期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 136, 期 15, 页码 5664-5669出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja412317s
关键词
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资金
- National Key Basic Research Program [2011CB921404, 2012CB922001]
- NSFC [21121003, 91021004, 20933006, 11004180, 51172223]
- Strategic Priority Research Program of CAS [XDB01020300]
- Fundamental Research Funds for the Central Universities [WK2060140014, WK2060190025]
- USTCSCC, Supercomputer Center
- SCCAS, Supercomputer Center
- Tianjin, Supercomputer Center
- Shanghai Supercomputer Center
Exploring half-metallic materials with high Curie temperature, wide half-metallic gap, and large magnetic anisotropy energy is one of the effective solutions to develop high-performance spintronic devices. Using first-principles calculations, we design a practicable half-metal based on a layered La(Mn0.5Zn0.5)AsO alloy via element substitutions. At its ground state, the pristine La(Mn0.5Zn0.5)AsO alloy is an antiferromagnetic semiconductor. Either hole doping via (Ca2+/Sr2+,La3+) substitutions or electron doping via (H-/F-,O2-) substitutions in the [LaO](+) layer induce half-metallicity in the La(Mn0.5Zn0.5)AsO alloy. The half-metallic gap is as large as 0.74 eV. Monte Carlo simulations based on the Ising model predict a Curie temperature of 475 K for 25% Ca doping and 600 K for 50% H doping, respectively. Moreover, the quasi two-dimensional structure endows the doped La(Mn,Zn)AsO alloy a sizable magnetic anisotropy energy with the magnitude of at least one order larger than those of Fe, Co, and Ni bulks.
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