Abstract
Abstracts We successfully synthesized the ZnS:Mn 2+ nanowires (NWs) with different Mn 2+ doping concentration by the simple hydrothermal method. The optical and magnetic properties can be well tuned by the Mn 2+ doping concentration. The yellow–orange emission from the Mn 2+ 4T 1 –6A 1 transition can be observed in the PL spectra of ZnS:Mn 2+ NWs and the intensity reaches a maximum when the concentration of Mn 2+ is 3%. The room-temperature magnetic hysteresis loops of the ZnS:Mn 2+ NWs indicate that when the Mn 2+ doping concentration is smaller than 3% ( x ≤3%)，the samples exhibit the ferromagnetism characteristics; meanwhile, once the Mn 2+ doping concentration is higher than 3% ( x >3%), the samples exhibited a ferromagnetism including part paramagnetic characteristics at room-temperature. This variation tendency can be well explained by the competition mechanism between two exchange interactions, i.e. the antiferromagnetic exchange interaction between the near neighbor Mn 2+ and Mn 2+ ions, and the ferromagnetic exchange interaction between the Mn 2+ and Mn 2+ ions mediated by their near neighbor S 2− ions or native defects such as S vacancies.
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