Origin and control of ferromagnetism in dilute magnetic semiconductors and oxides

Abstract

The author reviews the present understanding of the hole-mediated ferromagnetism in magnetically doped semiconductors and oxides as well as the origin of high temperature ferromagnetism in materials containing no valence band holes. It is argued that in these systems spinodal decomposition into regions with a large and a small concentration of magnetic component takes place. This self-organized assembling of magnetic nanocrystals can be controlled by co-doping and growth conditions. Functionalities of these multicomponent systems are described together with prospects for their applications in spintronics, nanoelectronics, photonics, plasmonics, and thermoelectrics.

arXiv commentreview, 7 pages, 52nd MMM Conference, Tampa Nov. 2007, J. Appl. Phys, in press

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• Spinodal nanodecomposition in magnetically doped semiconductors
• Controlled aggregation of magnetic ions in a semiconductor. Experimental demonstration
• Embedded magnetic phases in (Ga,Fe)N: the key role of growth temperature
• Optimization of Mn Doping in Group-IV-based Dilute Magnetic Semiconductors by Electronic Co-dopants
• Local structure of (Ga,Fe)N and (Ga,Fe)N:Si investigated by x-ray absorption fine structure spectroscopy
• Formation process and superparamagnetic properties of (Mn,Ga)As nanocrystals in GaAs fabricated by annealing of (Ga,Mn)As layers with low Mn content
• Ion-beam modification of the magnetic properties of GaMnAs epilayers
• Element specific characterization of heterogeneous magnetism in (Ga,Fe)N films
• Voids and Mn-rich inclusions in a (Ga,Mn)As ferromagnetic semiconductor investigated by transmission electron microscopy
• Electronic and optical properties of ferromagnetic GaMnAs in a multi-band tight-binding approach
• Unconventional ferromagnetism and transport properties of (In,Mn)Sb dilute magnetic semiconductor
• Characterization of Fe-N nano crystals and nitrogen-containing inclusions in (Ga,Fe)N thin films using transmission electron microscopy
• Ferromagnetic ordering in dilute magnetic dielectrics with and without free carriers
• Magnetic circular dichroism in GaMnAs: (no) evidence for an impurity band
• Simulation study of ballistic spin-MOSFET devices with ferromagnetic channels based on some Heusler and oxide compounds
• Metal-insulator transition induced by fluctuations of the magnetic potential in semiconductors with magnetic impurities
• Structural properties of Co${}_2$TiSi films on GaAs(001)
• From narrow-gap and semimagnetic semiconductors to spintronics and topological matter: a life with spins