High Curie temperatures in (Ga,Mn)N from Mn clustering

Abstract

The effect of microscopic Mn cluster distribution on the Curie temperature (Tc) is studied using density-functional calculations. We find that the calculated Tc depends crucially on the microscopic cluster distribution, which can explain the abnormally large variations in experimental Tc values from a few K to well above room temperature. The partially dimerized Mn_2-Mn_1 distribution is found to give the highest Tc > 500 K, and in general, the presence of the Mn_2 dimer has a tendency to enhance Tc. The lowest Tc values close to zero are obtained for the Mn_4-Mn_1 and Mn_4-Mn_3 distributions.

To appear in Applied Phyiscs Letters

References in corpus (7)

• Giant Magnetic Moments of Nitrogen Stabilized Mn Clusters and Their Relevance to Ferromagnetism in Mn Doped GaN
• Calculating the Curie Temperature reliably in diluted III-V ferromagnetic semiconductors
• On-site Coulomb interaction and the magnetism of (GaMn)N and (GaMn)As
• Role of Disorder in Mn:GaAs, Cr:GaAs, and Cr:GaN
• Intrinsic hole localization mechanism in magnetic semiconductors
• Electronic and magnetic properties of substitutional Mn clusters in (Ga,Mn)As
• Ferromagnetic (Ga,Mn)N epilayers versus antiferromagnetic GaMn${}_3$N clusters

Cited by in corpus (7)

• Spinodal nanodecomposition in magnetically doped semiconductors
• Screening magnetic two-dimensional atomic crystals with nontrivial electronic topology
• GaAs:Mn nanowires grown by molecular beam epitaxy of (Ga,Mn)As at MnAs segregation conditions
• Nanoscale inhomogeneities: A new path toward high Curie temperature ferromagnetism in diluted materials
• Magnetism in Cr-doped ZnS: Density-functional theory studies
• Antiferromagnetic order in (Ga,Mn)N nanocrystals: A density functional theory study
• Quantum confinement : A route to enhance the Curie temperature of Mn doped GaAs