Enhancement of Curie temperature of barium hexaferrite by dense electronic excitations

Curie temperature of polycrystalline barium hexaferrite (BaFe12O19), prepared by conventional solid state technique, is anomalously and significantly enhanced (by nearly 15%) by energetic heavy ion irradiation (150 MeV, Ag12+) at ambient temperature due to dense electronic excitations Moderate fluen...

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Bibliographic Details
Published in:AIP advances 2014-07, Vol.4 (7), p.077129-077129-7
Main Authors: Sharma, Manju, Kashyap, Subhash C., Gupta, Hem C., Dimri, Mukesh C., Asokan, K.
Format: Article
Language:English
Subjects:
AMBIENT TEMPERATURE
Barium hexaferrite
CURIE POINT
Curie temperature
EXCITATION
FERRITES
Fluence
HEAVY IONS
Ion irradiation
IRRADIATION
Magnetism
MAGNETIZATION
MATERIALS SCIENCE
Phase transitions
POLYCRYSTALS
SCANNING ELECTRON MICROSCOPY
SOLIDS
Temperature
X-RAY DIFFRACTION
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Summary:Curie temperature of polycrystalline barium hexaferrite (BaFe12O19), prepared by conventional solid state technique, is anomalously and significantly enhanced (by nearly 15%) by energetic heavy ion irradiation (150 MeV, Ag12+) at ambient temperature due to dense electronic excitations Moderate fluence (1 × 1012 ions/cm2) induces structural defects giving rise to above enhancement. As established by X-ray diffraction, scanning electron microscopy and Raman studies, higher fluence (1 × 1013 ions/cm2) has structurally transformed the sample to amorphous phase with marginal change in magnetization and Curie temperature.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.4891647