Noise Characteristics of the Optical Response of Ferrofluids to a Magnetic Field


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Abstract

The noise generated by different ferrofluid samples when probed by the fiber-optic method has been investigated. It is shown that switching on a magnetic field significantly increases the noise, which is presumably related to fluctuations accompanying the process of aggregate formation. The dependences of the rms noise on the field strength and probe-light intensity have been experimentally determined. A slow decrease in the rms noise after switching off the magnetic field has been found, which indicates relaxation of the aggregates formed by the field.

About the authors

A. V. Prokof’ev

Ioffe Physical Technical Institute, Russian Academy of Sciences

Email: ivanple@yandex.ru
Russian Federation, St. Petersburg, 194021

I. V. Pleshakov

Ioffe Physical Technical Institute, Russian Academy of Sciences; Peter the Great St. Petersburg Polytechnic University

Author for correspondence.
Email: ivanple@yandex.ru
Russian Federation, St. Petersburg, 194021; St. Petersburg, 195251

M. Shlyagin

Centro de Investigación Científica y Educación Superior de Ensenada

Email: ivanple@yandex.ru
Mexico, Ensenada

P. M. Agruzov

Ioffe Physical Technical Institute, Russian Academy of Sciences

Email: ivanple@yandex.ru
Russian Federation, St. Petersburg, 194021

E. E. Bibik

St. Petersburg State Institute of Technology

Email: ivanple@yandex.ru
Russian Federation, St. Petersburg, 190013

Yu. I. Kuz’min

Ioffe Physical Technical Institute, Russian Academy of Sciences

Email: ivanple@yandex.ru
Russian Federation, St. Petersburg, 194021

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