Magnetic and structural properties of MnAs thin films on GaAs(111)B: Influence of the growth temperature
Résumé
The magnetic and structural properties of MnAs thin films grown on GaAs(111)B at different temperatures (160–280 °C) are investigated. A narrow optimum growth temperature window (200–240 °C) is found where the Curie temperature and the room temperature magnetization are maximized. High-resolution x-ray diffraction experiments are performed on the samples showing that the films are epitaxial for a minimum growth temperature of 200 °C. The room temperature fraction of the hexagonal phase is strongly dependent on the growth temperature in agreement with the magnetic properties.