Journal ArticleDOI
Enhancement of interactions between magnetic ions in semiconductors due to declustering
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TLDR
Using first-principles electronic structure calculations of Mn impurities in GaAs, this article showed that the exchange interaction between two magnetic ions depends also on the concentration and spatial arrangement of the other, "spectator" magnetic ions.Abstract:
It is often assumed that the exchange interaction between two magnetic ions in a semiconductor host depends only on the distance and orientation of the magnetic ions. Using first-principles electronic structure calculations of Mn impurities in GaAs, we show that the exchange interaction between two magnetic ions depends also on the concentration and spatial arrangement of the other, “spectator” magnetic ions. Thus, such systems cannot be described by a Heisenberg Hamiltonian with fixed exchange interactions. Specifically, we find that at fixed Mn concentration, association “clustering” of Mn impurities leads to a decrease of the Curie temperature, while dissociation “declustering” leads to higher Curie temperatures. We conclude that clustering is the major impediment to achieve high Curie temperatures in Mn-doped GaAs.read more
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Book ChapterDOI
Chapter 8 Magnetic Impurities in Wide Band‐gap III–V Semiconductors
Agnieszka Wolos,Maria Kaminska +1 more
TL;DR: In this article, the magnetic impurities in wide band-gap III-V semiconductors are discussed and the general properties of diluted magnetic semiconductor (DMS) that result because of the presence of magnetic ions along with the nature of Mn impurity in III-v semiconductor.
Journal ArticleDOI
Design rules to achieve high-TC ferromagnetism in (Ga, Mn)As alloys
TL;DR: A set of first-principle-calculated Curie temperatures are used to uncover the rules that govern the dependence of T(C) on the configuration of Mn substitutional impurities in GaAs, suggesting simple atom-by-atom strategies to achieve high T (C) in (Ga, Mn)As alloys.
Journal ArticleDOI
Effect of impurity clustering on ferromagnetism in dilute magnetic semiconductors
Shi-Jie Xiong,Y.W. Du +1 more
TL;DR: In this article, the effect of clustering of impurities on the ferromagnetism in dilute magnetic semiconductors (DMS) was investigated and the Curie temperature T c was calculated by the mean-field theory on a lattice with randomly distributed clusters of magnetic impurities which are interacting with each other by carrier mediated RKKY exchange coupling together with the nearest-neighbor (NN) direct exchange interaction.