Hexagonal ferrite particles for perpendicular recording prepared by ion exchange

Author

Samaras, D. ; Georgiou, J. ; Panas, S. ; Litsardakis, G.

Author_Institution

Aristotelian Univ., Thessaloniki, Greece

Volume

26

Issue

1

fYear

1990

fDate

1/1/1990 12:00:00 AM

Firstpage

18

Lastpage

20

Abstract

Particles of nonstoichiometric M-type barium hexaferrite with the chemical formula BaFe_10.5M_0.25O_17.05 (M=Mg, Cd, Co, Ni, Nd Zn) have been prepared by ion exchange in Ba containing molten salts from precursor ferrites with the β- or β"-alumina structure. The particles possess a plateletlike shape with diameters as low as 0.2 μm and as diameter-to-thickness ratio between 5 and 10. The Curie temperature is close to 470°C. Saturation magnetization values σ_s up to 64 emu g and coercive fields jH_c ranging from 0.5 to 1.5 kOe were found

Keywords

Curie temperature; barium compounds; ceramics; coercive force; ferrites; ion exchange; magnetic properties of fine particles; magnetisation; particle size; powder technology; BaFe_10.5Cd_0.25O_17.05; BaFe_10.5Co_0.25O_17.05; BaFe_10.5Mg_0.25O_17.05; BaFe_10.5Ni_0.25O_17.05; BaFe_10.5Zn_0.25O_17.05; Curie temperature; M-type hexaferrite; coercive fields; diameter-to-thickness ratio; hexagonal ferrite particles; ion exchange; nonstoichiometric; perpendicular recording; plateletlike shape; saturation magnetisation; Anisotropic magnetoresistance; Barium; Chemical engineering; Ferrites; Magnetic anisotropy; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Saturation magnetization; Temperature; Zinc;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.50477

Filename

50477