Flux closure in two-dimensional magnetite nanoparticle assemblies

被引：24

作者：

Georgescu, M. ^{[1
]}

Klokkenburg, M. ^{[1
]}

Erne, B. H. ^{[1
]}

Liljeroth, P. ^{[1
]}

Vanmaekelbergh, D. ^{[1
]}

van Emmichoven, P. A. Zeijlmans ^{[1
]}

机构：

[1] Univ Utrecht, Debye Inst, NL-3508 TA Utrecht, Netherlands

来源：

PHYSICAL REVIEW B | 2006年 / 73卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.73.184415

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetic force microscopy and spectroscopy are used to study two-dimensional islands of spherical 21-nm magnetite nanoparticles. The observed repulsion of the magnetic tip at the edges of the islands is a clear sign of magnetic ordering: strong magnetic dipole-dipole interactions cause blocking of the nanoparticle dipole moments. These moments will be shown to form flux-closure structures, which is the origin of the magnetic contrast in dense two-dimensional magnetic nanoparticle assemblies.

引用

页数：5