Synthesis and magnetic properties of (Eu-Ni) substituted Y-type hexaferrite by surfactant assisted co-precipitation method

A series of (Eu-Ni) substituted Y-type hexaferrite with composition Sr2Co(2-x)NixEuyFe(12-y)O22 (x=0.01, Y=0.0-0.1) were prepared by the surfactant assisted co-precipitation method. The present samples were sintered at 1050 degrees C for 8 h. The shape of the particles is plate-like which is very advantageous for various applications and the grain size varies from 73 to 269 nm. The values of saturation magnetization (M-s), remanent magnetization (M-r) and magnetic moment (n(B)) were found to decrease which are attributed to the weakening of super exchange interactions. The values of in-plane Squareness ratios (M-r /M-s) ranging from 0.41 to 0.65 whereas in case of out of plane measurement it varies from 0.30 to 0.62. The investigated samples can be used in perpendicular recording media (PRM) due to high value of coercivity 2300 Oe which is analogous to the those of M-type and W-type hard magnetic. (C) 2015 Elsevier B.V. All rights reserved.