If your particles in the mixture are at a distance exceeding the threshold of magnetostatic interaction (about 5 particle diameters), then they can be considered non-interacting, and the magnetization values on the M-H curve should be multiplied by 0.4. If the dependence curve is built in a Gaussian system (Gs-Oe), then to obtain the values of B, it is enough to add the field strength: B= H+4piM. In the case of particle interaction, the hysteresis loop is likely to become wider. The coercivity of Hc will increase. It should be taken into account that the magnetization of the powder (in Gs) may be lower than the magnetization of the particle material due to a lower value of the bulk density than the particle density. Therefore, to obtain magnetization in Gs, it is necessary to divide the value of the magnetic moment of the sample on the initial curve of the magnetometer (in emu units) by the mass of the powder (specific magnetization) and multiply by the density (this may be the X-ray theoretical calculated crystal density) of the substance of the particles themselves.

https://www.txemm.com/services/material-characterization/magnetic-hysteresis

check