Abstract
The dependence of exchange-bias field (HEB) and coercivity (HC) on the ferromagnetic (FM) layer thickness in CoFe/IrMn and CoFe/FeMn bilayers was investigated. The coercivity of the CoFe/IrMn bilayers is very sensitive to the IrMn (110) structure. Through inserting a thin antiferromagnetic (AFM) FeMn layer into the CoFe/IrMn interface, an obvious change in the coercivity behavior is observed. Our results show that the interfacial magnetic domains play a prominent effect on the exchange-bias field, but a negligible influence on the coercivity behavior, suggesting that the enhanced coercivity in FM/AFM exchange biased system comes from the irreversible spin rotation in the AFM layer near interface.
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