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Structural, magnetic and transport properties of discontinuous granular multi-layers

被引：23
作者：
Denardin, JC
Knobel, M
Dorneles, LS
Schelp, LF
机构：
[1] Univ Estadual Campinas, IFGW, Campinas, SP, Brazil
[2] UFSM, CCNE, Dept Fis, BR-97105900 Santa Maria, RS, Brazil
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2005年 / 294卷 / 02期
关键词：
granular systems; magnetic nanoparticles; superparamagnetism; spin-dependent electronic transport;
D O I：
10.1016/j.jmmm.2005.03.036
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Results of structural, magnetic and transport properties of magnetic Co/SiO2 discontinuous multi-layers produced by sequential deposition are presented. Transmission electron microscopy (TEM) images show that the samples that are close to metal-insulation transition are composed by a connected network of metallic paths, and display an enhanced Hall Effect. The granular samples are composed by an almost periodic array of Co nanoparticles, and after annealing these samples show a clear evolution in the nanostructure, with increasing average Co grain sizes and decreasing size dispersion. Relationships between the nanostructure and magnetotransport properties are discussed and compared with previous results obtained in cosputtered films. (c) 2005 Elsevier B.V. All rights reserved.
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页码：206 / 212
页数：7
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