Effect of surface modifications on magnetic coupling in Fe nanoparticle systems

被引：14

作者：

Slawska-Waniewska, A

Roig, A

Gich, M

Casas, L

Racka, K

Nedelko, N

Molins, E

机构：

[1] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland

[2] CSIC, Inst Ciencia Mat Barcelona, Bellaterra 08193, Spain

来源：

PHYSICAL REVIEW B | 2004年 / 70卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.70.054412

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The correlation between structure and magnetic properties of Fe particles with core-shell structure (with the ratio of their linear dimensions of around 11:2 nm) has been investigated. In the as-prepared particles the surface layer, composed of small clusters of iron oxide, causes suppression of the exchange interactions and strong pinning of the core moments. Annealing leads to reconstruction of the surface layer and formation of big islands of good quality stoichiometric magnetite with sharp Verwey transition at 122 K. The exchange couplings between Fe particles across Fe3O4 interfaces are enhanced leading to long-range ferromagnetic correlations, reduction of the local anisotropy, and magnetic softening.

引用

页码：054412 / 1

页数：5

共 29 条

[1] Magnetic properties of oxide-coated iron nanoparticles synthesized by electrodeposition [J].