Skip to main content
Article thumbnail
Location of Repository

Enhancement of critical temperature and phases coexistence mediated by strain in MnAs epilayers grown on GaAs (111)B.

By N. Mattoso, Mahmoud Eddrief, J. Varalda, A. Ouerghi, Dominique Demaille, Victor H. Etgens and Y. Garreau

Abstract

The structural and magnetic properties of MnAs epilayers grown on GaAs(111)B have been investigated by x-ray diffraction and magnetometry. The strain evolution of the epilayer was followed during the phase transition by x-ray diffraction. The results show a high fraction of the ferromagnetic phase at room temperature and an elevated value of the structural phase transition temperature. The system is strongly affected by residual strains that are mainly located inside the phase. We attribute this behavior to an increase in the elastic energy density associated with the tight link between epilayer and substrate. It comes out that magnetic and structural properties of MnAs thin films are strongly dependent on the crystallographic relation between epilayer and substrate

Topics: elasticity, critical points, internal stresses, magnetic epitaxial layers, substrates, solid-state phase transformations, magnetisation, III-V semiconductors, crystal structure, ferromagnetic materials, gallium arsenide, manganese compounds, 68.35.Rh, 64.70.Kb, 61.50.Ks, [PHYS.COND.CM-GEN] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]
Publisher: American Physical Society
Year: 2004
DOI identifier: 10.1103/PhysRevB.70.115324
OAI identifier: oai:HAL:hal-00004553v1
Provided by: Hal-Diderot
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • https://hal.archives-ouvertes.... (external link)
  • https://hal.archives-ouvertes.... (external link)
  • https://hal.archives-ouvertes.... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.