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The origin for high hole concentration in Mg‐doped GaN films grown by metal‐modulated epitaxy has been explored. We observe a Mg acceptor band characterized by a broad emission without phonon replicas and a high energy tail that overlaps with the valence band of GaN, giving rise to a reduced effective Mg activation energy. We attribute the high hole concentrations to the reduction of compensating...
Zero‐field cooling (ZFC) exchange bias (EB) was observed in antiperovskite compounds Ga1–xNMn3+x (x = 0.06 and 0.1). The existence of ferromagnetic (FM) clusters has been demonstrated in a spin glass (SG) matrix. The ZFC‐EB is suggested to originate from the unidirectional anisotropy formed isothermally along the FM/SG interface. For this typical physical system, both ways including the initial magnetization...
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