The M Vs H curves as a function of temperature gives the dependence of the coercitive field Hc with T. The maximum value of Hc is obtained at the lowest temperature and then Hc decrease with increasing T. The blocking temperature TB is atteined when Hc becomes  zero.

You can go for M-H curve at various temperatures, Hc decreases with increasing temperature. This can be co-related with other curves such as  M-T and ZFC-FC curves at different field. 

Thank you Mr. P. Grima Gallardo

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