Strong uniaxial magnetic anisotropy in Co films on highly ordered grating-like nanopatterned Ge surfaces
| Autor: | Safiul Alam Mollick, Mohit Kumar, Satyaranjan Bhattacharyya, Tapobrata Som, Ranveer Singh |
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| Rok vydání: | 2018 |
| Předmět: |
Kerr effect
Materials science Condensed matter physics Mechanical Engineering Physics::Optics Bioengineering 02 engineering and technology General Chemistry Grating 021001 nanoscience & nanotechnology 01 natural sciences Magnetic field Condensed Matter::Materials Science Magnetic anisotropy Domain wall (magnetism) Mechanics of Materials 0103 physical sciences General Materials Science Electrical and Electronic Engineering Thin film Magnetic force microscope 010306 general physics 0210 nano-technology Anisotropy |
| Zdroj: | Nanotechnology. 29(12) |
| ISSN: | 1361-6528 |
| Popis: | We present a systematic investigation on uniaxial magnetic anisotropy (UMA) in Co thin films induced by high aspect ratio nanopatterned anisotropic substrates. Self-organized long grating-like nanostructures, with extreme regularities, are fabricated on Ge surfaces using Au-ion implantation at room temperature. Subsequently deposition of Co films are carried out on the same at two different angles. Magneto-optical Kerr effect measurements show strong UMA in Co films grown on ion-patterned Ge substrates, fabricated under different ion fluences, along and perpendicular to the direction of the patterns (long grating-like nanostructures). Magnetic force microscopy measurements under different externally applied magnetic fields reveal an easy domain wall motion when the field is applied along the grating-like nanostructures. On the other hand, high amplitude grating-like nanostructures hinder the spin rotation when the field is applied along the hard axis. The present study will be useful for magnetic recording media and ultra-small magnetic field sensors. |
| Databáze: | OpenAIRE |
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