Fabrication of Ni2+ and Dy3+ substituted Y-Type nanohexaferrites: A study of structural and magnetic properties

A series of the Y-type hexaferrites having chemical composition Sr2-xDyxCo2NiyFe12-yO22 (x = 0.0, 0.01, 0.02, 0.03, 0.04 and y = 0.0, 0.1, 0.2, 0.3, 0.4) were fabricated with doping of Dy3+ and Ni2+. XRD patterns confirm the formation of a single-phase hexagonal structure along with some impurity phases. FESEM and TEM analysis shows the formation of agglomerated magnetic nanoparticles. M - H loops obtained from VSM observations were used to study the magnetic parameters viz. saturation magnetization (M-s = 34.28-43.30 emu/g), remanence (M-r = 1.08-11.60 emu/g) and coercivity (H-c = 33.98-246.05 O-e), which were found to increase with an increase in Dy3+/Ni2+ substituents. The synthesized materials with excellent structural and magnetic properties are promising candidates for high-frequency applications.