Optically detected magnetic resonance spectroscopic analyses on the role of magnetic ions in colloidal nanocrystals

Incorporating magnetic ions into semiconductor nanocrystals has emerged as a prominent research field for manipulating spin-related properties. The magnetic ions within the host semiconductor experience spin-exchange interactions with photogenerated carriers and are often involved in the recombination routes, stimulating special magneto-optical effects. The current account presents a comparative study, emphasizing the impact of engineering nanostructures and selecting magnetic ions in shaping carrier-magnetic ion interactions. Various host materials, including the II-VI group, halide perovskites, and I-III-VI2 in diverse structural configurations such as core/shell quantum dots, seeded nanorods, and nanoplatelets, incorporated with magnetic ions such as Mn2+, Ni2+, and Cu1+/2+ are highlighted. These materials have recently been investigated by us using state-of-the-art steady-state and transient optically detected magnetic resonance (ODMR) spectroscopy to explore individual spin-dynamics between the photogenerated carriers and magnetic ions and their dependence on morphology, location, crystal composition, and type of the magnetic ion. The information extracted from the analyses of the ODMR spectra in those studies exposes fundamental physical parameters, such as g-factors, exchange coupling constants, and hyperfine interactions, together providing insights into the nature of the carrier (electron, hole, dopant), its local surroundings (isotropic/anisotropic), and spin dynamics. The findings illuminate the importance of ODMR spectroscopy in advancing our understanding of the role of magnetic ions in semiconductor nanocrystals and offer valuable knowledge for designing magnetic materials intended for various spin-related technologies

Das poietische Subjekt: Giambattista Vicos Wissenschaft vom Singulären

Giambattista Vicos Philosophie des mondo civile als Beispiel einer subjektkritischen Aufklärung. Als in der zweiten Hälfte des 20. Jahrhunderts der "Tod des Subjekts" verkündet wurde, geschah dies in Abhebung vom autonomen Subjekt der Aufklärung. Das Subjekt sei nicht autonom, hieß es, sondern vielmehr durch das Unbewusste, durch eine symbolische Ordnung oder durch die kapitalistischen Produktionsverhältnisse in seinen Handlungen bestimmt. Die vorliegende Studie zeigt am Beispiel Giambattista Vicos, dass das Subjekt schon in der Zeit der Aufklärung wesentlich differenzierter gedacht wurde, als es das postmoderne Feindbild wollte

Das poietische Subjekt: Giambattista Vicos Wissenschaft vom Singulären

Giambattista Vicos Philosophie des mondo civile als Beispiel einer subjektkritischen Aufklärung. Als in der zweiten Hälfte des 20. Jahrhunderts der "Tod des Subjekts" verkündet wurde, geschah dies in Abhebung vom autonomen Subjekt der Aufklärung. Das Subjekt sei nicht autonom, hieß es, sondern vielmehr durch das Unbewusste, durch eine symbolische Ordnung oder durch die kapitalistischen Produktionsverhältnisse in seinen Handlungen bestimmt. Die vorliegende Studie zeigt am Beispiel Giambattista Vicos, dass das Subjekt schon in der Zeit der Aufklärung wesentlich differenzierter gedacht wurde, als es das postmoderne Feindbild wollt

Optically detected magnetic resonance spectroscopic analyses on the role of magnetic ions in colloidal nanocrystals

Incorporating magnetic ions into semiconductor nanocrystals has emerged as a prominent research field for manipulating spin-related properties. The magnetic ions within the host semiconductor experience spin-exchange interactions with photogenerated carriers and are often involved in the recombination routes, stimulating special magneto-optical effects. The current account presents a comparative study, emphasizing the impact of engineering nanostructures and selecting magnetic ions in shaping carrier-magnetic ion interactions. Various host materials, including the II-VI group, halide perovskites, and I-III-VI2 in diverse structural configurations such as core/shell quantum dots, seeded nanorods, and nanoplatelets, incorporated with magnetic ions such as Mn2+, Ni2+, and Cu1+/2+ are highlighted. These materials have recently been investigated by us using state-of-the-art steady-state and transient optically detected magnetic resonance (ODMR) spectroscopy to explore individual spin-dynamics between the photogenerated carriers and magnetic ions and their dependence on morphology, location, crystal composition, and type of the magnetic ion. The information extracted from the analyses of the ODMR spectra in those studies exposes fundamental physical parameters, such as g-factors, exchange coupling constants, and hyperfine interactions, together providing insights into the nature of the carrier (electron, hole, dopant), its local surroundings (isotropic/anisotropic), and spin dynamics. The findings illuminate the importance of ODMR spectroscopy in advancing our understanding of the role of magnetic ions in semiconductor nanocrystals and offer valuable knowledge for designing magnetic materials intended for various spin-related technologies