Image-potential states on a 2D Gr-ferromagnet hybrid: enhancing spin and stacking sensing
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arXiv
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| Natura: | Preprint |
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2025
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| _version_ | 1866912472547459072 |
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| author | Bazarnik, Maciej Schlenhoff, Anika |
| author_facet | Bazarnik, Maciej Schlenhoff, Anika |
| contents | Spin-resolved scanning tunneling microscopy and spectroscopy studies of image-potential states on Gr/Fe/Ir(111) show their sensitivity to the spatial variation of the Gr-Fe distance, and of the interfacial charge and spin transfer within the moiré unit cell. A stacking contrast between fcc and hcp sites, indistinguishable in the direct tunneling mode, is provided by the image-potential states in both resonant tunneling topography and spectroscopy images. The spin-polarized measurements reveal a site- and energy-dependent spin-polarization of the image-potential states that is mapped across the moiré unit cell with a spin contrast between hcp and fcc sites unobservable in direct tunneling mode. On the on-top sites, the lowest image-potential states are found to exhibit a high spin-polarization, in contrast to the electronic states around the Fermi energy evanescent into vacuum, and attributed to their interfacial character at the respective Gr-Fe distance. Since the physisorbed graphene is only weakly spin-polarized on these sites, image-potential states reflect the spin density at buried interfaces covered by non-magnetic passivation layers. The simultaneous imaging of structural, electronic and magnetic properties, both at the surface and the buried interface will prove invaluable in research of 2D hybrids and heterostructures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_08413 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Image-potential states on a 2D Gr-ferromagnet hybrid: enhancing spin and stacking sensing Bazarnik, Maciej Schlenhoff, Anika Mesoscale and Nanoscale Physics Materials Science Spin-resolved scanning tunneling microscopy and spectroscopy studies of image-potential states on Gr/Fe/Ir(111) show their sensitivity to the spatial variation of the Gr-Fe distance, and of the interfacial charge and spin transfer within the moiré unit cell. A stacking contrast between fcc and hcp sites, indistinguishable in the direct tunneling mode, is provided by the image-potential states in both resonant tunneling topography and spectroscopy images. The spin-polarized measurements reveal a site- and energy-dependent spin-polarization of the image-potential states that is mapped across the moiré unit cell with a spin contrast between hcp and fcc sites unobservable in direct tunneling mode. On the on-top sites, the lowest image-potential states are found to exhibit a high spin-polarization, in contrast to the electronic states around the Fermi energy evanescent into vacuum, and attributed to their interfacial character at the respective Gr-Fe distance. Since the physisorbed graphene is only weakly spin-polarized on these sites, image-potential states reflect the spin density at buried interfaces covered by non-magnetic passivation layers. The simultaneous imaging of structural, electronic and magnetic properties, both at the surface and the buried interface will prove invaluable in research of 2D hybrids and heterostructures. |
| title | Image-potential states on a 2D Gr-ferromagnet hybrid: enhancing spin and stacking sensing |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2503.08413 |