SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Poster Magnetism I

MA 23.55: Poster

Dienstag, 28. März 2023, 17:00–19:00, P1

THz emission from Ni/NiO/Pt and Co/CoO/Pt multilayers — •Nikos Kanistras¹, Laura Scheuer², Dimitrios Anyfantis³, Panagiotis Poulopoulos³, and Evangelos Th. Papaioannou¹ — ¹Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06120 Halle, Germany — ²Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663, Kaiserslautern, Germany — ³Department of Materials Science, School of Natural Sciences University of Patras, Rio, 26504 Patras, Greece

Ultrafast spin-to-charge conversion in heterostructures composed of ferromagnetic (FM)/non-magnetic(NM) thin films can give rise to the emission of THz electromagnetic waves[1]. In this work we investigate the role of an antiferromagnetic oxide interlayer like NiO and CoO in the THz emission. The trilayers are grown with the sputtering technique. The samples exhibit in plane magnetic easy axis as revealed by magneto-optical and Squid magnetometry. The presence of very thin NiO and CoO allows the spin transport from the ferromagnetic to the Pt layer and lead to the THz emission. However, there is a reduction on the signal which is discussed in conjunction of the structural and magnetic properties of the antiferromagnetic layers. [1]E. Papaioannou, R. Beigang Nanophotonics10, 1243*1257 (2021).