Ferromagnetism in epitaxial InMnSb films

The structure and ferromagnetic properties of epitaxial In$_{1-x}$Mn$_{x}$Sb semiconductor films deposited using metal-organic vapor phase epitaxy were investigated. Films were single phase as determined by x-ray diffraction for x = 0.01 to 0.05. A rocking curve width of 0.3 degrees was measured in $\theta $-2$\theta $ x-ray scans. XRD $\phi $-scans indicated that the films were epitaxial. Films are ferromagnetic at room temperature as indicated by hysteretic behavior. For an In$_{0.965}$Mn$_{0.035}$Sb epitaxial film a saturation magnetization (Ms) and coercive field (H$_{C})$ of 20 emu/cm3 and 240 G respectively were measured at 295 K. The field cooled and zero field cooled magnetization curves exhibit reversible behavior confirming the absence of any impurity phase. The temperature dependent magnetization was well-described by a Brillouin function. The Curie temperature (T$_{C})$ was above 400 K as determined from the field cooled magnetization temperature dependence. High temperature SQUID measurements will also be presented.