Dynamic radio-frequency transverse susceptibility in magnetic nanoparticle systems

被引：36

作者：

Spinu, L ^{[1
]}

Srikanth, H ^{[1
]}

Carpenter, EE ^{[1
]}

O'Connor, CJ ^{[1
]}

机构：

[1] Univ New Orleans Lakefront, Adv Mat Res Inst, New Orleans, LA 70148 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2000年 / 87卷 / 09期

关键词：

D O I：

10.1063/1.373381

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A novel resonant method based on a tunnel-diode oscillator is used to study the dynamic transverse susceptibility in a Fe nanoparticle system. The magnetic system consists of an aggregate of nanometer-size core (Au)-shell (Fe) structure, synthesized by reverse micelle methods. Static and dynamic magnetization measurements carried out in order to characterize the system reveal a superparamagnetic behavior at high temperature. The field-dependent transverse susceptibility at radio-frequencies for different temperatures reveals distinct peak structure at characteristics fields (+/- H-K,H-C) which changes with temperature. It is proposed that relaxation processes could explain the influence of the temperature on the field dependence of the transverse susceptibility. (C) 2000 American Institute of Physics. [S0021-8979(00)31708-X].

引用

页码：5490 / 5492

页数：3

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