Reliability of normal-state current-voltage characteristics as an indicator of tunnel-junction barrier quality

@inproceedings{Jnssonkerman2000ReliabilityON,
  title={Reliability of normal-state current-voltage characteristics as an indicator of tunnel-junction barrier quality},
  author={B. J. J{\"o}nsson-{\AA}kerman and Roberto Escudero and Chris Leighton and S. Kim and Ivan K. Schuller and David Alan Rabson},
  year={2000}
}
We demonstrate that one of the most commonly used criteria to ascertain that tunneling is the dominant conduction mechanism in magnetic tunnel junctions—fits of current‐voltage (I ‐V) data—is far from reliable. Using a superconducting electrode and measuring the differential conductance below T c , we divide samples into junctions with an integral barrier and junctions having metallic shorts through the barrier. Despite the clear difference in barrier quality, equally reasonable fits to the I… CONTINUE READING

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