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NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2021, 12 (1), P. 60–64

Weak polarization-optical responses of diluted magnetic nanofluid probed by laser radiation with polarization modulation

Ya. A. Fofanov – Institute for Analytical Instrumentation RAS, 26 Rizhsky ave., St. Petersburg, 190103, box 207, Russian Federation
I.V. Pleshakov – Ioffe Institute, 26 Politechnicheskaya str., St. Petersburg, 194021, Russian Federation; ivanple@yandex.ru
A.V. Prokof’ev – Ioffe Institute, 26 Politechnicheskaya str., St. Petersburg, 194021, Russian Federation
E. E. Bibik – St. Petersburg State Institute of Technology (Technical University), 26 Moskovsky ave., 190013, St. Petersburg, Russian Federation

A sensitive laser registration of weak polarization-optical responses was used for the investigations of dilute magnetic nanofluids. Criteria for weak and strong signals for probing of sample by laser radiation with deep modulation of polarization were considered. The magneto-optical responses of a kerosene-based fluid with magnetite nanoparticles were investigated over a wide (five orders of magnitude) range of concentrations. Weak polarization responses for this nanofluid were observed at record low volume concentrations of nanoparticles up to 10-7.

Keywords: magnetic nanofluid, laser probing, magnetooptics, weak polarization-optical response.

PACS 78.20.Ls; 75.50.Mm; 42.60.-v

DOI 10.17586/2220-8054-2021-12-1-60-64

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