Imaging the suppression of ferromagnetism in LaMnO$_3$ by metallic overlayers
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866910453374910464 |
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| author | Folkers, Bart Jansen, Thies Roskamp, Thijs J. Reith, Pim Timmermans, André Jannis, Daen Gauquelin, Nicolas Verbeeck, Johan Hilgenkamp, Hans Rosário, Carlos M. M. |
| author_facet | Folkers, Bart Jansen, Thies Roskamp, Thijs J. Reith, Pim Timmermans, André Jannis, Daen Gauquelin, Nicolas Verbeeck, Johan Hilgenkamp, Hans Rosário, Carlos M. M. |
| contents | LaMnO$_3$ (LMO) thin films epitaxially grown on SrTiO$_3$ (STO) usually exhibit ferromagnetism above a critical layer thickness. We report the use of scanning SQUID microscopy (SSM) to study the suppression of the ferromagnetism in STO/LMO/metal structures. By partially covering the LMO surface with a metallic layer, both covered and uncovered LMO regions can be studied simultaneously. While Au does not significantly influence the ferromagnetic order of the underlying LMO film, a thin Ti layer induces a strong suppression of the ferromagnetism, over tens of nanometers, which increases with time on a timescale of days. Detailed EELS analysis of the Ti-LaMnO$_3$ interface reveals \textcolor{black}{the presence of Mn$^{2+}$ and} an evolution of the Ti valence state from Ti$^0$ to Ti$^{4+}$ over approximately 5 nanometers. Furthermore, we demonstrate that by patterning Ti/Au overlayers, we can locally suppress the ferromagnetism and define ferromagnetic structures down to sub-micrometer scales. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_05514 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Imaging the suppression of ferromagnetism in LaMnO$_3$ by metallic overlayers Folkers, Bart Jansen, Thies Roskamp, Thijs J. Reith, Pim Timmermans, André Jannis, Daen Gauquelin, Nicolas Verbeeck, Johan Hilgenkamp, Hans Rosário, Carlos M. M. Materials Science LaMnO$_3$ (LMO) thin films epitaxially grown on SrTiO$_3$ (STO) usually exhibit ferromagnetism above a critical layer thickness. We report the use of scanning SQUID microscopy (SSM) to study the suppression of the ferromagnetism in STO/LMO/metal structures. By partially covering the LMO surface with a metallic layer, both covered and uncovered LMO regions can be studied simultaneously. While Au does not significantly influence the ferromagnetic order of the underlying LMO film, a thin Ti layer induces a strong suppression of the ferromagnetism, over tens of nanometers, which increases with time on a timescale of days. Detailed EELS analysis of the Ti-LaMnO$_3$ interface reveals \textcolor{black}{the presence of Mn$^{2+}$ and} an evolution of the Ti valence state from Ti$^0$ to Ti$^{4+}$ over approximately 5 nanometers. Furthermore, we demonstrate that by patterning Ti/Au overlayers, we can locally suppress the ferromagnetism and define ferromagnetic structures down to sub-micrometer scales. |
| title | Imaging the suppression of ferromagnetism in LaMnO$_3$ by metallic overlayers |
| topic | Materials Science |
| url | https://arxiv.org/abs/2310.05514 |