Enhancement of Curie temperature of barium hexaferrite by dense electronic excitations

Journal Article · Tue Jul 15 00:00:00 EDT 2014 · AIP Advances

DOI:https://doi.org/10.1063/1.4891647· OSTI ID:22299782

Sharma, Manju; Kashyap, Subhash C.; Gupta, Hem C. ^[1]; Dimri, Mukesh C. ^[2]; Asokan, K. ^[3]

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1. Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016 (India)
2. Ajay Kumar Garg Engineering College, Ghaziabad - 201009 (India)
3. Materials Science Group, Inter University Accelerator Center, New Delhi-110067 (India)

Curie temperature of polycrystalline barium hexaferrite (BaFe{sub 12}O{sub 19}), prepared by conventional solid state technique, is anomalously and significantly enhanced (by nearly 15%) by energetic heavy ion irradiation (150 MeV, Ag{sup 12+}) at ambient temperature due to dense electronic excitations Moderate fluence (1 × 10{sup 12} ions/cm{sup 2}) induces structural defects giving rise to above enhancement. As established by X-ray diffraction, scanning electron microscopy and Raman studies, higher fluence (1 × 10{sup 13} ions/cm{sup 2}) has structurally transformed the sample to amorphous phase with marginal change in magnetization and Curie temperature.

• OSTI ID: 22299782
• Journal Information: AIP Advances, Vol. 4, Issue 7; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2158-3226
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMBIENT TEMPERATURE
CURIE POINT
EXCITATION
FERRITES
HEAVY IONS
IRRADIATION
MAGNETIZATION
POLYCRYSTALS
SCANNING ELECTRON MICROSCOPY
SOLIDS
X-RAY DIFFRACTION