Kink in M-H plot of BaM recorded at Room temperature?

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María De Los Ángeles Urbano Peña

This kink is very similar to the phenomenon known as wasp-waist hysteresis. In this case, this phenomenon is explained by two reasons. The first is due to the mixture of grain sizes in the sample. If your sample contains hematite, the second reason could be for a difference between the coercivity of the hard magnetic phase (hexaferrite) and the soft magnetic phase (hematite).

I recommend you this article (https://doi.org/10.1029/95JB00672) in which I have found information about this phenomenon that may help you.

Ashraf M. Semaida

This is related to the exchange coupling between hard and soft phases.

For more information, this paper will help you

Article Magnetization performance of hard/soft Nd9.6Fe80.3Zr3.7B6.4/...