Intrinsic defects and ferromagnetic coupling in irradiated GaN layers

Details Intrinsic defects and ferromagnetic coupling in irradiated GaN layers Intrinsic defects and ferromagnetic coupling in irradiated GaN layers

2012-03-06

arxiv.org/abs/1203.1142v2

Physics

Condensed Matter

Materials Science

3 pages, 3 figures

Scientific paper

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$\div8.3\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 $H_{C}$$ $$\approx$$ 270\;$Oe indicate transformation of magnetic order from superparamagnetic blocking to ferromagnetic coupling with increasing Ga-vacancy content.

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