Zero‐Field And Field‐ Cooled Studies Of Gallium Nitride Implanted With Manganese Ions

Magnetic properties of Mn+ implanted gallium nitride samples were studied using SQUID techniques. Magnetization was measured as function of applied magnetic field and temperature to determine the coercive field and other magnetic properties. The saturation magnetization in the samples implanted with 1.75×1015, 1.5×1016 and 2×1016 ions cm−2 were found to be 1.15×10−5, 5.07×10−4 and 1.51×10−5 emu respectively. The decrease in the magnetism in the sample implanted for the fluence of 2×1016 ions cm−2 is due to presence of defects and disorder in the implanted sample. Zero‐field‐cooled (ZFC) and field‐cooled (FC) magnetization as function of temperature recorded for the entire Mn+ implanted samples showed the persistence of magnetism above the room temperature. The variation in the blocking temperature is due to anisotropy of the samples. The plot of the difference in the ZFC and FC curves for all the samples, showed the positive magnetization up to the room temperature.