Open AccessEnhancement of Curie temperature of barium hexaferrite by dense electronic excitations
Author(s) -
Manju Sharma,
Subhash C. Kashyap,
Hem Chandra Gupta,
Mukesh C. Dimri,
K. Asokan
Publication year - 2014
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.4891647
Subject(s) - curie temperature , materials science , fluence , barium , crystallite , amorphous solid , raman spectroscopy , ion , magnetization , barium titanate , irradiation , scanning electron microscope , phase (matter) , analytical chemistry (journal) , condensed matter physics , nuclear magnetic resonance , chemistry , crystallography , ferromagnetism , ceramic , optics , physics , magnetic field , metallurgy , composite material , organic chemistry , chromatography , quantum mechanics , nuclear physics
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
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