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The effect of low-temperature heat treatment on the magnetic properties of biogenic ferrihydrite nanoparticles

Research paper by D. A. Balaev, A. A. Krasikov, A. A. Dubrovskii, O. A. Bayukov, S. V. Stolyar, R. S. Iskhakov, V. P. Ladygina, R. N. Yaroslavtsev

Indexed on: 02 Aug '15Published on: 02 Aug '15Published in: Technical Physics Letters



Abstract

We have studied the influence of low-temperature heat treatment (annealing) on the magnetic properties of superparamagnetic nanoparticles of biogenic ferrihydrite. It is established that the proposed treatment leads to an increase in the blocking temperature and magnetic susceptibility of samples. After subsequent exposure in aqueous medium, the magnetic properties of annealed sol remain constant. The character of changes in the magnetic properties of samples studied shows that low-temperature heat treatment allows nanoparticle dimensions to be increased in a controlled way.