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Atomic migration and superexchange interaction in Ni0.1Cu0.9Fe2O4

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5 Author(s)
Woo Chul Kim ; Dept. of Phys., Kookmin Univ., Seoul, South Korea ; Kim, Sam Jin ; Lee, Seung Wha ; Sang Hee Ji
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Ni0.1Cu0.9Fe2O4 was studied with X-ray diffraction and Mossbauer spectroscopy. The crystal structure was found to be a cubic spinel with the lattice constant a0=8.386±0.005 Å. The Neel temperature was determined to be TN=755 K for a heating rate of 5 K/min. The Mossbauer spectra consisted of two six-line patterns corresponding to Fe 3+ at the tetrahedral (A) and octahedral (B) sites. Debye temperatures for A and B sites were found to be 568±5 K and 194±5 K, respectively. Atomic migration of Ni0.1Cu0.9Fe2O4 starts near 350 K and increases rapidly with increasing temperature to such a degree that 71% of the ferric ions from the A sites moved to the B sites at 550 K. The temperature dependence of the magnetic hyperfine field of Ni0.1Cu0.9Fe2O4 was explained by the Neel theory of ferrimagnetism using three superexchange integrals: JA-B=-29.2 kB, JA-A=-21.9 k B, JB-B=0.5 kg

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Magnetics, IEEE Transactions on  (Volume:36 ,  Issue: 5 )