Surface magnetism of Mg doped AlN: A first principle study

Sandhya Chintalapati, Ming Yang, Shu Ping Lau, Yuan Ping Feng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)

Abstract

Using first-principles calculations, we have systematically investigated the magnetic propertiesof Mg-doped AlN 1 0 1 0 and 0 0 01 surfaces. Both the polar and non-polar surfaces arefound to be magnetic and the magnetic moments are mainly due to spin polarized 2p orbitalsof surface N atoms surrounding Mg. The splitting of energy levels in both cases favourscharge hopping between the minority spin states of N 2p orbitals, which leads to a stableferromagnetic ground state. However, the range of magnetic coupling and the stability of theferromagnetic state differ between the polar and non-polar surfaces and are dependent on thenature of localization of the defect states. The ferromagnetic state in a Mg-dopedreconstructed (0 0 0 ?1) surface is more stable than in a Mg-doped AlN (1 0 10) surface.
Original languageEnglish
Article number435801
JournalJournal of Physics Condensed Matter
Volume26
Issue number43
DOIs
Publication statusPublished - 29 Oct 2014

Keywords

  • dilute magnetic semiconductors
  • first principle calculations
  • surface magnetism

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this