Work

Theory of Diluted Magnetic Semiconductor Ferromagnetism

Year: 2000

Type: article

Abstract: We present a theory of carrier-induced ferromagnetism in diluted magnetic semiconductors ( III1-xMnxV) which allows for arbitrary itinerant-carrier spin polarization and dynamic correlations. Both ingredients are essential in identifying the system's elementary excitations and describing their properties. We find a branch of collective modes, in addition to the spin waves and Stoner continuum which occur in metallic ferromagnets, and predict that the low-temperature spin stiffness is independent of the strength of the exchange coupling between magnetic ions and itinerant carriers. We discuss the temperature dependence of the magnetization and the heat capacity.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.84.5628

Authors: Jürgen König, Hsiu-Hau Lin, Allan H. MacDonald

Institutions: Indiana University Bloomington, Indiana University, National Tsing Hua University

Language: English

Topic: Magnetic and transport properties of perovskites and related materials

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, Deutsche Forschungsgemeinschaft, Division of Materials Research

Award: Condensed Matter Theory