CNRS, URA 2464,DSM DRECAM, F-91191 Gif Sur Yvette, France

[2] Univ Paris 06, CNRS, UMR 7612, LI2C,ESPCI, F-75252 Paris, France

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.77.104428

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 thermoremanent magnetization 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.

引用

页数：9

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