Magneto-optic measurement of Brownian relaxation of magnetic nanoparticles

Seok Hwan Chung; Marcos Grimsditch; Axel Hoffmann; Samuel D. Bader; Jin Xie; Sheng Peng; Shouheng Sun

doi:10.1016/j.jmmm.2007.05.016

Magneto-optic measurement of Brownian relaxation of magnetic nanoparticles

Seok Hwan Chung, Marcos Grimsditch, Axel Hoffmann, Samuel D. Bader, Jin Xie, Sheng Peng, Shouheng Sun

Division of Nanotechnology

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

Abstract

We demonstrate a magneto-optic technique to measure Brownian relaxation of magnetic nanoparticles suspended in liquids. We used AC susceptibility data as a function of frequency of the applied AC magnetic field to verify that the results agree with those obtained via a conventional inductive detection technique. However, compared with a commercial AC susceptometer using the conventional detection scheme, our magneto-optic setup is able to detect a density of nanoparticles at least three orders smaller. This technique has the potential of being used as a sensor for magnetic nanoparticles such as in local temperature, viscoelasticity, or molecular-binding measurements.

Original language	English
Pages (from-to)	91-95
Number of pages	5
Journal	Journal of Magnetism and Magnetic Materials
Volume	320
Issue number	3-4
DOIs	https://doi.org/10.1016/j.jmmm.2007.05.016
State	Published - Feb 2008

Bibliographical note

Funding Information:
The authors acknowledge the helpful discussions with F. Fradin. This work was supported by the US Department of Energy, Basic Energy Sciences, under Contract No. DE-AC02-06CH11357, and by NERCE 14898830458, the Salomon Award and the Frontier Research Award from Brown University.

Keywords

AC susceptibility
Biosensing
Brownian relaxation
Magnetic nanoparticle
Magneto-optic

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10.1016/j.jmmm.2007.05.016

Cite this

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title = "Magneto-optic measurement of Brownian relaxation of magnetic nanoparticles",

abstract = "We demonstrate a magneto-optic technique to measure Brownian relaxation of magnetic nanoparticles suspended in liquids. We used AC susceptibility data as a function of frequency of the applied AC magnetic field to verify that the results agree with those obtained via a conventional inductive detection technique. However, compared with a commercial AC susceptometer using the conventional detection scheme, our magneto-optic setup is able to detect a density of nanoparticles at least three orders smaller. This technique has the potential of being used as a sensor for magnetic nanoparticles such as in local temperature, viscoelasticity, or molecular-binding measurements.",

keywords = "AC susceptibility, Biosensing, Brownian relaxation, Magnetic nanoparticle, Magneto-optic",

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note = "Funding Information: The authors acknowledge the helpful discussions with F. Fradin. This work was supported by the US Department of Energy, Basic Energy Sciences, under Contract No. DE-AC02-06CH11357, and by NERCE 14898830458, the Salomon Award and the Frontier Research Award from Brown University.",

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T1 - Magneto-optic measurement of Brownian relaxation of magnetic nanoparticles

AU - Chung, Seok Hwan

AU - Grimsditch, Marcos

AU - Hoffmann, Axel

AU - Bader, Samuel D.

AU - Xie, Jin

AU - Peng, Sheng

AU - Sun, Shouheng

N1 - Funding Information: The authors acknowledge the helpful discussions with F. Fradin. This work was supported by the US Department of Energy, Basic Energy Sciences, under Contract No. DE-AC02-06CH11357, and by NERCE 14898830458, the Salomon Award and the Frontier Research Award from Brown University.

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Y1 - 2008/2

N2 - We demonstrate a magneto-optic technique to measure Brownian relaxation of magnetic nanoparticles suspended in liquids. We used AC susceptibility data as a function of frequency of the applied AC magnetic field to verify that the results agree with those obtained via a conventional inductive detection technique. However, compared with a commercial AC susceptometer using the conventional detection scheme, our magneto-optic setup is able to detect a density of nanoparticles at least three orders smaller. This technique has the potential of being used as a sensor for magnetic nanoparticles such as in local temperature, viscoelasticity, or molecular-binding measurements.

AB - We demonstrate a magneto-optic technique to measure Brownian relaxation of magnetic nanoparticles suspended in liquids. We used AC susceptibility data as a function of frequency of the applied AC magnetic field to verify that the results agree with those obtained via a conventional inductive detection technique. However, compared with a commercial AC susceptometer using the conventional detection scheme, our magneto-optic setup is able to detect a density of nanoparticles at least three orders smaller. This technique has the potential of being used as a sensor for magnetic nanoparticles such as in local temperature, viscoelasticity, or molecular-binding measurements.

KW - AC susceptibility

KW - Biosensing

KW - Brownian relaxation

KW - Magnetic nanoparticle

KW - Magneto-optic

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U2 - 10.1016/j.jmmm.2007.05.016

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JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 3-4

ER -

Magneto-optic measurement of Brownian relaxation of magnetic nanoparticles

Abstract

Bibliographical note

Keywords

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