Strong spin-dephasing in a topological insulator-paramagnet heterostructure

Lapano, Jason; Mazza, Alessandro R.; Li, Haoxiang; Mukherjee, Debangshu; Skoropata, Elizabeth M.; Ok, Jong Mok; Miao, Hu; Moore, Robert G.; Ward, Thomas Z.; Eres, Gyula; Lee, Ho Nyung; Brahlek, Matthew

doi:10.1063/5.0011134

Strong spin-dephasing in a topological insulator-paramagnet heterostructure

Journal Article · Thu Sep 24 00:00:00 EDT 2020 · APL Materials

DOI:https://doi.org/10.1063/5.0011134· OSTI ID:1666004

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

The interface between magnetic materials and topological insulators can drive the formation of exotic phases of matter and enable functionality through the manipulation of the strong spin polarized transport. Here, we report that the transport processes that rely on strong spin-momentum locking in the topological insulator Bi₂Se₃ are completely suppressed by scattering at a heterointerface with the kagome-lattice paramagnet, Co₇Se₈. Bi₂Se₃–Co₇Se₈–Bi₂Se₃ trilayer heterostructures were grown using molecular beam epitaxy, where magnetotransport measurements revealed a substantial suppression of the weak antilocalization effect for Co₇Se₈ at thicknesses as thin as a monolayer, indicating a strong dephasing mechanism. Bi_2-xCo_xSe₃ films, in which Co is in a non-magnetic 3⁺ state, show weak antilocalization that survives to higher than x = 0.4, which, in comparison with the heterostructures, suggests that the unordered moments of Co²⁺ act as a far stronger dephasing element. This work highlights several important points regarding coherent transport processes involving spin-momentum locking in topological insulator interfaces and how magnetic materials can be integrated with topological materials to realize both exotic phases and novel device functionality.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1666004

Journal Information:: APL Materials, Journal Name: APL Materials Journal Issue: 9 Vol. 8; ISSN 2166-532X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Focused ion beam
Kagome lattices
crystal lattices
electronic transport
epitaxy
heterostructures
magnetic fields
magnetic materials
topological insulator
x-ray diffraction

Strong spin-dephasing in a topological insulator-paramagnet heterostructure

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