Optical, structural, and magnetic properties of p-type InMnP:Zn implanted with the Mn (1 and 10Â at.%)

The p-type InP:Zn was prepared by the liquid encapsulated Czochralski method and subsequently implanted with Mn+ of 5×1015 cm−2 (1 at.%) and 5×1016 cm−2 (10 at.%). The results of energy dispersive X-ray showed that the concentrations of Mn incorporated into InP:Zn is about 1 and 10 at.%. For photoluminescence measurements, the Mn-related optical transitions of the InMnP:Zn samples annealed at 350 ∘C for 60 s and at 450 ∘C for 30 s with Mn (1 at.%) were broadly observed at the energy region around 1.0 eV. The InMnP:Zn samples implanted with Mn (1 at.%) clearly showed ferromagnetic hysteresis loops at 10 K, and the ferromagnetic behavior was observed to persist up to 291 K. Curie temperature (TC) at 291 K has originated from MnP. The InMnP:Zn samples implanted with Mn (10 at.%) were annealed at 350 ∘C for 60 s and at 450 ∘C for 30 s. Using transmittance electron microscopy, both single crystalline and polycrystalline structures containing MnP and InMn3 sized ∼20 nm were observed depending on the annealing condition. These samples exhibited two different Curie temperatures: TC1 at 291 K and another (TC2) well above 291 K. The high-temperature ferromagnetic behavior up to TC1 and above TC2 is believed to have originated from two magnetic MnP and InMn3 phases, respectively.