Structural and magnetic phase stability of group IV/MnAs superlattices for spintronics applications

Miyoung Kim, J. J. Lee, Arthur J Freeman

Research output: Contribution to journalArticle

Abstract

Results of first-principles electronic structure calculations and experiments on molecular beam epitaxy grown samples of Group IV/MnAs superlattices where Group IV=Si and Ge are reported. The structural and magnetic phase stabilities were determined by total energy and atomic force calculations using the full-potential linearized augmented plane-wave (FLAPW) method within the generalized gradient approximation. The zincblende MnAs layers in these superlattices showed interesting behavior, such as different magnetic phase transitions and half-metallicity where the competition between the exchange interaction of Mn atoms through direct d-d and indirect p-d channels played an important role. For example, for the Si/MnAs case, the antiferromagnetic (AFM) ground state makes a transition to a ferromagnetic (FM) phase upon a 2% tetragonal distortion. A comparison of the electronic structures of the Si/MnAs and Ge/MnAs superlattices exhibits the dependence of the magnetism and the magnetic phase stability on the interatomic distance as well as on the host anion. Experimental results on the Si/MnAs superlattice revealed that AFM ordering is found to be stable over the FM phase while the Ge/MnAs superlattice showed a dominant FM phase at zero temperature.

Original languageEnglish
Pages (from-to)2144-2146
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume310
Issue number2 SUPPL. PART 3
DOIs
Publication statusPublished - Mar 2007

Fingerprint

Magnetoelectronics
Phase stability
Superlattices
superlattices
Electronic structure
electronic structure
Exchange interactions
zincblende
Magnetism
Electron transitions
Molecular beam epitaxy
Ground state
metallicity
Anions
plane waves
Negative ions
molecular beam epitaxy
Phase transitions
anions
Atoms

Keywords

  • First-principles calculation
  • FLAPW
  • Group IV/MnAs superlattice
  • Half metallicity

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Structural and magnetic phase stability of group IV/MnAs superlattices for spintronics applications. / Kim, Miyoung; Lee, J. J.; Freeman, Arthur J.

In: Journal of Magnetism and Magnetic Materials, Vol. 310, No. 2 SUPPL. PART 3, 03.2007, p. 2144-2146.

Research output: Contribution to journalArticle

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