Morphological, structural, and magnetic properties of Co nanoparticles in a silicon oxide matrix

被引：20

作者：

Diaz, M. ^{[1
]}

Martinez, L. ^{[1
]}

Ruano, M. M. ^{[1
]}

Llamosa P, D. ^{[1
]}

Roman, E. ^{[1
]}

Garcia-Hernandez, M. ^{[1
]}

Ballesteros, C. ^{[2
]}

Fermento, R. ^{[3
]}

Cebollada, A. ^{[3
]}

Armelles, G. ^{[3
]}

Huttel, Y. ^{[1
]}

机构：

[1] CSIC, ICMM, E-28049 Madrid, Spain

[2] Univ Carlos III Madrid, Dept Fis, EPS, Madrid 28911, Spain

[3] CSIC, IMM, CNM, PTM, Madrid 28760, Spain

来源：

JOURNAL OF NANOPARTICLE RESEARCH | 2011年 / 13卷 / 10期

关键词：

Cobalt; Nanoparticles; Silicon; Oxide; Matrix; Particle-wall interaction; Particle agglomeration; COBALT CLUSTERS; ANISOTROPY; BEHAVIOR;

D O I：

10.1007/s11051-011-0518-5

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We present a morphological, structural, and magnetic characterization of Co nanoparticles (mean diameter of 10.3 +/- A 1.8 nm) grown using a gas aggregation source and embedded in a silicon oxide matrix by sequential deposition of nanoparticles and silicon oxide. We show that the Co nanoparticles "soft-land" on the substrates and suffer a moderate oxidation in contact with the silicon oxide. Despite this moderate oxidation, it is found that, at room temperature, the magnetic volume of the resulting nanoparticles is below the superparamagnetic limit. The results presented in this article are compatible with the presence of an assembly of magnetically independent particles that also display a moderate exchange bias at low temperature.

引用

页码：5321 / 5333

页数：13

共 46 条

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