Multiferroic Phase Transitions and Spin-Texture in Mn- and Cr-Doped GeTe

Multiferroics in which ferroelectricity and ferromagnetism coexist exhibit many extraordinary physical properties due to their peculiar spinpolarized electronic band structure and provide promising potentials for device applications. Magnetically doped GeTe is a prototypical example of a multiferroic system in which the strong spinorbit coupling leads to a giant RashbaZeeman splitting. In this project, ARPES and SARPES will be employed to unravel the evolution of the electronic structure and spin texture of Mnand Crdoped GeTe across the ferromagnetic and ferroelectric phase transition and derive how the RashbaZeeman splitting depends and can be tuned by the magnetic dopant concentration. Particular focus will be to compare the effect of the different doping species and to extend the studies to high magnetic dopant concentrations where high ferromagnetic Curie temperatures are obtained.