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Magnetic Properties of Synthetic Eumelanin—Preliminary Results

Authors


  • This invited paper is part of the Symposium-in-Print: Melanins.

*Corresponding author email: graeff@fc.unesp.br (C. F. O. Graeff)

Abstract

We report an experimental and theoretical study of magnetic properties of synthetic eumelanin. The magnetization curves are determined by using both a vibrating sample magnetometer and a superconducting quantum interferometer device in an extended range of magnetic fields ranging from −10 kOe to 10 kOe at different temperatures. We find that the eumelanin magnetization can be qualitatively explained in terms of a simple model of dipolar spheres with an intrinsic magnetic moment. The latter one is experimentally measured by using X-band electron paramagnetic resonance. Our findings indicate that synthetic melanins are superparamagnetic.

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