Imaging the suppression of ferromagnetism in LaMnO\(_3\) by metallic overlayers
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...
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| creator | Folkers, Bart Jansen, Thies Roskamp, Thijs J Reith, Pim Timmermans, André Daen Jannis Gauquelin, Nicolas Verbeeck, Johan Hilgenkamp, Hans Rosário, Carlos M M |
| description | 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. |
| doi_str_mv | 10.48550/arxiv.2310.05514 |
| format | Article |
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| subjects | Epitaxial growth Ferromagnetic materials Superconducting quantum interference devices Thickness Thin films Titanium Valence |
| title | Imaging the suppression of ferromagnetism in LaMnO\(_3\) by metallic overlayers |
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