Thin films sputtered from Ba2NdFeNb4O15 multiferroic targets on BaFe12O19 coated substrates

• Synthesis of Ba2NdFeNb4O15/BaFe12O19 (BaM) heterostructures by RF magnetron sputtering.
• Growth of TTB layer were retained regardless of the underlayer (Pt bottom electrode or BaM).
• Dielectric and magnetic properties were obtained from the Pt/TTB/BaM/Pt stacks.

Ba2NdFeNb4O15 tetragonal tungsten bronze (TTB)/BaFe12O19 (BaM) hexaferrite bilayers have been grown by RF magnetron sputtering on Pt/TiO2/SiO2/Si (PtS) substrates. The BaM layer is textured along (0 0 1) while the TTB layer is multioriented regardless of the PtS or BaM/PtS substrate. Dielectric properties of TTB films are similar to those of bulk, i.e., ε ∼ 150 and a magnetic hysteresis loop is obtained from TTB/BaM bilayers, thanks to the BaM component. This demonstrates the possibility of transferring to 2 dimensional structures the composite multiferroic system TTB/BaM previously identified in 3 dimensional bulk ceramics.

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