A Green's function model for ferromagnetism and spin excitations of (Ga Mn)As diluted magnetic semiconductors

doi:10.1088/1674-1056/18/11/073

Abstract

Abstract We study (Ga, Mn)As diluted magnetic semiconductors in terms of the Ruderman--Kittel--Kasuya--Yosida quantum spin model in Green's function approach. Random distributions of the magnetic atoms are treated by using an analytical average of magnetic configurations. Average magnetic moments and spin excitation spectra as functions of temperature can be obtained by solving self-consistent equations, and the Curie temperature T_C is given explicitly. T_C is proportional to magnetic atomic concentration, and there exists a maximum for T_C as a function of carrier concentration. Applied to (Ga, Mn)As, the theoretical results are consistent with experiment and the experimental T_C can be obtained with reasonable parameters. This modelling can also be applied to other diluted magnetic semiconductors.

Keywords: diluted magnetic semiconductor Green's function Ruderman--Kittel--Kasuya--Yosida

Received: 04 May 2009
Revised: 31 May 2009
Accepted manuscript online:

PACS:	75.30.Et	(Exchange and superexchange interactions)
	75.50.Pp	(Magnetic semiconductors)
	75.50.Dd	(Nonmetallic ferromagnetic materials)
	75.30.Cr	(Saturation moments and magnetic susceptibilities)
	75.30.Kz	(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
	75.10.-b	(General theory and models of magnetic ordering)

Fund: Project supported by the National Nature Science Foundation of China (Grant Nos 10774180, 90406010 and 6062109), Funds of the Chinese Academy of Sciences for Key Topics in Innovation Engineering (Grant No KJCX2.YW.W09-5) and the National Basic Research Program of China (Grant No 2005CB623602).

Cite this article:

Liu Gui-Bin(刘贵斌) and Liu Bang-Gui(刘邦贵) A Green's function model for ferromagnetism and spin excitations of (Ga Mn)As diluted magnetic semiconductors 2009 Chin. Phys. B 18 5047

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A Green's function model for ferromagnetism and spin excitations of (Ga Mn)As diluted magnetic semiconductors

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