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Mechanism of the formation of an uncompensated magnetic moment in bacterial ferrihydrite nanoparticles |
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| Authors: | D A Balaev A A Dubrovskii A A Krasikov S V Stolyar R S Iskhakov V P Ladygina E D Khilazheva |
| Institution: | 1. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russia 2. Siberian Federal University, Krasnoyarsk, 660041, Russia 3. International Research Center for Studies of Extreme States of the Organism, Presidium of the Krasnoyarsk Research Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russia |
| Abstract: | The magnetic properties of antiferromagnetic nanoparticles of FeOOH · nH2O with sizes of 3–7 nm, which are products of vital functions of Klebsiella oxytoca bacteria, have been studied. Particles exhibit a superparamagnetic behavior. The characteristic blocking temperature is 23 K. Analysis of the magnetization curves shows that the mechanism of the formation of the uncompensated magnetic moment of particles is the random decompensation of magnetic moments of Fe3+ ions both on the surface and in the bulk of the antiferromagnetic particle. In this mechanism, the exchange coupling between the uncompensated magnetic moment of the particle and its antiferromagnetic “core” is implemented. It has been found that the temperature dependence of the uncompensated magnetic moment has the form 1 — constT 2. |
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