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The magnetic behavior of Fe lines on top of a continuous FeF 2 antiferromagnetic layer was investigated as a function of the orientation of the lines with respect to the applied magnetic field and a unidirectional anisotropy established by field cooling. The orientational dependence of the asymmetric loop shift, called exchange bias, shows that the competition between shape and unidirectional anisotropies modifies the exchange bias and the coercivity. Remarkably, in certain cases, exchange biasdoi:10.1103/physrevb.67.220406 fatcat:ojr57ktuzffnrmcwbagde6sbwi