Synthesis, Structures, and Multiferroic Properties of Strontium Hexaferrite Ceramics

Synthesis and multiferroic properties of M-type SrFe12O19 hexaferrite ceramics

“…The remnant polarisation is about 23 lC/cm 2 and the electric coercivity is about 210 kV/m. Similar values of the remnant and maximal polarisations are obtained for M-type hexagonal ferrites AFe 12 O 19 prepared by polymer precursor technology [14][15][16].…”

“…Small addition of Mg or Al also helps to increase the resistivity [8,13,19]. M-type hexaferrite ceramics prepared by polymer precursor technics also have an enhanced resistivity [14][15][16].…”

“…On the other hand, combined large ferroelectricity and strong ferrimagnetism have been observed in pure single-phase hexaferrite ceramics synthesized by a polymer precursor method [14][15][16]. The origin of dual ferroic properties in this case could be related with a geometrical structural transition occurring below the Curie temperature.…”

Dual ferroic properties of hexagonal ferrite ceramics BaFe12O19 and SrFe12O19

“…The success in realizing room temperature multiferroic prop- [18][19][20]. Table 3 compares the ferroelectric properties of BaM and SrM hexaferrites prepared in this work by modified ceramic technique and by polymer precursor technique with sintering temperature of 1200°C.…”

“…All these systems belong to M-type hexaferrites having a collinear ferrimagnetic structure (see review in [22]) so the Dzyaloshinskii-Moriya mechanism could not be responsible for dual ferroic properties. It was proposed that the electrical polarization in this case is ascribed to a geometrical structural transition occurring due to the O-octahedral distortion below the electric Curie temperature [18][19][20][21]. In the present work, a modified ceramic technique was used to sintering BaFe 12 O 19 , PbFe 12 O 19 , and SrFe 12 O 19 M-type hexaferrites with enhanced electrical resistivity in order to investigate their electric and magnetic ordering and ME coupling.…”