Enhanced microwave absorption of Fe flakes with magnesium ferrite cladding

Surface cladding of Magnesium ferrite (MgFe2O4) was found to be helpful for effectively decreasing the permittivity of Fe flakes. So the electromagnetic impedance matching was improved, resulting in a good microwave absorption. Careful characterizations showed that the giant decreases of permittivity were ascribed to the high resistivity of surface due to the MgFe2O4 cladding. A high frequency microwave absorption property with thin absorber thickness was obtained for the Fe flakes with 10 wt% MgFe2O4.

► The electromagnetic wave absorption of Fe flakes was improved by MgFe2O4 cladding.
► The decreased permittivity causes a better electromagnetic impedance matching.
► A high frequency microwave absorption property was obtained for the Fe flakes.