Abstract
β-Ag2Se is a topologically nontrivial insulator. The magnetic properties of Co-doped Ag2Se nanoparticles with Co concentrations up to 40% were investigated. The cusp of zero-field-cooling magnetization curves and the low-temperature hysteresis loops were observed. With increasing concentration of Co2+ ions mainly substituting AgI sites in the Ag2Se structure, the resistivity, Curie temperature Tc, and magnetization increased. At 10 T, a sharp drop of resistance near Tc was detected due to Co dopants. The ferromagnetic behavior in Co-doped Ag2Se might result from the intra-layer ferromagnetic coupling and surface spin. This magnetic semiconductor is a promising candidate in electronics and spintronics.
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