Sulfur antisite-induced intrinsic high-temperature ferromagnetism in Ag2S:Y nanocrystals
Literature Information
Pan Wang, Tianye Yang, Rui Zhao, Mingzhe Zhang
There is an urgent need for a complete understanding of intrinsic ferromagnetism, due to the necessity for application of ferromagnetic semiconductors. Here, further insight into the magnetic mechanism of sulfur antisite-induced intrinsic high-temperature ferromagnetism is investigated in Ag2S:Y nanocrystals. The gas–liquid phase chemical deposition method is adopted to obtain the monoclinic Ag2S:Y nanocrystals. The field and temperature-dependent magnetization measurements demonstrate the robust high-temperature ferromagnetism of Ag2S:Y nanocrystals. As revealed in the magnetic origin study from first-principles calculations, the intrinsic sulfur antisite defect is only responsible for the creation of a magnetic moment which mainly comes from the S 3p and Ag 4d orbitals. Such a mechanism, which is essentially different from those of dopants and other native defects, provides new insight into the origin of the magnetism.
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