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

TL;DR

This study investigates the magnetic properties and magnetocaloric effect of CaMn7O12, revealing a new magnetic transition and presenting the first analysis of its magnetocaloric potential with practical implications.

Contribution

It reports a new magnetic transition at 20 K, analyzes magnetic phase behavior using Arrott plots, and presents the first magnetocaloric effect measurements for CaMn7O12.

Findings

Discovery of a magnetic transition at 20 K from noncollinear to collinear AFM.

Anomaly at 64 K linked to field-induced spin canting.

Magnetocaloric effect with a peak entropy change of 1.3 J/Kg·K.

Abstract

Detailed magnetic studies including magneto-caloric measurements on magnetic multiferroic quadruple perovskite CaMn7O12 are presented. Based on the collective response of Arrott plots and {\Delta}SM (T), a magnetic phase diagram of CaMn7O12 is suggested. A new magnetic transition at TN3 ~20 K where the system changes from noncollinear AFM to collinear AFM is reported. An anomaly observed in both {\Delta}SM (T) and Arrott plots around 64 K has been attributed to high external field induced spin canting leading to change in magnetic order inducing phase transition. Magneto-caloric effect in this material is presented for the first time. The peak value of change in isothermal magnetic entropy is 1.3 J/K-Kg and the value of refrigeration capacity is reported to be 34.5 J/Kg for the field of 7 T.