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The measurements of the magnetic susceptibility, magnetization, electricalresistivity and magnetoresistance have been performed for the Fe intercalatedcompound Fe0.5TiS2. According to X-ray diffraction measurements the Fe0.5TiS2compound synthesized in the present work has a monoclinic crystal structure(space group I12/m1) which results from the ordering of Fe ions and vacanciesbetween S-Ti-S tri-layres. The changes in the heat-treatment conditions attemperatures below 1100 Celsius degrees do not lead to an order-disordertransition within the subsystem of intercalated Fe ions. It has been shown thatthis compound exhibits an antiferromagnetic (AF) ground state below the Neeltemperature TN = 140 K. Application of the magnetic field at T < TN induces ametamagnetic phase transition to the ferromagnetic (F) state, which isaccompanied by the large magnetoresistance effect (up to 27 %). Thefield-induced AF-F transition is found to be irreversible below ~ 100 K. Themagnetization reversal in the metastable F state at low temperatures isaccompanied by substantial hysteresis (~ 100 kOe) which is associated with theIsing character of Fe ions.

Field-induced high coercive ferromagnetic state and magnetoresistance in the antiferromagnetically ordered compound Fe0.5TiS2