Title :
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
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;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2013.2259151
