Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 1: Topological Insulators 1 (joint session TT/HL)

TT 1.10: Vortrag

Montag, 16. März 2020, 12:00–12:15, HSZ 03

Topological insulator interfaced with ferromagnetic insulators: Bi2Te3 thin films on magnetite and iron garnetsV. M. Pereira1, S. G. Altendorf1, C. E. Liu1, S. C. Liao1, A. C. Komarek1, M. Guo2, H. -J. Lin3, C. T. Chen3, M. Hong4, J. Kwo2, L. H. Tjeng1, and •C. N. Wu1,21MPI CPfS, Dresden, Germany — 2Dept. of Phys., NTHU, Hsinchu, Taiwan — 3NSRRC, Hsinchu, Taiwan — 4Dept. of Phys., NTU, Taipei, Taiwan

We report on our study about the growth and characterization of Bi2Te3 thin films on top of Y3Fe5O12(111), Tm3Fe5O12(111), Fe3O4(111), and Fe3O4(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 M45 edges. The results suggest that the ferromagnetism induced by the magnetic proximity effect via Van der Waals bonding in Bi2Te3 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.

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