Magnetic characterization of a single superparamagnetic bead by phase-sensitive micro-Hall magnetometry

被引：43

作者：

Mihajlovic, Goran ^{[1
]}

Aledealat, Khaled

Xiong, Peng

Von Molnár, Stephan

Field, Mark

Sullivan, Gerard J.

机构：

[1] Florida State Univ, MARTECH, Tallahassee, FL 32306 USA

[2] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

[3] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[4] Teledyne Sci Co LLC, Thousand Oaks, CA 91360 USA

来源：

APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 17期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.2802732

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Employing phase sensitive micro-Hall magnetometry at room temperature, we map the susceptibility of a single superparamagnetic bead, 1.2 mu m in diameter, as a function of magnetic field. We find that the dependence can be explained by modeling the bead as an ensemble of noninteracting superparamagnetic nanoparticles with log-normal distribution of magnetic moments. We also discuss the effect of possible dipolar interactions between the nanoparticles on the obtained results. (C) 2007 American Institute of Physics.

引用

页数：3

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