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We report the structural and magnetic results of polar {\alpha}-GeTe dopedwith Sn and Mn from x = 0.185 to 0.841 and y = 0.02 to 0.086, respectively. Themagnetic results of Ge1-x-y(SnxMny)Te (GSMT) crystals identify Mn-clusteringeffect with scaling parameter, R = 0.033 for x ~ 0.2 and y = 0.06. Theexcessive Sn ions are assumed to drive the inception of short rangeferromagnetic clusters. For the crystals revealing glassy magnetic behavior,the irreversibility temperature, Tirr shifts at high dc magnetic field which iswell described by de Almeida-Thouless equation, {\delta}Tirr ~ H{\Phi}/2yielding {\Phi} values of 1.55 and 1.7 that validates the formation of Mnclusters. The spin relaxation time, {\tau}0 ~ 10-9 s, activation energy, Ea/kB~ 5 TF where TF is freeing temperature and Vogel-Fulcher temperature, T0 ~ TFalso signify intracluster interactions. Also, the Mn-hole magnetic exchangeconstant, Jpd drops from 0.24 eV for the samples with smaller Sn content of x ~0.2 to 0.16 eV for Sn rich alloy with x ~ 0.8. Consequently, we present amagnetic phase diagram for GSMT bulk crystals as a function of Mn(y) ions.

Magnetic phase diagram of Ge1-x-ySnxMnyTe multiferroic semiconductors; coexistence of ferromagnetic and cluster glass ordering