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Materials 2010, 3(6), 3740-3776; doi:10.3390/ma3063740

Review

Carrier States in Ferromagnetic Semiconductors and Diluted Magnetic Semiconductors—Coherent Potential Approach—

Masao Takahashi

Kanagawa Institute of Technology, 1030 Shimo-Ogino, Atsugi, 243-0292, Japan

Received: 5 May 2010 / Accepted: 8 June 2010 / Published: 21 June 2010

(This article belongs to the Special Issue Ferromagnetic Semiconductors)

Download PDF Full-Text [1728 KB, uploaded 21 June 2010 10:23 CEST]

Abstract: The theoretical study of magnetic semiconductors using the dynamical coherent potential approximation (dynamical CPA) is briefly reviewed. First, we give the results for ferromagnetic semiconductors (FMSs) such as EuO and EuS by applying the dynamical CPA to the s-f model. Next, applying the dynamical CPA to a simple model for A_1−xMn_xB-type diluted magnetic semiconductors (DMSs), we show the results for three typical cases to clarify the nature and properties of the carrier states in DMSs. On the basis of this model, we discuss the difference in the optical band edges between II-V DMSs and III-V-based DMSs, and show that two types of ferromagnetism can occur in DMSs when carriers are introduced. The carrier-induced ferromagnetism of Ga_1−xMn_xAs is ascribed to a double-exchange (DE)-like mechanism realized in the magnetic impurity band/or in the band tail.

Keywords: magnetic semiconductor; coherent potential approximation (CPA); exchange interaction; carrier-induced ferromagnetism

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