NiTi substituted hexaferrites for magnetic recording

Author

Turilli, G. ; Licci, F. ; Paoluzi, A. ; Besagni, T.

Author_Institution

Inst. Maspec, CNR, Parma, Italy

Volume

24

Issue

4

fYear

1988

fDate

7/1/1988 12:00:00 AM

Firstpage

2146

Lastpage

2149

Abstract

In order to obtain hexagonal ferrites with improved characteristics for application in the field of the magnetic recording, the ferrimagnetic Sr(NiTi)_x Fe_12-2xO₁₉ 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 T_R and time τ. The reactivity of the mixtures and their magnetic characteristics (σ, H_c, H_A, T_c) 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

Keywords

ferrites; magnetic recording; nickel alloys; strontium alloys; titanium alloys; anisotropy fields; coercive field value; coercive fields; extraneous magnetic phases; hexaferrites; hexagonal ferrites; magnetic anisotropy; magnetic characteristics; magnetic recording; polydomain particles; reaction temperature; reactivity; substitution; Ferrimagnetic materials; Ferrites; Iron; Magnetic analysis; Magnetic anisotropy; Magnetic field measurement; Magnetic recording; Particle measurements; Perpendicular magnetic anisotropy; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.3418

Filename

3418