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Magnetic force microscopy studies on the magnetic ordering in organic materials induced by high-energy proton irradiation |
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| Authors: | D Spemann K Schindler P Esquinazi M Diaconu H Schmidt R Hhne A Setzer T Butz |
| Affiliation: | aNuclear Solid State Physics, University of Leipzig, Linnéstr. 5, D-04103 Leipzig, Germany bSuperconductivity and Magnetism, University of Leipzig, Linnéstr. 5, D-04103 Leipzig, Germany cSemiconductor Physics, University of Leipzig, Linnéstr. 5, D-04103 Leipzig, Germany |
| Abstract: | In this study, ferromagnetic microstructures in highly oriented pyrolytic graphite and superparamagnetic spots in polyimide foils were created by 2.25 MeV proton microbeam irradiation and characterized using atomic and magnetic force microscopy. For this purpose, graphite samples were irradiated with cross-like patterns of 15 μm × 15 μm size using ion fluences in the range of (0.003–2.5) × 1018 cm?2. The irradiated crosses showed strong magnetic signals and a complex domain structure in the magnetic images depending on the geometrical dimensions of the crosses. Furthermore, polyimide foils were irradiated with microspots and fluences in the range of (0.016–3.1) × 1019 cm?2. Magnetic force microscopy shows very strong phase shifts in these irradiated areas. |
| Keywords: | Magnetism Carbon Polyimide Ion microbeam Irradiation Defects |
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