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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2505.10313 |
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| _version_ | 1866913839914680320 |
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| author | Bassi, Nicolò Wilhelm, Jan Krane, Nils Xiang, Feifei Čmelová, Patrícia Turco, Elia Gargiani, Pierluigi Pignedoli, Carlo Juríček, Michal Fasel, Roman ár, Richard Koryt Ruffieux, Pascal . |
| author_facet | Bassi, Nicolò Wilhelm, Jan Krane, Nils Xiang, Feifei Čmelová, Patrícia Turco, Elia Gargiani, Pierluigi Pignedoli, Carlo Juríček, Michal Fasel, Roman ár, Richard Koryt Ruffieux, Pascal . |
| contents | Open-shell nanographenes have attracted significant attention due to their structurally tunable spin ground state. While most characterization has been conducted on weakly-interacting substrates such as noble metals, the influence of magnetic surfaces remains largely unexplored. In this study, we investigate how TbAu2, a rare-earth-element-based surface alloy, affects the magnetic properties of phenalenyl (or [2]triangulene (2T)), the smallest spin-1/2 nanographene. Scanning tunneling spectroscopy (STS) measurements reveal a striking contrast: while 2T on Au(111) exhibits a zero-bias Kondo resonance - a hallmark of a spin-1/2 impurity screened by the conduction electrons of the underlying metal - deposition on TbAu2 induces a symmetric splitting of this feature by approximately 20 mV. We attribute this splitting to a strong proximity-induced interaction with the ferromagnetic out-of-plane magnetization of TbAu2. Moreover, our combined experimental and first-principles analysis demonstrates that this interaction is spatially modulated, following the periodicity of the TbAu2 surface superstructure. These findings highlight that TbAu2 serves as a viable platform for stabilizing and probing the magnetic properties of spin-1/2 nanographenes, opening new avenues for the integration of π-magnetic materials with magnetic substrates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_10313 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Sensing a magnetic rare-earth surface alloy by proximity effect with an open-shell nanographene Bassi, Nicolò Wilhelm, Jan Krane, Nils Xiang, Feifei Čmelová, Patrícia Turco, Elia Gargiani, Pierluigi Pignedoli, Carlo Juríček, Michal Fasel, Roman ár, Richard Koryt Ruffieux, Pascal . Materials Science Mesoscale and Nanoscale Physics Open-shell nanographenes have attracted significant attention due to their structurally tunable spin ground state. While most characterization has been conducted on weakly-interacting substrates such as noble metals, the influence of magnetic surfaces remains largely unexplored. In this study, we investigate how TbAu2, a rare-earth-element-based surface alloy, affects the magnetic properties of phenalenyl (or [2]triangulene (2T)), the smallest spin-1/2 nanographene. Scanning tunneling spectroscopy (STS) measurements reveal a striking contrast: while 2T on Au(111) exhibits a zero-bias Kondo resonance - a hallmark of a spin-1/2 impurity screened by the conduction electrons of the underlying metal - deposition on TbAu2 induces a symmetric splitting of this feature by approximately 20 mV. We attribute this splitting to a strong proximity-induced interaction with the ferromagnetic out-of-plane magnetization of TbAu2. Moreover, our combined experimental and first-principles analysis demonstrates that this interaction is spatially modulated, following the periodicity of the TbAu2 surface superstructure. These findings highlight that TbAu2 serves as a viable platform for stabilizing and probing the magnetic properties of spin-1/2 nanographenes, opening new avenues for the integration of π-magnetic materials with magnetic substrates. |
| title | Sensing a magnetic rare-earth surface alloy by proximity effect with an open-shell nanographene |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2505.10313 |