Material Science & Engineering World Conference 2026

Abstract

Semiconductor materials based on Ln3+ MnO3 oxides, as well as ZnO, TiO2, and others, are considered potential candidates for spintronics. The key task is to study the magnetic and electronic subsystems in these materials to better understand the mechanisms behind their formation. In this regard, magneto-circular dichroism (MCD) spectroscopy in the visible range is a valuable source of information. The effect itself is observed in transmitted light, and its signal is directly proportional to the real part of the off-diagonal component of the dielectric permittivity tensor.

It was first established for Ln_1-xR _{+3 x}MnO₃ and Ln_1-xR_{+ x}MnO₃ manganite films that the behavior of MCD reflects not only the electronic and magnetic states of the material but also its charge states. A characteristic magneto-optical response was revealed when the material transitioned into a conducting state. This behavior has been observed in films with various compositions, morphologies, and thicknesses. Notably, even the high-sensitivity XANES spectra show no significant difference between the metallic and dielectric states of manganite. It has been established that MCD spectroscopy also reflects changes in the band structure of diluted oxides based on ZnO. A relationship between the shape of the MCD spectrum and the various polarization states of charge carriers in the samples has been identified (Fig. 1). The observed phenomena indicate that changes in the band structure of the material can be studied using MCD spectroscopy.

Additionally, it has been revealed that MCD spectroscopy can serve as a tool for detecting metal nanoparticles in solid solution matrices based on ZnO and other similar oxides. This approach provides a qualitative alternative to X-ray absorption spectroscopy using synchrotron radiation.