Researchers from Brown University in collaboration with researchers from Japan developed a way to induce an inverted magnetocapacitance effect - this is a new phenomenon that could benefit future spintronics devices. The researchers say that Magnetocapcitos could be useful to make magnetic sensors and adding an inverse effect may allow for greater design freedom.

The crystal structure of Fe3O4 and Fe electrodes

To achieve this effect, the researchers used different materials to build a quantum tunneling junction. The image above shows two electrodes - made from Fe3O4 and Fe. The patterns indicate that Fe3O4 has the inverse spinel structure with the same crystal orientation of the MgO substrate, while Fe takes polycrystalline structure.