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Atomic migration in CoGaxFe2-xO4

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7 Author(s)
Lee, Seung Wha ; Sch. of Electron. Eng., Chungbuk Nat. Univ., Cheongju, South Korea ; Dong Hoi Kim ; Sung Real Hong ; Kim, Sam Jin
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Co-Ga ferrite has been studied with X-ray diffraction, vibrating sample magnetometer and Mossbauer spectroscopy. The crystal structure for this system is spinel and lattice constants is in accord with Vegard's law. The Neel temperature decreases linearly with Ga concentration suggesting the superexchange interaction Co-O-Fe link is stronger than that for the Ga-O-Fe link. Atomic migration of CoGa0.1Fe1.9O4 starts near 350 K and increases rapidly with increasing temperature to such a degree that 73% of the ferric ions as the A sites have moved to the B site by 700 K. The temperature dependence of the magnetic hyperfine field and magnetization of CoGa0.1Fe1.9O4 is explained by the Neel theory of ferrimagnetism using three superexchange integrals: JA-B=-11.5 kB, JA-A=9.8 kB, JB-B=21.3 kB

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Magnetics, IEEE Transactions on  (Volume:35 ,  Issue: 5 )