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I don't recognize hysteresis on presented illustration. How did you obtain this plot? What is the independent (controlled) variable and what (and how) is measured/recorded? Isn't this graph a the result of poor electrical contacts somewhere in the instrument?
It is obtained from PE loop tracer(NPL Delhi), given parameter is drive voltage with variation of frequency. I did silver paste coating to make contact and i check continuity too,also did functionalization of graphite by sulfuric acid and nitric acid.
A single PE loop is the result of an experiment when a single cycle of exciting field is used. Basically you should obtain a single closed curve. It may happen that the curve is not closed if the changes of exciting field are too fast. The outcome of the experiment may also depend on whether the sweep of exciting field is piecewise linear or sinusoidal. Yet simple repeating of the measurement may produce different result unless you guarantee that the initial state of the sample is always the same. Repeating the same cycle again and again may produce "wandering" loop, until "steady state" is reached. Hysteresis has its memory, to say it shortly. All this is nicely described in the following paper:
The anhysteretic polarisation of ferroelectrics
B Kaeswurm, V Segouin, L Daniel and K G Webber
2018 J. Phys. D: Appl. Phys. 51 075305
https://doi.org/10.1088/1361-6463/aaa698
Don't be scared by the word 'anhysteretic' in its headline!
Hope it helps.
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