Topological insulator interfaced with ferromagnetic insulators: Bi2Te3 thin films on magnetite and iron garnets
| Autor: | Mengxin Guo, S. G. Altendorf, Sheng-Chieh Liao, Alexander C. Komarek, C. N. Wu, V. M. Pereira, Chien-Te Chen, Chang Liu, J. Kwo, Hong-Ji Lin, Minghwei Hong, Liu Hao Tjeng |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Magnetoresistance Magnetic circular dichroism 02 engineering and technology 021001 nanoscience & nanotechnology Epitaxy 01 natural sciences Condensed Matter::Materials Science symbols.namesake Crystallography Ferromagnetism Hall effect Topological insulator 0103 physical sciences symbols Proximity effect (superconductivity) General Materials Science van der Waals force 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review Materials. 4 |
| ISSN: | 2475-9953 |
| DOI: | 10.1103/physrevmaterials.4.064202 |
| Popis: | We report our study about the growth and characterization of $\mathrm{B}{\mathrm{i}}_{2}\mathrm{T}{\mathrm{e}}_{3}$ thin films on top of ${\mathrm{Y}}_{3}\mathrm{F}{\mathrm{e}}_{5}{\mathrm{O}}_{12}$(111), $\mathrm{T}{\mathrm{m}}_{3}\mathrm{F}{\mathrm{e}}_{5}{\mathrm{O}}_{12}$(111), $\mathrm{F}{\mathrm{e}}_{3}{\mathrm{O}}_{4}$(111), and $\mathrm{F}{\mathrm{e}}_{3}{\mathrm{O}}_{4}$(100) single-crystal substrates. Using molecular-beam epitaxy, we were able to prepare the topological insulator/ferromagnetic insulator heterostructures with no or minimal chemical reaction at the interface. We observed the anomalous Hall effect on these heterostructures and also a suppression of the weak antilocalization in the magnetoresistance, indicating a topological surface-state gap opening induced by the magnetic proximity effect. However, we did not observe any obvious x-ray magnetic circular dichroism (XMCD) on the Te ${M}_{45}$ edges. The results suggest that the ferromagnetism induced by the magnetic proximity effect via van der Waals bonding in $\mathrm{B}{\mathrm{i}}_{2}\mathrm{T}{\mathrm{e}}_{3}$ is too weak to be detected by XMCD, but still can be observed by electrical transport measurements. This is in fact not inconsistent with reported density-functional calculations on the size of the gap opening. |
| Databáze: | OpenAIRE |
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