How do oxygen vacancies contribute to coercivity and saturation magnetisation?

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Imad Hussain

I am not sure about the system of materials you are working on.....However, for a particular class of materials (e.g Sr2FeMoO6 double perovskite), the oxygen vacancy weakens the hybridization interaction between the oxygen and transition metals, consequently the double exchange interaction between Fe-O-Mo-O-Fe is reduced. This leads to a decrease in the Curie temperature and magnetization of the material. The attached papers can help you in this direction.

Sadeq H. Lafta

I think you mean ferrite and magnetic ceramic. the deviation about the stoichoemetric oxygen content affect saturation magnetization. Coercievity always is affected by grain size.

Sai Srikanth Arvapalli

Thank you Sadeq sir, can you suggest some papers where the science behind this trend is explained