Abstract
The effects of the tensile stress on exchange bias of [Pt/Co/CoO]n multilayer are investigated by depositing the magnetic film onto the ordered curved substrate composed of a polystyrene nanosphere monolayer film. The square ratio of the loop decreases first and increases then with the reduction of tensile stress when the nanosphere size increases. The square ratio and exchange bias field are enhanced significantly when 60 nm polystyrene nanosphere arrays are chosen as the substrate, which is ascribed to the increased interfacial uncompensated antiferromagnetic spins created by the periodical knots between neighbor spheres and the formation of the entire domain wall. In addition, the easy axis of [Pt/Co/CoO]n multilayer is tailored when the CoO sublayer thickness changes, which is due to the gradual development of a tilted anisotropy. When CoO is 1.9 and 2.6 nm, the exchange coupling with tilted magnetic easy axis is obtained in the 45° direction.
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