Investigation of the crystal/magnetic structure, magnetic and optical properties of SrY <sub>x</sub> Nb <sub>x</sub> Fe <sub>12−2x</sub> O <sub>19</sub> (x ≤ 0.05) hexaferrites
M.A. Almessiere, Y. Slimani, H. Güngüneş, Muhammad Nawaz, Fatimah Alahmari, A. Manikandan, A. Baykal
Abstract
Abstract Series of Sr hexaferrites (HFs) co-substituted with Nb 3+ and Y 3+ ions (SrY x Nb x Fe 12−2x O 19 (x ≤ 0.05) were prepared via sol-gel combustion method. In addition to their optical, low temperature, magnetic properties and hyperfine interactions were investigated in detail. X-ray diffraction (XRD) patterns were considered proving both the formation and pureness of products. Mossbauer analysis indicated that the hyperfine field on iron nuclei at all sites decrease with substitution of Y 3+ –Nb 3+ ions into Sr-hexaferrite as a result of changing the magnetic Fe 3+ (5 μ B ) ions by nonmagnetic Y 3+ and Nb 3+ ions. This leads to decreasing of the magnetic super exchange interaction between the ions. Measurements of AC susceptibility and ZFC-FC magnetizations implemented in a range from room temperature (RT) down to around 2 K. The analysis of M FC –M ZFC data proves the ferrimagnetic performance of different prepared HFs in the whole range of 2–325 K and a super-spin glass-like behavior was identified at minimal temperatures. The investigation of AC susceptibility revealed a weakening in the magnetic exchange interactions with the rise in the Nb 3+ and Y 3+ ions ratios.