qMem Datawrangler

This script processes output of qMem measurement software into an Origin ® compatible *.csv files and matplotlib graphs to quickly visualy analyze data. Odd and even sweep numbers are treated seperately to account for hysteretic or memristive effects.

It also performs the following calculations:

• Absolute values of current / current density (for semi-log plots)
• Memory window (the ratio between the absolute values of odd and even sweeps)
• Differential resistance
• Fowler-Nordheim with variable exponent
• Normalized differential resistance (NDR)
• Statistics on all measured and calculated data (min, max, avg)

Parameters

Calculations made and plots generated by this script are controlled via the config.ini file within the same folder as the main script. The following Parameters can be set:

Files Generated

After processing, csv files are generated and suffixes according to their content are added:

• *_header: The header extracted from the measurement file - including all measurement parameters (e.g. step size, operator, material ID, ..)
• *_all: File with all sweeps or *_stats: File with only the statistical analysis of all sweeps
• *-abs: indicating that only absolute J or I values are recorded
• *_Current _[A] or _Current-density: Indicating either current or current density within the file
• *_fn: Results from Fowler Nordheim calculations (including V-->1/V at x-Position)
• *_mwindow _ {method} where {method} is either "divide" or "subtract"