I am not getting exactly what you want to say .... Gold Nanoparticles having magnetic property or some thing else..... it is possible that first you can synthesize gold nanoparticles by microemulsion method by using surfactant and to that system add Ferric chloride and oxidising species .... then Fe3O4 will cover the gold nanoparticles..... it is a microemulsion method.... So surfactant should be used....
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