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- W2592296883 abstract "The magnetic properties of the superparamagnetic ferrihydrite nanoparticles that form as a result of the vital activity of Klebsiella oxytoca bacteria are studied. Both an initial powder with an average number of iron atoms NFe ~ 2000-2500 in a particle and this powder after annealing at 140°C for 3 h in air are inves� tigated. The following substantial modifications of the magnetic properties of the ferrihydrite nanoparticles are detected after annealing: the superparamagnetic blocking temperature increases from 23 to 49.5 K, and the average magnetic moment of a particle increases (as follows from the results of processing of magnetiza� tion curves). The particles have antiferromagnetic ordering, and the magnetic moment resulting in the super� paramagnetism of the system appears due to random spin decompensation inside the particle. For this mech� anism, the number of uncompensated spins is proportional to the number of magnetically active atoms raised to the onehalf power, and this relation holds true fo r the samples under study at a good accuracy. The possible causes of the detected shift of magnetic hysteresis loops at low temperatures upon field cooling are discussed." @default.
- W2592296883 created "2017-03-16" @default.
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- W2592296883 date "2014-01-01" @default.
- W2592296883 modified "2023-09-27" @default.
- W2592296883 title "ORDER, DISORDER, AND PHASE TRANSITION IN CONDENSED SYSTEM Magnetic Properties and the Mechanism of Formation of the Uncompensated Magnetic Moment of Antiferromagnetic Ferrihydrite Nanoparticles of a Bacterial Origin" @default.
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