Anomalous Behavior of the Coercive Force of Dilute Nickel
Ferrites NiGa_xAl_xFe_22xO₄ with a Frustrated Magnetic Structure

L. G. Antoshina* and A. B. Korshak

Physical Faculty, Moscow State University, Moscow, 119992 Russia

*e-mail: lantoshina@yandex.ru

Received July 30, 2008

Abstract—The behavior of the spontaneous magnetization _s(T) and coercive force H_c(T) of dilute nickel fer-
rites NiGa_xAl_xFe_22xO₄ (x = 0, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, and 0.8) has been studied. Above the transition tem-
perature 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 ₂ = 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.

PACS numbers: 75.50.Gg, 75.30.Et

DOI: 10.1134/S1063783409050102

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