Magnetic profile of proximity-coupled (Dy,Bi)2Te3/(Cr,Sb)2Te3 topological insulator heterostructures
<p>Magnetic topological insulators (TIs) are an ideal playground for the study of novel quantum phenomena building on time-reversal symmetry broken topological surface states. By combining different magnetic TIs in a heterostructure, their magnetic and electronic properties can be precisely tu...
| Main Authors: | , , , , , , , , , |
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| Format: | Journal article |
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American Physical Society
2019
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| _version_ | 1826279561249161216 |
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| author | Duffy, L Steinke, N Burn, D Frisk, A Lari, L Kuerbanjiang, B Lazarov, V Van Der Laan, G Langridge, S Hesjedal, T |
| author_facet | Duffy, L Steinke, N Burn, D Frisk, A Lari, L Kuerbanjiang, B Lazarov, V Van Der Laan, G Langridge, S Hesjedal, T |
| author_sort | Duffy, L |
| collection | OXFORD |
| description | <p>Magnetic topological insulators (TIs) are an ideal playground for the study of novel quantum phenomena building on time-reversal symmetry broken topological surface states. By combining different magnetic TIs in a heterostructure, their magnetic and electronic properties can be precisely tuned. Recently, we have combined high-moment Dy:Bi<sub>2</sub>Te<sub>3</sub>with high transition temperature Cr:Sb<sub>2</sub>Te<sub>3</sub> in a superlattice, and found, using x-ray magnetic circular dichroism (XMCD), that long-range magnetic order can be introduced in the Dy:Bi<sub>2</sub>Te<sub>3</sub> layers. Accompanying first-principles calculations indicated that the origin of the long-range magnetic order is a strong antiferromagnetic coupling between Dy and Cr magnetic moments at the interface extending over several layers. However, based on XMCD alone, which is either averaging over the entire thin film stack or is surface sensitive, this coupling scenario could not be fully confirmed. Here we use polarized neutron reflectometry (PNR), which is ideally suited for the detailed study of superlattices, to retrieve the magnetization in a layer- and interface-resolved way. We find that the magnetization is, in contrast to similar recent studies, homogeneous throughout the individual layers, with no apparent interfacial effects. This finding demonstrates that heterostructure engineering is a powerful way of controlling the magnetic properties of entire layers, with the effects of coupling reaching beyond the interface region.</p> |
| first_indexed | 2024-03-07T00:00:34Z |
| format | Journal article |
| id | oxford-uuid:75ca530f-09cf-4f37-9ae2-887f4a0e45db |
| institution | University of Oxford |
| last_indexed | 2024-03-07T00:00:34Z |
| publishDate | 2019 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:75ca530f-09cf-4f37-9ae2-887f4a0e45db2022-03-26T20:11:44ZMagnetic profile of proximity-coupled (Dy,Bi)2Te3/(Cr,Sb)2Te3 topological insulator heterostructuresJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:75ca530f-09cf-4f37-9ae2-887f4a0e45dbSymplectic Elements at OxfordAmerican Physical Society2019Duffy, LSteinke, NBurn, DFrisk, ALari, LKuerbanjiang, BLazarov, VVan Der Laan, GLangridge, SHesjedal, T<p>Magnetic topological insulators (TIs) are an ideal playground for the study of novel quantum phenomena building on time-reversal symmetry broken topological surface states. By combining different magnetic TIs in a heterostructure, their magnetic and electronic properties can be precisely tuned. Recently, we have combined high-moment Dy:Bi<sub>2</sub>Te<sub>3</sub>with high transition temperature Cr:Sb<sub>2</sub>Te<sub>3</sub> in a superlattice, and found, using x-ray magnetic circular dichroism (XMCD), that long-range magnetic order can be introduced in the Dy:Bi<sub>2</sub>Te<sub>3</sub> layers. Accompanying first-principles calculations indicated that the origin of the long-range magnetic order is a strong antiferromagnetic coupling between Dy and Cr magnetic moments at the interface extending over several layers. However, based on XMCD alone, which is either averaging over the entire thin film stack or is surface sensitive, this coupling scenario could not be fully confirmed. Here we use polarized neutron reflectometry (PNR), which is ideally suited for the detailed study of superlattices, to retrieve the magnetization in a layer- and interface-resolved way. We find that the magnetization is, in contrast to similar recent studies, homogeneous throughout the individual layers, with no apparent interfacial effects. This finding demonstrates that heterostructure engineering is a powerful way of controlling the magnetic properties of entire layers, with the effects of coupling reaching beyond the interface region.</p> |
| spellingShingle | Duffy, L Steinke, N Burn, D Frisk, A Lari, L Kuerbanjiang, B Lazarov, V Van Der Laan, G Langridge, S Hesjedal, T Magnetic profile of proximity-coupled (Dy,Bi)2Te3/(Cr,Sb)2Te3 topological insulator heterostructures |
| title | Magnetic profile of proximity-coupled (Dy,Bi)2Te3/(Cr,Sb)2Te3 topological insulator heterostructures |
| title_full | Magnetic profile of proximity-coupled (Dy,Bi)2Te3/(Cr,Sb)2Te3 topological insulator heterostructures |
| title_fullStr | Magnetic profile of proximity-coupled (Dy,Bi)2Te3/(Cr,Sb)2Te3 topological insulator heterostructures |
| title_full_unstemmed | Magnetic profile of proximity-coupled (Dy,Bi)2Te3/(Cr,Sb)2Te3 topological insulator heterostructures |
| title_short | Magnetic profile of proximity-coupled (Dy,Bi)2Te3/(Cr,Sb)2Te3 topological insulator heterostructures |
| title_sort | magnetic profile of proximity coupled dy bi 2te3 cr sb 2te3 topological insulator heterostructures |
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