How to check the quality of MgO for magnetic tunnel junction?

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Muhammad Shahbaz Anwar

I would check it under AFM using contact mode to see the density of pinholes.

Santosh M. Bobade

DO AFM for checking out the microstructure. Make sure that it not porous. Secondly, check the breakdown field of MgO. If you apply the electric field higher than that then film resistance becomes very small and it short circuit the device. In that case, you have to increase the thickness of MgO or lower applied voltage. Most important is film porosity must be minimum. Check this out. I hope it will solve your problem.