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• Magnetic behavior of MoS 2 -SC, MoS 2 -NP and 2D bi-layer-MoS 2 thin films. • M−H hysteresis loops measured at 300 K. • Room temperature ferromagnetism in 2D bi-layer-MoS 2. • MoS 2 -SC/MoS 2 -NP shows diamagnetism/paramagnetic. Comparisons of magnetic behavior of pristine single crystal-MoS 2 (MoS 2 -SC), nanoparticle-MoS 2 (MoS 2 -NP) and two-dimensional (2D) bi-layer-MoS 2 thin film were investigated by the M−H hysteresis loops measured at 300 K, using the superconducting quantum interface device-type magnetometer. Results clearly shows that the room temperature ferromagnetism in 2D bi-layer-MoS 2 with saturation of magnetization ∼ 10 × 10-4 emu/g, whereas pristine MoS 2 -SC / MoS 2 -NP shows diamagnetism/paramagnetic behaviour. The X-ray photoelectron and Raman spectroscopy results confirms the observed ferro-magnetization in 2D bi-layer-MoS 2 is related to the presence of edge spins on the edges of layers, S-vacancies (defects at the grain boundaries region) and higher density of states. This 2D bi-layer-MoS 2 may find applications in nanodevices and spintronics by controlling the edge structures. [ABSTRACT FROM AUTHOR]