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Using chemical coprecipitation preparation of p-MgFe2O4 and p-NiFe2O4 magnetic nanoparticles,Then the prepared magnetic particles with an acid and deionized water by mixing in proportion to get different volume fraction of unit ionic magnetic fluid.Finally,two kinds of unit magnetic liquid that the volume fraction is same in a volume ratio of 1∶1 by mixing is to be binary ionic magnetic liquid p-MgFe2O-p-NiFe2O4.