The presence of magnetic impurities in the antiferromagnet can account for some ferromagnetic hysteresis behavior observed in exchange bias systems. We show theoretically that such impurities can modify domain-wall formation in the antiferromagnet, which under certain conditions can give rise to coercivity enhancement and asymmetric hysteresis. The linear dynamics of the ferromagnet/antiferromagnet structure in the presence of impurities is also presented. (C) 2004 Elsevier B.V. All rights reserved.
Kim, J., & Stamps, R. (2005). Hysteresis from antiferromagnet domain-wall processes in exchange biased systems. Journal of Magnetism and Magnetic Materials, 286, 233-237. https://doi.org/10.1016/j.jmmm.2004.09.070