Sonam Perween, Lalita, A. Rathi, R.P. Pant, B. Gahtori, P.D. Babu, G.A. Basheed

This work investigates the magneto-caloric effect and critical behavior in Mn${}_{3-x}$Fe${}_{x}$Sn_{2}
($x$ = 0.3, 0.7) alloys synthesized by arc melting method. The alloys show two successive second order magnetic phase transitions at *T*${}_{C1}$
$\approx $ 254 K (261 K) and *T*${}_{C2}$
$\approx $ 205 K (185 K), respectively for $x$ = 0.3 (0.7). The modified Arrot plot study around paramagnetic–ferromagnetic transition at *T*${}_{C1}$ reveals the critical exponent, $\beta $ = 0.397 (0.378) with long-range of magnetic interactions for $x$ = 0.3 (0.7). Importantly, the magneto-caloric study for $x$ = 0.3 (0.7) gives large refrigerant capacity (*RC*) of 330 (250) J/kg at 5 T applied magnetic field. The large *RC* value and two successive magnetic transitions makes these earth abundant-based Mn${}_{3-x}$Fe${}_{x}$Sn_{2} alloys highly promising for magnetic refrigeration in a wide temperature span.