“…This technology provides an approach to enhance the ER effect via applying an additional magnetic field. Iron particles, [117] iron particles coated with titania, [118] glass spheres coated with nickel and titania, [119] and various ferromagnetic particles (such as magnetite, manganese ferrite, barium ferrite, iron, cobalt, nickel, permalloy, iron nitride) coated with metallic oxides (such as SiO 2 , Al 2 O 3 , TiO 2 , BaO) [120] have been reported to show the EMR effect.…”