Generally for multiferroics sample pellets, we make metals surfaces on both side to make electrodes just like two parallel plates and measure the PE loop. But in case of PE loop of multiferroic thin films, if the area of electrodes of both sides of the film is different, then does the sample show the required characteristics loop?
Dear Subhasri Subudhi,
The surface area of two electrodes must be of same area.
Thanks
N Das
No, it is not necessary that the surfaces of the electrodes are equal.
But the electric field must be perpendicular and uniform between the two electrodes.
For this, the thickness of the film must be very small, compared to the size of the smallest electrode. For example, if the film is 500 nm thick, then the size of the smallest electrode (usually the top electrode) must be greater than 5 µm x 5 µm so that the electric field is uniform (and it is preferable to have larger electrodes, at least 100 µm x 100 µm to limit the parasitic volatges). But the second electrode (usually the one below the film to be measured) can have a much larger size (often the lower electrode covers the whole surface of the sample).
Gilles Poullain
Thank you so much for your answer. It Is really helpful.
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