Skip to main content
eScholarship
Open Access Publications from the University of California

Half-Metallic Digital Ferromagnetic Heterostructure Composed of a Delta-Doped Layer of Mn in Si

  • Author(s): Qian, M. C.
  • Fong, C. Y.
  • Liu, Kai
  • Pickett, W. E.
  • Pask, J. E.
  • Yang, L. H.
  • et al.
Abstract

We propose and investigate the properties of a digital ferromagnetic heterostructure consisting of a delta-doped layer of Mn in Si, using ab initio electronic-structure methods. We find that (i) ferromagnetic order of the Mn layer is energetically favorable relative to antiferromagnetic, and (ii) the heterostructure is a two-dimensional half-metallic system. The metallic behavior is contributed by three majority-spin bands originating from hybridized Mn-d and nearest-neighbor Si-p states, and the corresponding carriers are responsible for the ferromagnetic order in the Mn layer. The minority-spin channel has a calculated semiconducting gap of 0.25 eV. The band lineup is found to be favorable for retaining the half-metal character to near the Curie temperature. This kind of heterostructure may be of special interest for integration into mature Si technologies for spintronic applications.

Many UC-authored scholarly publications are freely available on this site because of the UC Academic Senate's Open Access Policy. Let us know how this access is important for you.

Main Content
Current View