Electronic structure and magnetism of Mn doped GaN

Abstract

Mn doped semiconductors are extremely interesting systems due to their novel magnetic properties suitable for the spintronics applications. It has been shown recently by both theory and experiment that Mn doped GaN systems have a very high Curie temperature compared to that of Mn doped GaAs systems. To understand the electronic and magnetic properties, we have studied Mn doped GaN system in detail by a first principles plane wave method. We show here the effect of varying Mn concentration on the electronic and magnetic properties. For dilute Mn concentration, $d$ states of Mn form an impurity band completely separated from the valence band states of the host GaN. This is in contrast to the Mn doped GaAs system where Mn $d$ states in the gap lie very close to the valence band edge and hybridizes strongly with the delocalized valence band states. To study the effects of electron correlation, LSDA+U calculations have been performed. Calculated exchange interaction in (Mn,Ga)N is short ranged in contrary to that in (Mn,Ga)As where the strength of the ferromagnetic coupling between Mn spins is not decreased substantially for large Mn-Mn separation. Also, the exchange interactions are anisotropic in different crystallographic directions due to the presence or absence of connectivity between Mn atoms through As bonds.

6 figures, submitted to Phys. Rev. B

References in corpus (3)

• Unconventional carrier-mediated ferromagnetism above room temperature in ion-implanted (Ga, Mn)P:C
• Ferromagnetism of magnetic semiconductors--Zhang-Rice limit
• Photoemission studies of Ga${}_{1-x}$Mn${}_x$As: Mn-concentration dependent properties

Cited by in corpus (24)

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• Intrinsic hole localization mechanism in magnetic semiconductors
• Electronic and magnetic properties of substitutional Mn clusters in (Ga,Mn)As
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• Jahn-Teller Distortion and Ferromagnetism in the Dilute Magnetic Semiconductors GaN:Mn
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• Magneto-optical spectroscopy of (Ga,Mn)N epilayers
• Electronic structure and Jahn-Teller effect in GaN:Mn and ZnS:Cr
• Antiferromagnetic order in (Ga,Mn)N nanocrystals: A density functional theory study
• Transition from Ferromagnetism to Antiferromagnetism in Ga${}_{1-x}$Mn${}_x$N
• What is the valence of Mn in Ga${}_{1-x}$Mn${}_x$N?
• Spin filter effect at room temperature in GaN/GaMnN ferromagnetic resonant tunneling diode
• Evidence for Carrier-Induced High-Tc Ferromagnetism in Mn-doped GaN film
• Impact of Next-Nearest-Neighbor hopping on Ferromagnetism in Diluted Magnetic Semiconductors
• Pair anisotropy in disordered magnetic systems