High Figure of Merit Magneto Optics from Interfacial Skyrmions on Topological Insulators
| Autor: | Amrit De, Roger K. Lake, Tonmoy Bhowmick |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Physics
Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Band gap Texture (cosmology) Skyrmion Fermi level FOS: Physical sciences Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences symbols.namesake Condensed Matter::Materials Science Topological insulator Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences symbols Figure of merit 010306 general physics 0210 nano-technology Magneto Phase diagram |
| Popis: | In the Kerr rotation geometry, magneto-optic memory devices typically suffer from low figure-of-merit (FOM) and long write times. We show that skyrmions formed at the interface of a thin-film multiferroic and a topological insulator can give rise to high FOM magneto-optic Kerr effects (MOKEs). Huge differential MOKE can arise in parts of the phase diagram. Resonancelike features in the MOKE spectra arising from the induced low energy TI band gap, the multiferroic-film thickness, and the high energy Drude-like behavior are resolved and explained. The Fermi level dependence of the MOKE signatures is distinct for the different magnetic textures. This has broad implications for magnetic texture characterization, electro-optic modulators and isolators, and high density magnetic optic memory. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|