Optical, structural, and magnetic properties of p-type InMnP:Zn implanted with the Mn (1 and 10 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 ^{{ring operator}}C for 60 s and at 450 ^{{ring operator}}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 (T_C) at 291 K has originated from MnP. The InMnP:Zn samples implanted with Mn (10 at.%) were annealed at 350 ^{{ring operator}}C for 60 s and at 450 ^{{ring operator}}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: T _C1 at 291 K and another (T_{C 2}) well above 291 K. The high-temperature ferromagnetic behavior up to T_{C 1} and above T_{C 2} is believed to have originated from two magnetic MnP and InMn₃ phases, respectively.