Effect of microstructural evolution on magnetic property of Mn-implanted p-type GaN

Abstract

The microstructural evolution of Mn-implanted p-type GaN has been studied using cross-sectional transmission electron microscopy. As Mn3Ga nanoclusters (3-7 nm) with a hexagonal structure were produced by annealing (less than or equal to800 degreesC), the weak ferromagnetic property emerged. Higher-temperature annealing (greater than or equal to900 degreesC) reduced the ferromagnetic signal and produced antiferromagnetic Mn-nitride nanoclusters, such as Mn6N2.58 and Mn3N2. This provides evidence that the ferromagnetic property was deeply related to microstructural changes of nanoclusters. (C) 2003 American Institute of Physics.