Thermal variation of the relaxation time of the magnetic moment of gamma-Fe2O3 nanoparticles with interparticle interactions of various strengths

被引：270
作者：
Dormann, JL
DOrazio, F
Lucari, F
Tronc, E
Prene, P
Jolivet, JP
Fiorani, D
Cherkaoui, R
Nogues, M
机构：
[1] UNIV LAQUILA, DIPARTIMENTO FIS, I-67100 LAQUILA, ITALY
[2] UNIV PARIS 06, LAB CHIM MAT CONDENSEE, URA 1466, F-75252 PARIS 05, FRANCE
[3] IST CHIM MAT, I-00016 MONTEROTONDO, ITALY
来源：
PHYSICAL REVIEW B | 1996年 / 53卷 / 21期
关键词：
D O I：
10.1103/PhysRevB.53.14291
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The dynamical properties of gamma-Fe2O3 particles, dispersed in a polymer, were investigated by ac susceptibility (2x10(-2) Hz less than or equal to nu less than or equal to 10(4) HZ) Mossbauer spectroscopy measurements. The variation of the average blocking temperature as a function of the measuring time is satisfactorily described by a model which accounts for interparticle interactions by a statistical calculation of the dipolar energy for a disordered assembly of particles with a volume distribution and easy axes in random position.
引用
收藏
页码：14291 / 14297
页数：7
相关论文
共 20 条
[1]   THERMAL AGITATION OF SINGLE DOMAIN PARTICLES [J].
AHARONI, A .
PHYSICAL REVIEW A-GENERAL PHYSICS, 1964, 135 (2A) :A447-&
[2]   RELAXATION-TIME OF FINE MAGNETIC PARTICLES IN UNIAXIAL SYMMETRY [J].
BESSAIS, L ;
BENJAFFEL, L ;
DORMANN, JL .
PHYSICAL REVIEW B, 1992, 45 (14) :7805-7815
[3]   THERMAL FLUCTUATIONS OF A SINGLE-DOMAIN PARTICLE [J].
BROWN, WF .
PHYSICAL REVIEW, 1963, 130 (05) :1677-+
[4]   STATIC MAGNETIC-PROPERTIES AT LOW AND MEDIUM FIELD AT GAMMA-FE2O3 PARTICLES WITH CONTROLLED DISPERSION [J].
CHERKAOUI, R ;
NOGUES, M ;
DORMANN, JL ;
PRENE, P ;
TRONC, E ;
JOLIVET, JP ;
FIORANI, D ;
TESTA, AM .
IEEE TRANSACTIONS ON MAGNETICS, 1994, 30 (02) :1098-1100
[5]   SIMPLE APPROXIMATE FORMULAS FOR THE MAGNETIC-RELAXATION TIME OF SINGLE-DOMAIN FERROMAGNETIC PARTICLES WITH UNIAXIAL ANISOTROPY [J].
COFFEY, WT ;
CREGG, PJ ;
CROTHERS, DSF ;
WALDRON, JT ;
WICKSTEAD, AW .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1994, 131 (03) :L301-L303
[6]   EXACT ANALYTIC FORMULAS FOR THE CORRELATION TIMES FOR SINGLE-DOMAIN FERROMAGNETIC PARTICLES [J].
COFFEY, WT ;
CROTHERS, DSF ;
KALMYKOV, YP ;
MASSAWE, ES ;
WALDRON, JT .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1993, 127 (03) :L254-L260
[7]   EXACT ANALYTIC FORMULA FOR THE CORRELATION TIME OF A SINGLE-DOMAIN FERROMAGNETIC PARTICLE [J].
COFFEY, WT ;
CROTHERS, DSF ;
KALMYKOV, YP ;
MASSAWE, ES ;
WALDRON, JT .
PHYSICAL REVIEW E, 1994, 49 (03) :1869-1882
[8]   NANOPHASE MAGNETIC-MATERIALS - SIZE AND INTERACTION EFFECTS ON STATIC AND DYNAMICAL PROPERTIES OF FINE PARTICLES [J].
DORMANN, JL ;
FIORANI, D .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1995, 140 :415-418
[9]   MAGNETIC-PROPERTIES OF GRANULAR COMPOUNDS AND OTHER NANOSTRUCTURED MATERIALS [J].
DORMANN, JL .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1993, 168 (02) :217-224
[10]  
DORMANN JL, 1994, NATO ADV SCI INST SE, V260, P635
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