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Zhu Z.,Changsha University of Science and Technology | Zhu Z.,Hunan Prov Higher Educ Key Laboratory Of Modeling And Monitoring On The Near Earth Electromagnetic Environments | Zhang Z.H.,Changsha University of Science and Technology | Zhang Z.H.,Hunan Prov Higher Educ Key Laboratory Of Modeling And Monitoring On The Near Earth Electromagnetic Environments | And 8 more authors.
Journal of Materials Chemistry C | Year: 2015

Exploring half-metallic nanostructures with a high Curie temperature and a wide half-metallic gap is a crucial solution for developing high-performance spintronic devices. Using the first-principles method, we design a new magnetic structure based on edge modification of armchair-edged graphene nanoribbons by Mn and F atoms (AGNR-Mn-F2). It is found that such a structure is an excellent half-metal with a wide bandgap (∼1.2 eV) and a stable magnetic ordering by a very high Curie temperature (Tc > 700 K) as well as being predicted to stably exist in a very large chemical potential range in experiment by the Gibbs free energy. And it is also shown that it possesses an outstanding magnetic device nature, such as a spin polarization of 100% in a very large bias region, a dual spin diode-like rectification ratio up to 105, and a spin-valve feature with a giant magnetoresistance approaching 108%, indicating a promising application for developing spintronic devices. © 2015 The Royal Society of Chemistry.

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