Spin interactions of interstitial Mn ions in ferromagnetic GaMnAs

By J. Blinowski, P. Kacman. 2002

142 citations recorded by the source corpus.

The recently reported Rutherford backscattering and particle-induced x-ray emission experiments have revealed that in low-temperature molecular beam epitaxy grown Ga 1 - x Mn x As a significant part of the incorporated Mn atoms occupies tetrahedral interstitial sites in the lattice. Here we study the magnetic properties of these interstitial (Mn 1 ) ions. We show that they do not participate in the hole-induced ferromagnetism. Moreover, Mn 1 double donors may form pairs with the nearest substitutional (Mn G a ) acceptors-our calculations evidence that the spins in such pairs are antiferromagnetically coupled by the superexchange. We also show that for the Mn ion in another, hexagonal, interstitial position (which seems to be the case in the Ga 1 - x - y Mn x Be y As samples) the p-d interactions with the holes, responsible for the ferromagnetism, are very much suppressed.

Subfields: Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/1a63eb5e8edb604a4cc45d89b8af25a7607f8269

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In Electronic, Optical and Magnetic Materials

In Materials Chemistry

Citations in the corpus

Theory of ferromagnetic (III, Mn) V semiconductors (2006, methodology): “The net magnetic moment of such a pair is close to zero (Blinowski and Kacman, 2003; Edmonds et al., 2004a, 2005a; Mašek and Máca, 2003).”
Dilute ferromagnetic semiconductors: Physics and spintronic structures (2013, background): “At the same time, a strong antiferromagnetic interaction is expected for MnI-MnGa dimers (Blinowski and Kacman, 2003; Mašek et al., 2003).”