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The effect of interface roughness of ferromagnetic and antiferromagneticlayers on exchange bias is still not well understood. In this report we haveinvestigated the effect of surface roughness in (111)-orientedantiferromagnetic CoO films on exchange bias with ferromagnetic Fe grown ontop. The surface roughness is controlled at the atomic scale, over a rangebelow ~ 0.35 nm, by varying layer thickness of the CoO films. It is observedthat both exchange bias field ($H_{E}$) and coercivity ($H_{C}$) extensivelydepend on the atomic scale roughness of the CoO (111) at the interface with Fefilm. An opposite dependence of $H_{E}$ and $H_{C}$ on interface roughness wasfound, which was ascribed to partially compensated spin states induced by theatomic roughness at the fully uncompensated CoO (111) surfaces and wascorroborated using the Monte Carlo simulations. Moreover, the onset temperaturefor $H_{C}$ is found to be up to ~ 80 K below the blocking temperature($T_{B}$) and the temperature dependence of $H_{C}$ follows the power law witha critical exponent equal to one, which indicates that, in this system, $H_{C}$is more of an interface-related property than $H_{E}$.

Influence of Atomic Roughness at The Uncompensated Fe/CoO (111) Interface on Exchange Bias Effect