One-dimensional transition metal dihalide nanowires as robust bipolar magnetic semiconductors
| Autor: | Xingyi Tan, Hua-Hua Fu, Hui Xiang, Lili Liu, Gui-Fang Du, Ao Lou |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Nanoscale. 12:8942-8948 |
| ISSN: | 2040-3372 2040-3364 |
| DOI: | 10.1039/c9nr10849a |
| Popis: | One-dimensional (1D) materials with robust ferromagnetic ground states are difficult to achieve but provide a significant platform for potential spintronic device applications in future. Herein, a new family of 1D transition metal dihalide (TMCl2; where TM = Cu, Co, Cr) nanowires are proposed by using first-principles calculations. Their dynamic stability is ensured by Born-Oppenheimer molecular dynamics simulations. The electronic structures demonstrate that both CoCl2 and CuCl2 nanowires are promising bipolar magnetic semiconductors (BMSs) and can be converted into 1D half-metal materials by a small amount of carrier doping. The CrCl2 nanowire is an antiferromagnetic semiconductor (AFS). The formation of a BMS is attributed to the superexchange coupling between the Co/Cu atoms through the 3p orbitals in the Cl atoms. By using Monte Carlo simulations, we found that the CoCl2 nanowire has a Curie point of 6 K, while the CuCl2 nanowire has a corresponding Curie point of 14 K. Our results allow us to put forward a strategy to realize 1D BMSs and to design low-dimensional AF spintronic devices. |
| Databáze: | OpenAIRE |
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