Enhancing the electric, dielectric and magnetic properties of TiNb2O7/ NiFe heterostructures

This work explored a TiNb2O7/NiFe heterostructure prepared by integrating the tape-casting and magnetron sputtering techniques. Using various experimental setups, the TiNb2O7 layer was systematically characterized from the structural, morphological, electrical, and dielectric perspectives. The TiNb2O7 sheets were submitted to polishing processes to improve the surface's quality for future anode integration applications. This surface improvement was tested through the deposition of Ni81Fe19 thin films. For this purpose, electric and magnetic properties were also investigated for the heterostructures. The employed process induces a decrease of around 80 % in the surface roughness, yielding a reduction of around 90 % in the electric resistance. The electric resistance decreases from 4.38 kc2 for the TiNb2O7/NiFe heterostructure with a low level of polishing to around 0.27 kc2 with the highest level of polishing sheet. Similar results were observed for the magnetic properties, in which a drastic decrease of the coercive and saturation fields was observed as the polishing process was realized. While the coercive field for the TiNb2O7/NiFe heterostructure with a low level of polishing was around 13 Oe, for the highest level of polishing sheet, this value decreased to around 4 Oe. The findings demonstrate a promissory route to integrate TiNb2O7 sheets to ferromagnetic layers for future technological battery applications.