What can be the reason for ZFC magnetization found to be higher than the FC magnetization below Tc?

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Sergei Sergeenkov

The difference between FC and ZFC magnetizations M_ir=M_FC-M_ZFC always measures the irreversible properties of the sample. The situation when M_ir0. Usually, MS contribution is a result of structural martensitic transformation, which can significantly modify the initial FM phase (like, e.g., in manganites, see the attached paper).

Keka R. Chakraborty

This phenomena can happen in a ferrimagnetic structure where the magnitude of negative component of magnetization is more than that of the positive component of magnetization.

Here we go again. Benedict, are you satisfied with the answers or you still have doubts? Please share if you do.