A New Application of the Faraday Magneto-Optical Effect for Diagnostic Measurements of Transient Magnetic Fields

Medford, R. D.; Fletcher, William H.; Herbert, J. D.; Powell, A. L. T.

doi:10.1038/192622a0

Nature

1961

DOI: 10.1038/192622a0

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A New Application of the Faraday Magneto-Optical Effect for Diagnostic Measurements of Transient Magnetic Fields

R. D. Medford

William H. Fletcher

J. D. Herbert

et al.

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2011

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“…Magneto optical effect is the change of the propagation of electromagnetic waves when a quasistatic magnetic field is applied. 1 A typical example of that is Faraday rotation, when the phase velocity of the electromagnetic field is enhanced or decreased in a particular direction due to a slowly changing or static magnetic field. 2,3 Materials such as magnetic photonic crystals, which produce large Faraday response to small applied fields, are a desirable and active area of research.…”

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Faraday rotation enhancement of gold coated Fe2O3 nanoparticles: Comparison of experiment and theory

Dani

Wang

Bossmann

et al. 2011

The Journal of Chemical Physics

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Understanding plasmonic enhancement of nanoscale magnetic materials is important to evaluate their potential for application. In this study, the Faraday rotation (FR) enhancement of gold coated Fe(2)O(3) nanoparticles (NP) is investigated experimentally and theoretically. The experiment shows that the Faraday rotation of a Fe(2)O(3) NP solution changes from approximately 3 rad/Tm to 10 rad/Tm as 5 nm gold shell is coated on a 9.7 nm Fe(2)O(3) core at 632 nm. The results also show how the volume fraction normalized Faraday rotation varies with the gold shell thickness. From the comparison of experiment and calculated Faraday rotation based on the Maxwell-Garnett theory, it is concluded that the enhancement and shell dependence of Faraday rotation of Fe(2)O(3) NPs is a result of the shifting plasmon resonance of the composite NP. In addition, the clustering of the NPs induces a different phase lag on the Faraday signal, which suggests that the collective response of the magnetic NP aggregates needs to be considered even in solution. From the Faraday phase lag, the estimated time of the full alignment of the magnetic spins of bare (cluster size 160 nm) and gold coated NPs (cluster size 90 nm) are found to be 0.65 and 0.17 μs. The calculation includes a simple theoretical approach based on the Bruggeman theory to account for the aggregation and its effect on the Faraday rotation. The Bruggeman model provides a qualitatively better agreement with the experimentally observed Faraday rotation and points out the importance of making a connection between component properties and the average "effective" optical behavior of the Faraday medium containing magnetic nanoparticles.

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confidence: 99%

Faraday rotation enhancement of gold coated Fe2O3 nanoparticles: Comparison of experiment and theory

Dani

Wang

Bossmann

et al. 2011

The Journal of Chemical Physics

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An optical magnetic probe

McCartan¹,

Barrault²

1967

J. Sci. Instrum.

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Optical methods of electrical measurement at high voltage levels

Hebner

Malewski

Cassidy³

1977

Proc. IEEE

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A New Application of the Faraday Magneto-Optical Effect for Diagnostic Measurements of Transient Magnetic Fields

Cited by 3 publications

References 4 publications

Faraday rotation enhancement of gold coated Fe2O3 nanoparticles: Comparison of experiment and theory

Faraday rotation enhancement of gold coated Fe2O3 nanoparticles: Comparison of experiment and theory

An optical magnetic probe

Optical methods of electrical measurement at high voltage levels

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