Electronic and magnetic properties of zinc blende half-metal superlattices

Fong, C.Y.; Qian, M.C.; Pask, J.E.; Yang, L.H.; Dag, S.
January 2004
Applied Physics Letters;1/12/2004, Vol. 84 Issue 2, p239
Academic Journal
Zinc blende half-metallic compounds such as CrAs, with large magnetic moments and high Curie temperatures, are promising materials for spintronic applications. We explore layered materials, consisting of alternating layers of zinc blende half-metals, by first principles calculations, and find that superlattices of (CrAs)[sub 1](MnAs)[sub 1] and (CrAs)[sub 2](MnAs)[sub 2] are half-metallic with magnetic moments of 7.0μ[sub B] and 14.0μ[sub B] per unit cell, respectively. We discuss the nature of the bonding and half-metallicity in these materials and, based on the understanding acquired, develop a simple expression for the magnetic moment in such materials. We explore the range of lattice constants over which half-metallicity is manifested, and suggest corresponding substrates for growth in thin film form. © 2004 American Institute of Physics.


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