Temperature-induced sign change of the exchange bias in Fe_(0.82)Zn_(0.18)F_(2)/Co bilayers

摘要

A single crystal, (110)-oriented dilute antiferromagnet (AF) Fe_(0.82)Zn_(0.18)F_(2) film was grown via molecular beam epitaxy on a (110)-MgF_(2) substrate by codepositing FeF_(2) and ZnF_(2), followed by 1.0 nm pure FeF_(2) and 18 nm Co layers. The exchange bias (H_(E)) and coercivity (H_(C)) of the Co film strongly depend on the cooling field (H_(CF)) and temperature. For 0≤H_(CF)0 for T