Multiferroic and magnetoelectronic polarizations in BaFe12O19 system

Microscopic mechanism of ferroelectric properties in barium hexaferrites

“…It should be noted that such values of the remnant polarization are lower than in Ref. [6,7,42] that can be explained by the smaller value of the applied electric field in our case. Rising the electric field on two orders of magnitude should allow to achieve comparable values of the remnant polarization.…”

“…As noted above, ferroelectric properties have already been observed in the initial compound BaF e 12 O 19 [6,42], but the mechanism of their appearance in M-type hexaferrites remains debatable. A discussion of the possible reasons for their occurrence is given below.…”

Temperature induced structural and polarization features in BaFe12O19

“…2, 4, 48–54 that can substantially decrees the leakage current. The issue of the leakage current has been already discussed 55 indicating that the proper sample preparation of BaFe 12 O 19 by using a partially oxygen annealing process to get rid of oxygen vacancies provides a hysteresis loop with the standard shape typical of ferroelectrics. In addition, a space-charge contribution can also affect the shape of the hysteresis loop when noncentrosymmetric charge distribution occurs because of coexistence of inequivalent sites with different charges and inequivalent bonds.…”

Structural phase stabilization via Ba site doping with bivalent Sr, Ca and Zn ions and Fe site doping with trivalent Cr and Ga ions in the BaFe12O19 hexaferrite and its magnetic modification

“…A recent study of BaM hexaferrite showed ferroelectric properties with remnant polarization of 55.7 μC cm −2 and coercivity of 441 kV cm −1 . 21,22 Materials with tunable magnetic parameters and ferroelectric polarization are useful in multi-state storage devices. 23 The main hindrance to studying doping effects in hexaferrites is the complication in obtaining a single-phase system, despite employing different types of synthesis routes with heat treatment in the range 800–1200 °C.…”