Remarkable magnetic enhancement of type-M hexaferrite of barium in polystyrene polymer

Abstract

We demonstrate that the promising effect of inclusion of single magnetic-domain type-M hexaferrite of barium (BaM) particles in polystyrene (PS) polymer (BaM/PS weight ratio = 2/1). The results show that the coercivity of BaM particles remarkably increases from 714 to 3772 Oe and remanence increases from 2.07 to 5.41 emu.g−1 when they embedded into PS. Moreover, magnetic coercivity and squareness of the BaM-PS are significantly larger, and is comparable with corresponding values of other BaM-polymer composites. Therefore, BaM-PS composite enforce itself as the modern potential materials with tendency of replacing existing composite materials in several applications.

Functional Magnetic Composites Based on Hexaferrites: Correlation of the Composition, Magnetic and High-Frequency Properties

“…It means a decrease in deviations from the linear dependence of magnetic energy with increasing substitution ratio, which testifies to the hypothesis of a statistical distribution of Ga 3+ cations between different nonequivalent crystallographic positions in the M-type barium hexaferrite structure. The polymer coating on magnetic particles obviously affects the contributions of the surface anisotropy, shape anisotropy and interface anisotropy to the total anisotropy [36,37]. The magnetic parameters of Ba(Fe1-xGax)12O19/epoxy composites are higher than the corresponding parameters of pure Ba(Fe1-xGax)12O19 (0 ≤ x ≤ 0.1) polycrystalline samples, while the shape of MS (x) dependencies remains unchanged.…”

“…It means a decrease in deviations from the linear dependence of magnetic energy with increasing substitution ratio, which testifies to the hypothesis of a statistical distribution of Ga 3+ cations between different nonequivalent crystallographic positions in the M-type barium hexaferrite structure. The polymer coating on magnetic particles obviously affects the contributions of the surface anisotropy, shape anisotropy and interface anisotropy to the total anisotropy [36,37] The magnetization-field dependence for 30 wt.% Ba(Fe 1−x Ga x ) 12 O 19 /epoxy composites is relatively small, which may be due to the prevalence of domain rotation in the high-field region. The relationship between M and H in this region is called the "law of approach to saturation" and is usually written as [38]:…”

Electromagnetic Properties of Carbon Nanotube/BaFe12−xGaxO19/Epoxy Composites with Random and Oriented Filler Distributions

“…It may be concluded that the increase in f res in the case of the 1% CNT/30 wt.% BaFe 12-x Ga x O 19 /epoxy composite is the result of the H a increase and M s decrease observed for 30 wt.% BaFe 12-x Ga x O 19 /epoxy CMs in our previous research [37]; it was shown that the magnetic parameters of 30 wt.% BaFe 12-x Ga x O 19 /epoxy composites are higher than the corresponding parameters of pure BaFe 12-x Ga x O 19 (0 ≤ x ≤ 0.1) polycrystalline samples. It was concluded that the polymer coating on magnetic particles obviously affects the contributions of the surface anisotropy, shape anisotropy, and interface anisotropy to the total anisotropy [38,39]. The slightly higher values of f res for the aligned 1% CNT/30 wt.% BaFe 12-x Ga x O 19 /epoxy composite may be related to the higher value of the magneto-crystalline anisotropy field H a due to a change in the shape anisotropy at the formation of the elongated barium hexaferrite chains under magnetic field alignment [36,40].…”

The role of flash auto-combustion method and Mn doping in improving dielectric and magnetic properties of CoFe2O4

“…In recent years, the ferrites have been known as great practical materials as well as the special class of magnetic compounds [1][2][3][4][5][6][7][8][9][10]. Because of their significant dielectric, magnetic properties, they are used in wide ranges of applications at different fields of technology (energy, refrigeration, and health) [11][12][13][14][15][16][17][18][19].…”