Linear magnetoresistance (LMR) is of particular interest for memory, electronics, and sensing applications, especially when it does not saturate over a wide range of magnetic fields. One of its principal origins is local mobility or density inhomogeneities, often structural, which in the Parish-Littlewood theory leads to an unsaturating LMR proportional to mobility. Structural disorder, however, also tends to limit the mobility and hence the overall LMR amplitude. An alternative route to achieve large LMR is via non-structural inhomogeneities which do not affect the zero field mobility, like magnetic domains. Here, linear positive magnetoresistance caused by magnetic texture is reported in \ch{LaTiO3}/\ch{SrTiO3} heterostructures. The LMR amplitude reaches up to 6500\% at 9T. This colossal value is understood by the unusual combination of a very high thin film mobility, up to 40 000 cm2/V.s, and a very large coverage of low-mobility regions. These regions correlate with a striped magnetic structure, compatible with a spiral magnetic texture in the \ch{LaTiO3} film, revealed by low temperature Lorentz transmission electron microscopy. These results provide a novel route for the engineering of large-LMR devices.
@article{arxiv.2210.07682,
title = {Linear colossal magnetoresistance driven by magnetic textures in LaTiO3 thin films on SrTiO3},
author = {Teresa Tschirner and Berengar Leikert and Felix Kern and Daniel Wolf and Axel Lubk and Martin Kamp and Kirill Miller and Fabian Hartmann and Sven Höfling and Bernd Büchner and Joseph Dufouleur and Marc Gabay and Michael Sing and Ralph Claessen and Louis Veyrat},
journal= {arXiv preprint arXiv:2210.07682},
year = {2024}
}