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Contact between a Co∕Pt multilayer and an IrMn film leads to perpendicular exchange bias. The exchange bias field does not depend on the degree of (111) film texture and for Co∕Pt multilayers with IrMn at the bottom it can be enhanced by magnetic field annealing. The perpendicular exchange bias of the Co∕Pt–IrMn system is limited by a misalignment between the Co spins and the film normal, which is due to a negative magnetic anisotropy contribution from the Co∕IrMn interface (KSCo∕IrMn=−0.09mJ∕m2). The insertion of a 3A thick Pt layer at the Co∕IrMn interface maximizes the perpendicular exchange-bias field.

IrMn as exchange-biasing material in systems with perpendicular magnetic anisotropy