  Recently, two-dimensional materials and nanoparticles with robust
ferromagnetism are even of great interest to explore basic physics in nanoscale
spintronics. More importantly, room-temperature magnetic semiconducting
materials with high Curie temperature is essential for developing
next-generation spintronic and quantum computing devices. Here, we develop a
theoretical model on the basis of density functional theory calculations and
the Ruderman-Kittel-Kasuya-Yoshida theory to predict the thermal stability of
two-dimensional magnetic materials. Compared with other rare-earth (dysprosium
(Dy) and erbium (Er)) and 3d (copper (Cu)) impurities, holmium-doped (Ho-doped)
single-layer 1H-MoS2 is proposed as promising semiconductor with robust
magnetism. The calculations at the level of hybrid HSE06 functional predict a
Curie temperature much higher than room temperature. Ho-doped MoS2 sheet
possesses fully spin-polarized valence and conduction bands, which is a
prerequisite for flexible spintronic applications.
