The magneto-optical Kerr effect (MOKE) describes the change in polarization of light reflected from a magnetic surface. This change is proportional to the magnetization and depends on the wavelength of light. Because of these properties, MOKE has found use as a tool to probe magnetism in matter. The aim of the project is to develop an experimental setup to measure the wavelength dependence of MOKE. This is of interest as it can be used to determine the wavelength that gives the largest change in polarization to optimize measurements and provide information about the electronic structure of the sample. Initially, the experimental setup used a laser with tunable wavelength. However, it turned out to be pulsed, which made it incompatible with the rest of the setup. Therefore, three lasers with fixed wavelengths were instead used. The setup was evaluated by measuring the Kerr rotation and hysteresis curves for three Ni samples with varying thicknesses and a TbCo sample, at three different wavelengths. The primary finding was that the setup is not suitable for spectroscopic measurements due to the inability to compare values obtained at different wavelengths. To facilitate spectroscopic measurements, a new light source with tunable wavelength is required. The setup is capable of measuring hysteresis curves.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:uu-515222 |
| Date | January 2023 |
| Creators | Åberg, Sebastian |
| Publisher | Uppsala universitet, Materialfysik |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | UPTEC Q, 1401-5773 ; 23011 |
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