Abstract
Nanocrystalline Fe oxides are compacted solids of fine particles. By compacting interfaces are formed between adjacent particles. Since collective magnetic relaxation and superparamagnetism depend on the anisotropic energy, it is expected that the existence of interfaces and related interface anisotropy will change the relaxation behavior of nanocrystalline Fe oxides. Measurements on nanocrystalline α-Fe2O3 and γ-Fe2O3 have shown that the exchange interaction in the interfaces is more effective in suppressing superparamagnetic relaxation upon compacting than the dipole interaction.
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Jing, J., Zhao, F., Yang, X. et al. Magnetic relaxation in nanocrystalline iron-oxides. Hyperfine Interact 54, 571–575 (1990). https://doi.org/10.1007/BF02396092
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DOI: https://doi.org/10.1007/BF02396092