Abstract
The behavior of the spontaneous magnetization σ s (T) and coercive force H c (T) of dilute nickel ferrites NiGa x Al x Fe2 − 2x O4 (x = 0, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, and 0.8) has been studied. Above the transition temperature T t , the coercive force H c is found to reveal an anomalous behavior for compositions with x ≥ 0.4, namely, the temperature dependence of the coercive force H c (T) exhibits a maximum in the range from T t to T C. For the reduced temperature θ2 = 0.8 T C, at which ferrites with the substitution x ≥ 0.4 reside in the spin glass state, the coercive force H c is observed to increase sharply with x. The assumption is made that the clusters prevailing in the spin glass state are no larger than 3 nm in size.
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Original Russian Text © L.G. Antoshina, A.B. Korshak, 2009, published in Fizika Tverdogo Tela, 2009, Vol. 51, No. 5, pp. 900–903.
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Antoshina, L.G., Korshak, A.B. Anomalous behavior of the coercive force of dilute nickel ferrites NiGa x Al x Fe2 − 2 x O4 with a frustrated magnetic structure. Phys. Solid State 51, 949–952 (2009). https://doi.org/10.1134/S1063783409050102
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DOI: https://doi.org/10.1134/S1063783409050102