Impact of samarium on magnetic and optoelectronic properties of magnesium-based MgSm2X4 (X = S and Se) spinels for spintronics. oleh Nasir Rahman, Ahmed Azzouz-Rached, Mudasser Husain, Bashar M Al-Khamiseh, Khmael M Abualnaja, Ghaida Alosaimi, Vineet Tirth, Hassan Alqahtani, Ali Algahtani, Tawfiq Al-Mughanam, Soufyane Belhachi