Effects of dipolar interactions on the zero-field-cooled magnetization of a nanoparticle assembly

被引:29
作者
Azeggagh, M. [1 ]
Kachkachi, H. [1 ]
机构
[1] Univ Versailles, CNRS, UMR 8635, Grp Etud Mat Condensee, F-78035 Versailles, France
关键词
D O I
10.1103/PhysRevB.75.174410
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We investigate the effect of (weak) dipolar interactions on the field behavior of the temperature at the maximum of the zero-field-cooled magnetization of a polydisperse assembly of nanoparticles. For this purpose, we extend the Gittleman-Abeles-Bozowski model for the zero-field-cooled magnetization by computing the contribution of dipolar interactions to the longitudinal relaxation time. We show, in good qualitative agreement with many experimental observations, that the temperature at the maximum of the zero-field-cooled magnetization as a function of the applied field changes from a bell-like to a monotonically decreasing curve when the intensity of the dipolar interactions, or equivalently the sample concentration, increases.
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页数:9
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共 26 条
[1]   Multidimensional energy barrier distributions of interacting magnetic particles evaluated at different magnetization states [J].
Chubykalo-Fesenko, O ;
Chantrell, RW .
JOURNAL OF APPLIED PHYSICS, 2005, 97 (10)
[2]   Effect of an oblique magnetic field on the superparamagnetic relaxation time [J].
Coffey, WT ;
Crothers, DSF ;
Dormann, JL ;
Geoghegan, LJ ;
Kalmykov, YP ;
Waldron, JT ;
Wickstead, AW .
PHYSICAL REVIEW B, 1995, 52 (22) :15951-15965
[3]   Effect of an oblique magnetic field on the superparamagnetic relaxation time. II. Influence of the gyromagnetic term [J].
Coffey, WT ;
Crothers, DSF ;
Dormann, JL ;
Geoghegan, LJ ;
Kennedy, EC .
PHYSICAL REVIEW B, 1998, 58 (06) :3249-3266
[4]   A DYNAMIC STUDY OF SMALL INTERACTING PARTICLES - SUPERPARAMAGNETIC MODEL AND SPIN-GLASS LAWS [J].
DORMANN, JL ;
BESSAIS, L ;
FIORANI, D .
JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1988, 21 (10) :2015-2034
[5]  
Dormann JL, 1997, ADV CHEM PHYS, V98, P283, DOI 10.1002/9780470141571.ch4
[6]  
EZZIR A, 1998, THESIS U PARIS SUD
[7]   Thermally activated escape rates of uniaxial spin systems with transverse field: Uniaxial crossovers [J].
Garanin, DA ;
Kennedy, EC ;
Crothers, DSF ;
Coffey, WT .
PHYSICAL REVIEW E, 1999, 60 (06) :6499-6502
[8]   Nonlinear response of superparamagnets with finite damping:: An analytical approach -: art. no. 064415 [J].
García-Palacios, JL ;
Garanin, DA .
PHYSICAL REVIEW B, 2004, 70 (06) :064415-1
[9]   On the statics and dynamics of magnetoanisotropic nanoparticles [J].
García-Palacios, JL .
ADVANCES IN CHEMICAL PHYSICS, VOL 112, 2000, 112 :1-210
[10]   SUPERPARAMAGNETISM AND RELAXATION EFFECTS IN GRANULAR NI-SIO2 AND NI-AL2O3 FILMS [J].
GITTLEMA.JI ;
ABELES, B ;
BOZOWSKI, S .
PHYSICAL REVIEW B, 1974, 9 (09) :3891-3897