The magnetic anisotropy constant Kl originating from the presence of Fe2+ ions in ferrites is calculated, using the theory of Wolf, for a case that the electron hopping between FeS+ and Fea+ ions is allowed within a cluster of iron ions around some lattice defects. The calculated value of Kl exhibits a characteristic temperature dependence, i.e. the change of the sign from positive a t lower temperatures to negative at higher temperatures. It is ahown that the result well agrees with the Fez+ contribution to Kl estimated from the available data of the anisotropy constant for the Nil -zFe2+z04 system.Die magnetische Anisotropiekonstante Ill in Ferriten, die in der Existenz der Fe2+-Ionen ihre Ursache hat, wird fur den Fall, daD die Elektronenwanderung von Fe2+-zu Fe3+-Ionen in einem Cluster von einigen Eisenionen um einen Gitterdefect erlaubt ist, mit der Theorie von Wolf bereohnet. Die Ergebnisse dieser Rechnungen zeigen eine charakteristische Temperaturabhiingigkeit von K,, d. h. eine Bnderung des Vorzeichens von plus bei tiefen Temperaturen zu minus fur hohere Temperaturen. Es wird gezeigt, diLB diese Ergebnisse mit dem Fe2+-Beitrag zu K,, der aus der bekannten GroDe der Anisotropiekonstante fur das System Nil -zFe2 +$04 abgeschatzt wurde, recht gut ubereinstimmt.
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