Co-substitution of zirconium and neodymium on hyperfine interactions and AC susceptibility of SrFe12O19 nanohexaferrites

Abstract

This study presents the influence of Zn and Nd co-substitution on structure, morphology, AC suscepti-bility and ZFC-FC magnetizations of Sr nanohexaferrites (NHFs), SrFe12xðZn;NdÞxO19(0.0 x 1.0),which was produced by sol-gel approach. XRD powder patterns, scanning electron microscopy (SEM) andhigh-resolution transmission electron spectroscopy (HR-TEM) approve the synthesis of Sr M-type hex-aferrite. Mossbauer spectra show that Zn2þions occupy 2b and 4f1sites while Nd3þions locate at 2a,4f2and 12ksites. The magnetic properties of the produced Sr-NHFs were investigated also by ZFC-FCmagnetizations and AC susceptibility. According to theMFC-MZFCresults (between 2 and 400 K), noblocking temperature was detected which indicates the ferromagnetic (FM) behavior of NHFs. At lowertemperatures, a super-spin glass like behavior is discerned. The AC susceptibility indicates that themagnetic interactions are improved due to the inclusion of low content (x¼0.1) of Nd3þand Zn2þionsinto the Sr-NHFs. However, with further increasing the Nd3þand Zn2þcontents (x¼0.9), the magneticinteractions are weakened.