Effect of Mg–Zr substitution and microwave processing on magnetic properties of barium hexaferrite

The effect of substitution of Mg–Zr for Fe in M-type barium hexaferrite (BHF) and of processing technique on the magnetic properties and microstructure has been reported in the present paper. Significant changes in magnetic properties have been observed on substituting Fe ions by Mg and Zr ions in M...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2014-09, Vol.448, p.24-28
Main Authors: Sharma, Manju, Kashyap, Subhash C., Gupta, H.C.
Format: Article
Language:English
Subjects:
Barium hexaferrite
Coercivity
Condensed matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Domain effects, magnetization curves, and hysteresis
Exact sciences and technology
Hexaferrite
Iron
Magnesium
Magnetic properties
Magnetic properties and materials
Magnetization
Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects
Microstructure
Microwave processing
Microwaves
Physics
Substitution
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Summary:The effect of substitution of Mg–Zr for Fe in M-type barium hexaferrite (BHF) and of processing technique on the magnetic properties and microstructure has been reported in the present paper. Significant changes in magnetic properties have been observed on substituting Fe ions by Mg and Zr ions in M-type barium hexaferrite, i.e. BaFe12O19 as well as by single mode microwave processing. The single mode microwave processing of the undoped sample reduced the coercivity to nearly 25% of the value for the sintered sample along with the enhancement in magnetization, thereby making it suitable for memory devices. The improvement in magnetic properties is explained on the basis of microstructure. The addition of substituents, though assisted in the formation of single phase, it, however, degraded the magnetization besides decreasing the coercivity, possibly due to substitution at the octahedral sites.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2014.04.035