Structural and magnetic properties of iron on modulation-doped (001) GaAs and on modulation-doped InAs heterostructures

We study hybrid structures comprising a ferromagnetic metal layer on III/V compound heterostructures in view of spintronic applications. While iron on modulation-doped (001)GaAs is a well-established system, corresponding experiments of iron on InAs-HEMTs are not appeared so far. InAs is of high interest because of the low Schottky barrier and strong spin-orbit coupling. In this talk, I give an account of the growth and strain relaxation of iron on modulation-doped (001)GaAs and on inverted modulation-doped InAs heterostructures investigated with in-situ reflection high-energy electron diffraction (RHEED). Furthermore, we employed high-resolution X-ray diffraction and magneto-optical Kerr measurements to investigate structural as well as magnetic properties of these structures.