Determination of dominating relaxation mechanisms from temperature-dependent Magnetic Particle Spectroscopy measurements

被引：29

作者：

Draack, S. ^{[1
]}

Viereck, T. ^{[1
]}

Nording, F. ^{[1
]}

Janssen, K. -J. ^{[1
]}

Schilling, M. ^{[1
]}

Ludwig, F. ^{[1
]}

机构：

[1] Tech Univ Carolo Wilhelmina Braunschweig, Inst Elect Measurement Sci & Fundamental Elect En, Hans Sommer Str 66, D-38106 Braunschweig, Germany

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2019年 / 474卷

关键词：

Magnetic Particle Spectroscopy; Temperature dependence; Magnetic nanoparticles; Magnetization dynamics; Brownian relaxation; Neel relaxation; GEL;

D O I：

10.1016/j.jmmm.2018.11.023

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetic Particle Spectroscopy (MPS) is a characterization method for investigating the nonlinear properties of magnetic nanoparticles (MNP) using magnetic field strengths in the order of a few tens of millitesla. Its exploitation for particle characterization is of high significance for biomedical applications such as Magnetic Particle Imaging (MPI) and magnetic hyperthermia. Since the dynamic characteristics of MNP are influenced by both the Ned and the Brownian relaxation mechanism, harmonic spectra in MPS measurements are directly linked to ambient influences like temperature or viscosity of the surrounding medium. Experimental data of multiparametric measurements helps one to evaluate and validate mathematical models of dynamic particle magnetization. This contribution deals with the investigation of temperature-dependent harmonic spectra of different commercially available single-core and multi-core particle systems. It is shown, that dominating relaxation mechanisms can be determined from temperature-dependent MPS measurements.

引用

页码：570 / 573

页数：4

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