Effect of swift heavy ion irradiation in W/Co multilayer structures |
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Authors: | Sharmistha Bagchi Shahid Anwar |
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Affiliation: | a UGC-DAE Consortiums for Scientific Research, Indore, India b Central Electro Chemical Research Institute (CECRI-CSIR), Karaikudi, India c Institute of Minerals and Materials Technology (IMMT-CSIR), Bhubaneswar, India |
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Abstract: | Present study reports effect of swift heavy ion irradiation on structural and magnetic properties of sputtered W/Co multilayer structures (MLS) having bilayer compositions of [W(10 Å)/Co(20 Å)]5BL and [W(20 Å)/Co(20 Å)]5BL. These MLS are irradiated by 120 MeV Au9+ ions up to fluence of 1 × 1013 ions/cm2. X-ray reflectivity (XRR), wide-angle X-ray diffraction (WAXD), cross-sectional transmission electron microscopy (X-TEM) and magneto optical Kerr effect (MOKE) techniques are used for structural and magnetic characterization of pristine and irradiated MLS. Analysis of XRR data using Parratt’s formalism shows a significant increase in W/Co interface roughness. WAXD and X-TEM studies reveals that intra-layer microstructure of Co-layers in MLS becomes nano-crystalline on irradiation. MOKE study shows slight increase in coercivity at higher fluence, which may be due to increase in surface and interface roughness after recrystallization of Co-layers. |
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Keywords: | W/Co Multilayers Cross-sectional TEM Microstructure |
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