L. Kilanski, F. Tuomisto, R. Szymczak, R. Kruszka
We present the studies magnetic properties of 2 MeV 4 He + -irradiated GaN grown by metal-organic chemical-vapor deposition. Particle irradiation allowed controllable introduction of Ga-vacancy in the samples. Vacancy-related magnetic moments with concentrations changing between 4.3{\div}8.3\times10^{17} cm^{-3} showing magnetic ordering at room temperature are observed. The appearance of clear hysteresis curve at T = 5 K with coercive field of about HC \approx 270 Oe indicate transformation of magnetic order from superparamagnetic blocking to ferromagnetic coupling with increasing Ga-vacancy content.
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http://arxiv.org/abs/1203.1142
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