Magnetic Interparticle Interactions and Superparamagnetic Blocking of Powder Systems of Biogenic Ferrihydrite Nanoparticles

The magnetic-field dependence of the superparamagnetic-blocking temperature T B of systems of antiferromagnetically ordered ferrihydrite nanoparticles has been investigated and analyzed. We studied two powder systems of nanoparticles: particles of “biogenic” ferrihydrite (with an average size of 2.7...

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Bibliographic Details
Published in:Journal of experimental and theoretical physics 2023-12, Vol.137 (6), p.903-913
Main Authors: Krasikov, A. A., Knyazev, Yu. V., Balaev, D. A., Stolyar, S. V., Ladygina, V. P., Balaev, A. D., Iskhakov, R. S.
Format: Article
Language:English
Subjects:
Annealing
Antiferromagnetism
Classical and Quantum Gravitation
Disorder
Elementary Particles
Iron oxides
Low temperature
Magnetic anisotropy
Magnetization
Nanoparticles
Order
Particle and Nuclear Physics
Particle interactions
Phase Transition in Condensed System
Physics
Physics and Astronomy
Powders
Quantum Field Theory
Relativity Theory
Solid State Physics
Temperature dependence
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Summary:The magnetic-field dependence of the superparamagnetic-blocking temperature T B of systems of antiferromagnetically ordered ferrihydrite nanoparticles has been investigated and analyzed. We studied two powder systems of nanoparticles: particles of “biogenic” ferrihydrite (with an average size of 2.7 nm), released as a result of vital functions of bacteria and coated with a thin organic shell, and particles of biogenic ferrihydrite subjected to low-temperature annealing, which cause an increase in the average particle size (to 3.8 nm) and burning out of the organic shell. The character of the temperature dependences of magnetization, measured after cooling in a weak field, as well as the shape of the obtained dependences T B ( H ), demonstrate peculiar features, indicating the influence of magnetic interparticle interactions. A detailed analysis of the dependences T B ( H ) within the random magnetic anisotropy model made it possible to estimate quantitatively the intensity of magnetic particle–particle interactions and determine the magnetic anisotropy constants of individual ferrihydrite particles.
ISSN:1063-7761
1090-6509
DOI:10.1134/S1063776123120075