Abstract
InMnP:Zn epilayers doped with Mn (0.290 at.%) were annealed at 723–873 K for 60 s and 473–573 K for 30 min. Using Auger electron spectroscopy, the changes in concentration profiles of the epilayers correlated to the ferromagnetic origin as a function of the annealing conditions. The epilayers annealed at 723–873 K for 60 s exhibited InMn 3 persisting up to 583 K. For InMnP:Zn epilayers annealed at 523–573 K for 30 min, the concentration depth profiles remained flat so that the stoichiometry was well maintained without precipitates such as InMn 3 and MnP comparable to the as-grown InP:Zn before doping Mn. These samples showed clear ferromagnetic hysteresis loops. Curie temperature was about 150 K. A ferromagnetic hysteresis loop was obtained even at very lower annealing temperature of 473 K.
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