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Journal of Magnetism and Magnetic Materials 324 (2012) 2136-2141
Defects induced magnetic transition in Co doped ZnS thin films: Effects of swift heavy ion irradiations
S. P. Patel, J.C. Pivin1, M.K Patel, J. Won, R. Chandra, D. Kanjilal, L. Kumar

The effect of swift heavy ions (SHI) on magnetic ordering in ZnS thin films with Co ions substituted on Zn sites is investigated. The materials have been synthesized by pulsed laser deposition on substrates held at 600 °C for obtaining films with wurtzite crystal structure and it showed ferromagnetic ordering up to room temperature with a paramagnetic component. 120 MeV Ag ions have been used at different fluences of 1×1011 ions/cm2 and 1×1012 ions/cm2 for SHI induced modifications. The long range correlation between paramagnetic spins on Co ions was destroyed by irradiation and the material became purely paramagnetic. The effect is ascribed to the formation of cylindrical ion tracks due to the thermal spikes resulting from electron-phonon coupling.
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Physique/Matière Condensée/Science des matériaux

Sciences de l'ingénieur/Matériaux
DMS – SHI irradiation – SQUID – Ion track – Defect