Stroboscopic Kerr imaging of magnetoacoustic waves in ferromagnetic thin films
In this work, we develop a Stroboscopic Kerr Microscope capable of visualizing both surface acoustic waves (SAWs) and magnetoacoustic waves (MAWs). The setup combines the magnetic contrast sensitivity of MOKE microscopy with the temporal resolution of stroboscopic imaging, as well as uniform illumin...
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| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/452402 |
| Acceso en línea: | https://hdl.handle.net/2117/452402 |
| Access Level: | acceso abierto |
| Palabra clave: | Acoustic surface waves Microscopy Magnetoacoustic waves Stroboscopic Kerr microscopy Magnetoelastic coupling Surface acoustic waves Ferromagnetic thin films Spintronics Ones acústiques de superfície Microscòpia Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica::Fotònica |
| Sumario: | In this work, we develop a Stroboscopic Kerr Microscope capable of visualizing both surface acoustic waves (SAWs) and magnetoacoustic waves (MAWs). The setup combines the magnetic contrast sensitivity of MOKE microscopy with the temporal resolution of stroboscopic imaging, as well as uniform illumination achieved through a multimode fiber and a despeckler. We obtained SAW images at 124, 248, and 371 MHz, and focused on MAW imaging at 124 MHz, in stripe widths of 200 µm. Furthermore, the flexibility of the system allows us to quantify the magnetization tilt amplitude under a magnetic field sweep and to study its angular dependence. Tilt amplitudes of up to 30% of full switching are observed in the nickel layer. |
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