Vpliv kovinsko-organskega stika na magnetno anizotropijo tankih filmov kobalta

Strohsack, Jaka (author), Mertelj, Tomaž (mentor)

Z ultrahitro časovno ločljivo optično spektroskopijo smo raziskovali vpliv stika kobalta z različnimi organskimi molekulskimi polprevodniki na magnetno anizotropijo v tankih filmih kobalta. Poleg vpliva molekul smo za primerjavo raziskovali tudi vpliv površinske oksidacije kobalta. Med vzorci z različnimi molekulami različnih oblik nismo opazili velikih razlik v obnašanju. Ugotovili smo, da so molekule povzročile močno povečanje magnetne anizotropije v ravnini filmov pod temperaturo $\sim$170 K. Prav tako se je povečala njena nehomogenost. V vzorcu s kobaltovim oksidom smo pod temperaturo $\sim$100 K prav tako opazili povečanje ravninske magnetne anizotropije, ki pa je bilo manjše kot v vzorcih z molekulami.

• Language: Slovenian
• Keywords: ultrahitra časovno ločjiva optična spektroskopija, tanki filmi kobalta, magnetna anizotropija, spinski stik, organski polprevodniki
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FMF - Faculty of Mathematics and Physics
• Year: 2023
• PID: 20.500.12556/RUL-150135
• COBISS.SI-ID: 164348931
• Publication date in RUL: 14.09.2023

Secondary language

• Language: English
• Title: Influence of metal-organic interface on the magnetic anisotropy in Co thin films

Abstract

By means of the ultrafast time-resolved optical spectroscopy we investigated the effect of different organic molecular semiconductors on the magnetic anisotropy of cobalt thin films as a consequence of forming a ferromagnetic-metal/organic-semiconductor spinterface. In addition to the molecules, the effect of natural cobalt surface oxidation was also investigated for comparison. We did not find large differences in the behavior of the samples containing molecules of different geometries. The molecules were found to significantly increase the in-plane magnetic anisotropy of the films below the temperature of $\sim$170 K. Additionally, the magnetic anisotropy inhomogeneity increased. The in-plane magnetic anisotropy also increased in the naturally oxidized sample below the temperature of $\sim$100 K. The increase was much smaller then in samples with organic molecules.

• Keywords: ultrafast time-resolved optical spectroscopy, cobalt thin films, magnetic anisotropy, spinterface, organic semiconductors