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Ferromagnetism

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

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Related Experiment Video

Updated: Jul 19, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Versatile transmission ellipsometry to study linear ferrofluid magneto-optics.

E S Kooij¹, A C Gâlcă, B Poelsema

¹Solid State Physics group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. e.s.kooij@utwente.nl

Journal of Colloid and Interface Science

|September 26, 2006

Summary

Spectroscopic ellipsometry accurately characterizes magnetite ferrofluid magneto-optical properties. Existing models fail quantitative description, necessitating a modified nanoparticle dielectric function.

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

Published on: August 15, 2018

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Magneto-optical phenomena in ferrofluids are crucial for advanced applications.
Accurate characterization of these properties is essential for material development.
Previous studies have explored linear birefringence and dichroism in magnetic nanoparticles.

Purpose of the Study:

To simultaneously study linear birefringence and dichroism in magnetite ferrofluids.
To assess the efficacy of spectroscopic ellipsometry for characterizing magneto-optical effects.
To investigate the limitations of current models in describing experimental results.

Main Methods:

Simultaneous measurement of linear birefringence and dichroism.
Utilized spectroscopic ellipsometry in transmission mode.
Applied magnetic fields to induce and study magneto-optical responses.

Main Results:

Spectroscopic ellipsometry proved to be a highly accurate characterization technique.
Observed magnetic field-dependent and spectral dependencies aligned with previous findings.
Established models using the bulk dielectric function of magnetite failed to quantitatively match experimental data.

Conclusions:

The study highlights the capability of spectroscopic ellipsometry for precise magneto-optical characterization.
Current theoretical models require refinement to accurately describe experimental observations.
A modified dielectric function for magnetite nanoparticles is proposed as a necessary step for quantitative understanding.