Effect of swift heavy ion irradiation in FePt system

✍ Scribed by S. Kavita; V. Raghavendra Reddy; Ajay Gupta; D.K. Avasthi

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 163 KB
• Volume: 244
• Category: Article
• ISSN: 0168-583X
• DOI: 10.1016/j.nimb.2005.11.069

✦ Synopsis

The present study reports the effects of swift heavy ion irradiation in FePt system in different forms viz., uniform alloy film, multilayer, and nano-particles in non-magnetic medium. The FePt alloy film, Fe/Pt multilayer and FePt nano-particles in silver matrix with partial L1 0 ordering, are prepared by ion beam sputtering method and subsequent vacuum annealing at 450 °C for 1 h. These samples are irradiated with swift heavy ions in order to study structural changes induced due to electronic energy loss by the bombarding ions. X-ray diffraction and magneto-optical Kerr effect are used for the characterisation of the unirradiated and irradiated films. It is observed that irradiation results in partial destruction of L1 0 ordering. Irradiation effects are more pronounced in the case of nano-particles and multilayers as compared to that of continuous alloy film. The results are discussed using thermal spike model.