Exploring the structural and magnetic trends in Ba_0.9Sm_0.1Fe_12−xAl_xO₁₉ M-type Hexaferrites

Abstract

Current study describes the structural and magnetic properties of Ba0.9Sm0.1Fe12-xAlxO19 (x=0.0, 0.5, 1.0, 2.0, 3.0) M-type hexaferrites. Conventional ceramic route was implied to prepare all the nominal samples. Morphological analysis suggested the non-presence of secondary phases as well as formation of the hexaferrites material. X-ray Diffraction technique was used for structural analysis from which microstructural parameters are calculated and discussed. Magnetic properties are measured at room temperature. The saturation magnetization (Ms) and coercivity (Hc) values shows a cyclic and converse trend for synthesized samples. Firstly, a decrease in Ms and increase in Hc was observed up to intermediate dopant incorporation, and becomes converse for higher doping levels. The maximum coercivity and minimum magnetization is observed for Ba0.9Sm0.1Fe11Al1O19. The c/a and Mr/Ms ratio suggest the formation of perfect M-type hexaferrites. This work suggests that synthesized material is a good option for magnetic applications e.g., transformer and inductor cores, microwave devices, recording heads, and magnetic shielding.

Structural and magnetic properties of BaFe9.95Al2Mg0.05O19tuned through sintering temperature

“…The results showed that there were no secondary phases in the material and that the hexagonal shape of the particles was evident in the micrographs. The SEM images in figure 2 was also confirmed that the samples were homogenously and uniformly distributed [18,30]. Pores present in the images showed the removal of PVA binder.…”

“…Various research studies have been carried out to enhance the hard magnetic properties of M-type hexaferrites by substituting alternative cations for those found in Ba or Fe sites [1,3,10,15,18]. For instance, the research conducted on the BaFe 12−x Al x O 19 using a sol-gel self-combustion method showed the coercivity of the substance reached a high of 13.7 kOe.…”

Effect of ferromagnetic cobalt on characteristics of coercive Aluminium substituted BaFe11.5Al0.5O19 hexaferrites

“…The results demonstrate that the prepared material is significant for magnetic purposes, including spintronics, magnetic filters, and recording media. The magnetic moment per formula unit is determined using the formula below for Bohr's magnetron [34].…”

“…Cell refinement analysis of the synthesized samples of M-type BaFe 11.5−x Al 0.5 Co x O 19 (x = 0.00, 0.5, 1.0, 1.5, and 2.0) hexaferrites nanoparticles was performed by Celref software [10,45,46]. Lattice parameters of all the produced samples were listed in table 1.…”

“…Numerous research teams have developed these ferrites and investigated how dopants affect their magnetic characteristics. For Ba sites, metal ions like La, Sm, and Nd with ionic radii significantly more significant than the Fe ionic radius can increase the coercive field and magnetization [34][35][36]. Recent studies have demonstrated that M-type hexaferrites with rare earth (Re) metal substitutions have better magnetic characteristics.…”