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Defects induced magnetic transition in Co doped ZnS thin films: Effects of swift heavy ion irradiations |
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| Authors: | Shiv P Patel JC Pivin MK Patel Jonghan Won Ramesh Chandra D Kanjilal Lokendra Kumar |
| Institution: | 1. Physics Department, University of Allahabad, Allahabad 211002, India;2. CSNSM, IN2P3-CNRS, Batiment 108, F-91405 Orsay Campus, France;3. Materials Science and Technology Division, MST-8, P.O.Box 1663, Mail Stop G755, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;4. Nanoscience Laboratory, IIC, Indian Institute of Technology, Roorkee 247667, India;5. Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India |
| Abstract: | 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. |
| Keywords: | DMS SHI irradiation SQUID Ion track Defect |
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