Interactions and hysteresis behaviour of Fe/SiO2 nanocomposites

被引：17

作者：

Blackwell, JJ

Morales, MP

O'Grady, K

González, JM

Cebollada, F

Alonso-Sañudo, M

机构：

[1] UPM, Dep Fis Aplicada TI, EUIT Telecommun, Madrid 28031, Spain

[2] CSIC, Inst Ciencia Mat, E-28049 Madrid, Spain

[3] Univ York, York YO10 5DD, N Yorkshire, England

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2002年 / 242卷

关键词：

reversal mechanism; magnetic interactions; nanoparticles; mechanical alloying; percolation;

D O I：

10.1016/S0304-8853(01)01116-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a study of interactions in mechanically alloyed Fe/SiO2 nanocomposites. The DeltaM plots and the switching field distributions reveal that increasing Fe concentrations lead to higher dipolar fields and larger dipolarly coupled regions. We propose a switching mechanism based on avalanche phenomena triggered by the reversal of individual particles, irrespective of the Fe concentration being above or below percolation. (C) 2002 Elsevier Science B,V. All rights reserved.

引用

页码：1103 / 1105

页数：3

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