Open AccessSingle spin channels in Ni-doped CoTiSb semiconductor
Author(s) -
Chang Yue-Hua,
Pan Ru-Jing,
Si Yu-Hao,
Tingting Lin,
WU Zhi-min,
Guodong Liu,
Yuting Cui
Publication year - 2016
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.65.087102
Subject(s) - nanopillar , materials science , semiconductor , condensed matter physics , nickel , spin polarization , spins , fermi level , electron , nanotechnology , nanostructure , optoelectronics , physics , quantum mechanics , metallurgy
Since the spin-transfer effect was predicted in 1996, the direct-current-switched magnetic storage has received much attention. A slender nanopillar with high spin-polarized ratio of the conductive electrons is the most favorable for realizing the direct-current-switched magnetic memory. Wang et al. (Sup. Mic. 2015 86 493) showed a supercell idea used to design the nanopillar array in a semiconductor matrix. Based on this idea, in this paper, the Ni-based single atomic chains are designed in the semiconductive CoTiSb matrix by continuously substituting Ni for Ti, Sb, or Ti-Sb in the [001] crystallographic direction. These single atomic chains are uniformly distributed in the matrix. We investigate the electronic structures and magnetic properties of CoTiSb supercells with the Ni-based single atomic chains by using the first-principle calculations. The calculation results show that the single atomic chains of Ni-Sb (achieved by substituting Ni for Ti) have a high spin polarization and hole conduction properties. The single atomic chain of Ni-Ti (achieved by substituting Ni for Sb) and Ni-Ni single atomic chain (achieved by substituting Ni for Ti and Sb) both have a 100% spin polarization ration at the Fermi level. The Ni-based single atomic chain has an effect on the electronic structures of other atoms surrounding it in about a lattice length and forms a nanopillar with the center of the Ni-based single atomic chain. We predict that CoTiSb matrixes with the Ni-Ti and Ni-Ni single atomic chains will be good candidates for the direct-current-switched magnetic storage.