M-Type Hexaferrites With Enhanced Coercivity

Author

Barrera, V. ; Betancourt, I.

Author_Institution

Dept. de Mater. Metalicos y Ceramicos, Univ. Nac. Autonoma de Mexico, Mexico City, Mexico

Volume

49

Issue

8

fYear

2013

fDate

Aug. 2013

Firstpage

4630

Lastpage

4633

Abstract

In this work, we report the synthesis, structure and magnetic properties of SrFe₁₁T₁O₁₉ (T = Ga,Cr,In,Al) hexaferrite powders obtained by Pechini method. For all the samples, formation of the M-type structure was verified, together with a significant grain size coarsening, from 100 to 3000 nm. The magnetic properties include remarkable coercivity values of up to 590 kA/m, together with Curie temperatures within the range 652 K to 730 K across the compositional series. The coercivity variation was explained in terms of the evolution from single-domain magnetic particles to multidomain particles as a consequence of the significant grain growth.

Keywords

Curie temperature; coercive force; ferrites; grain growth; grain size; magnetic particles; strontium compounds; Curie temperatures; M-type hexaferrite powders; Pechini method; SrFe₁₁AlO₁₉; SrFe₁₁CrO₁₉; SrFe₁₁GaO₁₉; SrFe₁₁InO₁₉; enhanced coercivity; grain growth; grain size coarsening; multidomain particles; size 100 nm to 3000 nm; temperature 652 K to 730 K; Coercive force; Grain size; Magnetic hysteresis; Magnetic properties; Perpendicular magnetic anisotropy; Saturation magnetization; Coercive force; ferrimagnetic materials; magnetic materials; permanent magnets;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2013.2259151

Filename

6566219