Antiferromagnetism in epilayers and superlattices containing zinc‐blende MnSe and MnTe

University of Notre Dame, Notre Dame, Indiana 46556
Journal of Applied Physics (Impact Factor: 2.21). 12/1991; DOI: 10.1063/1.350001
Source: IEEE Xplore

ABSTRACT New zinc‐blende Mn‐based magnetic semiconductors offer unique insights into the magnetic order and critical behavior of frustrated antiferromagnets. Molecular beam epitaxy grown samples exist both in the form of strained superlattices, with strain induced anisotropies (MnSe/ZnSe and MnTe/ZnTe), and in the form of near‐isotropic bulk MnTe. The tetragonally distorted strained superlattices exhibit a second‐order phase transition, consistent with symmetry arguments favoring such behavior. In contrast, the bulk‐like epitaxial layers of MnTe have a first‐order phase transition, associated with magnetostriction, unknown to an unaccounted for by the previous studies.

  • [Show abstract] [Hide abstract]
    ABSTRACT: Thin films of MnTe having zinc‐blende structure were grown on BaF2(111) substrates under various growth conditions by molecular beam epitaxy. The structural properties of the deposited films were characterized by x‐ray diffraction which evidenced sometimes the presence of other crystallographic phases apart from a dominating zinc‐blende‐like phase. Detailed measurements of symmetrical and asymmetrical reflections showed that the unit cell of (111) MnTe is not cubic, as is the case of epitaxial (001) MnTe, but it is distorted to an orthorhombic one. The transparent BaF2 substrates enabled optical measurements in transmission, thus, permitting a study of the band structure of the material in the vicinity of its fundamental band gap. © 1996 American Institute of Physics.
    Applied Physics Letters 06/1996; 68(26):3796-3798. · 3.52 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The observed correlation in antiferromagnetic (AFM) ordering across a nonmagnetic spacer is interpreted in the framework of the phenomenological model. It is shown that the magnetostriction of one magnetically ordered layer produces a strain field of the same symmetry in the next magnetic layer via the spacer. Such an induced anisotropy favors a correlated orientation of the magnetic moments in all the layers. The value of the induced anisotropy is proportional to the magnetostriction constant and it exponentially decreases with an increase of the spacer thickness. A corresponding short-range interaction gives rise to an ordering of the AFM layers throughout the film thickness and reveals itself in a linewidth of neutron diffraction spectra. Theoretical predictions are in satisfactory agreement with the available experimental data.
    Physical Review B 01/2001; 64(5):054404. · 3.66 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Zinc-blende(zb) MnTe layers were grown by compositional conversion of ZnTe to MnTe, and structural property of the layers was examined. The growth rate and the thickness of the MnTe layers are much influenced by growth temperature and substrate orientation. The interdiffusion between ZnTe and MnTe shows strong anisotropic reaction rate. The resultant zb-MnTe layer, however, is found to be structurally and morphologically homogeneous.
    Applied Surface Science 01/2001; 169:325-330. · 2.54 Impact Factor