Determination of energy barrier distributions of magnetic nanoparticles by temperature dependent magnetorelaxometry

被引：25

作者：

Romanus, E

Berkov, DV

Prass, S

Gross, C

Weitschies, W

Weber, P

机构：

[1] Univ Greifswald, Inst Pharm, D-17487 Greifswald, Germany

[2] Univ Jena, Inst Solid State Phys, D-07743 Jena, Germany

[3] Innovent Technol Entwicklung, D-07745 Jena, Germany

来源：

NANOTECHNOLOGY | 2003年 / 14卷 / 12期

关键词：

D O I：

10.1088/0957-4484/14/12/003

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We present a new method for the characterization of magnetic nanoparticles based on the analysis of the dependence of the Neel relaxation signal on the sample temperature. In contrast to the established characterization methods, the new method directly delivers the energy barrier distribution of the magnetic system (in the case of ferrofluid particles or their aggregates). A water based ferrofluid consisting of magnetic nanoparticles with an iron oxide core and a shell of carboxydextran has been magnetically fractionated and immobilized and the fractions have been investigated in a temperature range from 77 to 350 K. The influence of the fractionation process on the distribution of the energy barriers of the particle system has been studied qualitatively.

引用

页码：1251 / 1254

页数：4

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