Identification of the interstitial Mn site in ferromagnetic (Ga,Mn)As

We determined the lattice location of Mn in ferromagnetic (Ga,Mn)As using the electron emission channeling technique. We show that interstitial Mn occupies the tetrahedral site with As nearest neighbors (TAs) both before and after thermal annealing at 200 °C, whereas the occupancy of the tetrahedral...

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Detalles Bibliográficos
Autores principales: De Lemos Lima, Tiago Abel, Wahl, Ulrich, Augustyns, Valerie, Silva, Daniel, Granadeiro Costa, Angelo Rafael, Houben, K, Edmonds, Kevin W, Gallagher, BL, Campion, RP, Van Bael, MJ, Castro Ribeiro Da Silva, Manuel, Martins Correia, Joao, Esteves De Araujo, Araujo Joao Pedro, Temst, Kristiaan, Vantomme, André, Da Costa Pereira, Lino Miguel
Lenguaje:eng
Publicado: 2015
Materias:
Condensed Matter
Acceso en línea:https://dx.doi.org/10.1063/1.4905556
http://cds.cern.ch/record/2242886
Descripción
Sumario:We determined the lattice location of Mn in ferromagnetic (Ga,Mn)As using the electron emission channeling technique. We show that interstitial Mn occupies the tetrahedral site with As nearest neighbors (TAs) both before and after thermal annealing at 200 °C, whereas the occupancy of the tetrahedral site with Ga nearest neighbors (TGa) is negligible. TAs is therefore the energetically favorable site for interstitial Mn in isolated form as well as when forming complexes with substitutional Mn. These results shed new light on the long standing controversy regarding TAs versus TGa occupancy of interstitial Mn in (Ga,Mn)As.

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