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Title: Enhancement of Curie temperature of barium hexaferrite by dense electronic excitations

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.
Authors:
; ;  [1] ;  [2] ;  [3]
  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)
Publication Date:
OSTI Identifier:
22299782
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 4; Journal Issue: 7; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AMBIENT TEMPERATURE; CURIE POINT; EXCITATION; FERRITES; HEAVY IONS; IRRADIATION; MAGNETIZATION; POLYCRYSTALS; SCANNING ELECTRON MICROSCOPY; SOLIDS; X-RAY DIFFRACTION