In this work, effects of exchange coupling of soft magnetic layer on switching field and magnetization reversal behaviour of CoPt–SiO2(soft)/CoPt–SiO2(hard) exchange coupled media were investigated. With increasing the thickness of the soft layer, both the coercivity and magnetization squareness of composite media decreased. Soft layer thickness 4 nm and below was more effective to significantly reduce the switching field than that above 4 nm. More incoherent switching behavior was observed with increasing soft layer thickness.
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