Effect of Ni and Al substitution on the magnetic properties of Y-type hexaferrite Ba<sub>0.5</sub>Sr<sub>1.5</sub>Zn<sub>0.5</sub>Ni<sub>1.5</sub>Fe<sub>11.92</sub>Al<sub>0.08</sub>O<sub>22</sub> powders
Journal of physics. Conference series