SKM 2023 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 6: Poster

KFM 6.27: Poster

Dienstag, 28. März 2023, 17:00–19:00, P3

Local control of ferromagnetic domain patterns via structural ordering — •Ahmed Samir Lotfy, Lukas Kuerten, Yooun Heo, Elzbieta Gradauskaite, Morgan Trassin, and Manfred Fiebig — Department of materials, ETH Zürich, Zürich, Switzerland

Controlling domain patterns is closely linked to device functionalities in logic applications. However, the means to engineer domain locations are scarce so far, limiting this functionality. The recent utilization of substrate topography to predefine the ferroelectric domain patterns by engineering the substrate step spacing via different miscut angles motivates our investigation for a similar control mechanism over ferromagnetic domain patterns. Neodymium gallate (NGO) is our substrate of choice because it is the only oxide among the lanthanide gallates with no structural phase transitions in a very extended temperature range (12-1773K). Therefore, La0.7Sr0.3MnO3 (LSMO) films grown on NGO substrates exhibiting substrate steps were also investigated for such a correlation between the substrate topography and the ferromagnetic domain patterns in LSMO. Strikingly our results show an identical domain pattern to the substrate steps. This correlation might result from the ferroelastic nature of LSMO and could be utilized for ultrahigh-density memory devices.