Magnetic semiconductors are semiconductors such as GaAs and TiO2 doped with magnetic ions (mainly 3d transition metal elements) of several % concentrations. Magnetic semiconductors are key materials for Spintronics. We investigate electronic structures of magnetic semiconductors using synchrotron radiation spectroscopy (photoemission spectroscopy, x-ray magnetic circular dichroism, etc) to unveil the origin of the ferromagnetism in magnetic semiconductors.

Oxides have high thermal stability and have attracted much attention as alternative materials to semiconductors. We study electronic structures of devices/heterostructures using transition-metal oxides to understand the quantum physical properties.

Electronic structures of materials can be investigated by spectroscopy techniques using synchrotron radiation and laboratory light sources. In synchrotron radiation facilities, one use highly brilliant and focused x-rays with varying energy in wide range. The synchrotron radiation is ideal light source for the electronic structure analysis. We investigate electronic structures of functional materials using photoemission and synchrotron radiation spectroscopies.