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NiTi substituted hexaferrites for magnetic recording

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4 Author(s)
Turilli, G. ; Inst. Maspec, CNR, Parma, Italy ; Licci, F. ; Paoluzi, A. ; Besagni, T.

In order to obtain hexagonal ferrites with improved characteristics for application in the field of the magnetic recording, the ferrimagnetic Sr(NiTi)x Fe12-2xO19 system is studied. Preliminary investigations suggested that NI is more effective than Co in reducing the magnetic anisotropy of hexaferrites. The system was analyzed as a function of the degree of substitution x and of the reaction temperature TR and time τ. The reactivity of the mixtures and their magnetic characteristics (σ, Hc, HA, Tc) were measured, and from the χT(H) data it was possible to distinguish between single-domain or polydomain particles. The results are presented. The influence of the extraneous magnetic phases on the coercive field value was also studied and a preliminary investigation of the relation between coercive and anisotropy fields was carried out

Published in:

Magnetics, IEEE Transactions on  (Volume:24 ,  Issue: 4 )

Date of Publication:

Jul 1988

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