We conducted magnetic and transport measurements on two Ba 2FeMoO6 double perovskite samples prepared by wet chemistry and solid-state reaction methods, respectively. The one synthesized by the latter is in the form of Isotropie grains. The "bulrush-like" Ba2FeMoO6 sample fabricated by wet chemistry is high in aspect ratio and Fe/Mo ordering. Utilizing the high shape anisotropy of the sample, we obtained a material with electric anisotropy where the long axis of the sample is almost parallel to the plane of the pellet. With carrier transport perpendicular to the plane, there was an appreciable increase in room-temperature tunneling magnetoresistance (TMR) response (from 22% to 31% at 10 kOe) while the concentration of Fe/Mo disorder remained unchanged. Experimental results indicate that the TMR value could be greatly enhanced by adjusting the nature and amount of grain boundary (GB) insulating barriers.
Scopus Subject Areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering
- Magnetic materials
- Oxygen compounds