Structure and magnetic properties of Fe/Fe oxide clusters

被引：24

作者：

Crisan, O. ^{[1
,2
]}

von Haeften, K. ^{[1
]}

Ellis, A. M. ^{[3
]}

Binns, C. ^{[1
]}

机构：

[1] Univ Leicester, Condensed Matter Phys CMP, Leicester LE1 7RH, Leics, England

[2] Natl Inst Mat Phys, Bucharest 077125, Romania

[3] Univ Leicester, Dept Chem, Leicester LE1 7RH, Leics, England

来源：

JOURNAL OF NANOPARTICLE RESEARCH | 2008年 / 10卷 / Suppl 1期

基金：

英国工程与自然科学研究理事会;

关键词：

Magnetic nanoclusters; Gas-aggregation deposition; Core-shell nanoparticles; Exchange bias; Aerosols;

D O I：

10.1007/s11051-008-9463-3

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Fe clusters have been synthesised in ultrahigh-vacuum chamber using a gas-stabilized cluster aggregation method that ensures good control of the cluster size and naturally oxidized in order to obtain Fe/Fe oxide core-shell nanoparticles. The morphology of an individual nanoparticle, as revealed by transmission electron microscopy, consists of a Fe core of an average diameter of 4.4 nm surrounded by an oxide shell of uniform thickness of about 1.2 nm in average. The nanoparticles may be assimilated with a ferro-/antiferromagnetic (FM/AF) system. The morpho-structural features have been correlated with magnetic measurements on the core-shell nanoparticles. A significant exchange bias effect has been measured, when the sample was field-cooled under an applied field of 3 T. As the morphology of core-shell nanoclusters is much more complicated than in FM/AF bilayers of regular thickness due to the particular geometry of the coronal AF layer, the shape and surface anisotropy have to be taken into account for a correct interpretation of the magnetic data.

引用

页码：193 / 199

页数：7

共 29 条

[1] Doubly exchange-biased NiCoO/NiFe/Cu/NiFe/NiCoO spin valves [J].