Solid phase epitaxy of perpendicular magnetic BaFe12O19 flexible sheets on a mica substrate

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Epitaxial M-type BaFe12O19 flexible sheets, exhibiting RT perpendicular magnetization, were synthesized on mica substrates through the solid phase epitaxy method. The [110] and [001] directions of the BaFe12O19 layer were parallel to the [010] and [001] directions of the mica, respectively. In the synthesis process, amorphous BaFe12O19 films were firstly prepared on Al2O3-buffered mica (001) substrates and then annealed at 800 °C–900 °C in air for single crystallization. During optimization of the synthesis, we found that preparation of the buffer layer and controlling annealing temperature are important for obtaining the epitaxial sheet. The sheets exhibited perpendicular ferrimagnetism with large saturated magnetization (60 Am2 kg−1) and magnetic anisotropy coefficient (2.1 × 105 J m−3) at 300 K, together with flexibility.