The Faraday effect of natural and artificial ferritins
Koralewski M.1, Kłos J. W.1, Baranowski M.1, Mitróová Z.2, Kopčansk P.2, Melníková L.2, Okuda M.3, Schwarzacher W.3
- 1Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
- 2Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Kosice, Slovakia
- 3H H Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Royal Fort, BS8 1TL, Bristol, United Kingdom
Nanotechnology, 23 (35), 2012
DOI:: 10.1088/0957-4484/23/35/355704
Abstract:
Measurements of the Faraday rotation at room temperature over the light wavelength range of 300-680nm for horse spleen ferritin (HSF), magnetoferritin with different loading factors (LFs) and nanoscale magnetite and Fe 2O 3 suspensions are reported. The Faraday rotation and the magnetization of the materials studied present similar magnetic field dependences and are characteristic of a superparamagnetic system. The dependence of the Faraday rotation on the magnetic field is described, excluding HSF and Fe 2O 3, by a Langevin function with a log-normal distribution of the particle size allowing the core diameters of the substances studied to be calculated. It was found that the specific Verdet constant depends linearly on the LF. Differences in the Faraday rotation spectra and their magnetic field dependences allow discrimination between magnetoferritin with maghemite and magnetite cores which can be very useful in biomedicine. © 2012 IOP Publishing Ltd.
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