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Detailed magnetic studies including magneto-caloric measurements on magneticmultiferroic quadruple perovskite CaMn7O12 are presented. Based on thecollective response of Arrott plots and {\Delta}SM (T), a magnetic phasediagram of CaMn7O12 is suggested. A new magnetic transition at TN3 ~20 K wherethe system changes from noncollinear AFM to collinear AFM is reported. Ananomaly observed in both {\Delta}SM (T) and Arrott plots around 64 K has beenattributed to high external field induced spin canting leading to change inmagnetic order inducing phase transition. Magneto-caloric effect in thismaterial is presented for the first time. The peak value of change inisothermal magnetic entropy is 1.3 J/K-Kg and the value of refrigerationcapacity is reported to be 34.5 J/Kg for the field of 7 T.

Investigation of Arrott plot and magnetocaloric effect in the complex CaMn7O12 perovskite