We report an experimental study that focuses on the magneto-optic interaction between light and p... more We report an experimental study that focuses on the magneto-optic interaction between light and perpendicularly magnetized ferromagnetic thin-film multilayers. In this study, samples containing multiple Co/Pt interfaces are measured via the polar magneto-optic Kerr effect. Thanks to a sample set with a continuous Co thickness variation and single and double Co-layered samples, interface and bulk contributions to the magneto-optic activity are separately determined. Kerr rotation and ellipticity signals are recorded as a function of the Co thickness. The results are analyzed via a transfer matrix method that accounts for the standard optical and magneto-optic effects in multi-layered thin-films. Bulk magneto-optic contribution of Co ( Q Co , bulk) that is in accordance with the literature is consistently determined despite the use of thin-films. Interfacial Co ( Q Co , int .) and magnetized Pt ( Q Pt) contributions are presented in terms of two models. Interface phenomena of the larg...
Inspired by the theoretical work suggesting a simple method to predict the charge transfer betwee... more Inspired by the theoretical work suggesting a simple method to predict the charge transfer between any chosen transition metal oxide (TMO) at their interface, this study provided experimental evidence on the charge transfer between TMO pairs of SrVO3/SrNbO3 and LaTiO3/LaMnO3. XPS core level spectra of the transition metal sites are utilized to monitor the valence changes of the transition metal sites. Valence state information gathered from the bulk and the interface sites, are compared to draw conclusions on the charge transfer at the interfaces. Due to compounds SrVO3 and SrNbO3 containing highly degenerate energy levels, XPS spectrum interpretation became challenging. By using final-state effects to explain the multi-peak structure appearance in XPS core level spectra of Nb and V, meaningful results on the charge transfer are gathered. Nb ion sites demonstrated a shift from Nb+4 towards Nb+5 at the interface states, suggesting charge transfer from SrNbO3 layer to SrVO3 layer. For...
We report an experimental study that focuses on the magneto-optic interaction between light and p... more We report an experimental study that focuses on the magneto-optic interaction between light and perpendicularly magnetized ferromagnetic thin-film multilayers. In this study, samples containing multiple Co/Pt interfaces are measured via the polar magneto-optic Kerr effect. Thanks to a sample set with a continuous Co thickness variation and single and double Co-layered samples, interface and bulk contributions to the magneto-optic activity are separately determined. Kerr rotation and ellipticity signals are recorded as a function of the Co thickness. The results are analyzed via a transfer matrix method that accounts for the standard optical and magneto-optic effects in multi-layered thin-films. Bulk magneto-optic contribution of Co ( Q Co , bulk) that is in accordance with the literature is consistently determined despite the use of thin-films. Interfacial Co ( Q Co , int .) and magnetized Pt ( Q Pt) contributions are presented in terms of two models. Interface phenomena of the larg...
Inspired by the theoretical work suggesting a simple method to predict the charge transfer betwee... more Inspired by the theoretical work suggesting a simple method to predict the charge transfer between any chosen transition metal oxide (TMO) at their interface, this study provided experimental evidence on the charge transfer between TMO pairs of SrVO3/SrNbO3 and LaTiO3/LaMnO3. XPS core level spectra of the transition metal sites are utilized to monitor the valence changes of the transition metal sites. Valence state information gathered from the bulk and the interface sites, are compared to draw conclusions on the charge transfer at the interfaces. Due to compounds SrVO3 and SrNbO3 containing highly degenerate energy levels, XPS spectrum interpretation became challenging. By using final-state effects to explain the multi-peak structure appearance in XPS core level spectra of Nb and V, meaningful results on the charge transfer are gathered. Nb ion sites demonstrated a shift from Nb+4 towards Nb+5 at the interface states, suggesting charge transfer from SrNbO3 layer to SrVO3 layer. For...
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Papers by Ece Demirer