Half metallic digital ferromagnetic heterostructure composed of a $δ$-doped layer of Mn in Si

Details Half metallic digital ferromagnetic heterostructure composed of a $δ$-doped layer of Mn in Si Half metallic digital ferromagnetic heterostructure composed of a $δ$-doped layer of Mn in Si

2005-08-10

arxiv.org/abs/cond-mat/0508269v2

Phys. Rev. Lett. 96, 027211 (2006).

Physics

Condensed Matter

Materials Science

4 pages, 4 figures, Revised version, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.96.027211

We propose and investigate the properties of a digital ferromagnetic heterostructure (DFH) consisting of a $\delta$-doped layer of Mn in Si, using \textit{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. Analysis of the total and partial densities of states, band structure, Fermi surfaces and associated charge density reveals the marked two-dimensional nature of the half metallicity. The band lineup is found to be favorable for retaining the half metal character to near the Curie temperature ($T_{C}$). Being Si based and possibly having a high $T_{C}$ as suggested by an experiment on dilutely doped Mn in Si, the heterostructure may be of special interest for integration into mature Si technologies for spintronic applications.

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