This study offers an explanation for the occurrence of magnetization exchange bias in antiferromagnets with ferromagnetic inclusions during pre-cooling the system in a magnetic field. The ferromagnetic (FM) subsystem ordered in this field at the Néel temperature leads to an inhomogeneous state of the antiferromagnetic (AFM) matrix with the finite mean effective field at the FM/AFM interface. This field causes exchange bias in the dependence M = M(H) during further remagnetization of the heterogeneous system. To describe the proposed scenario for such an effect, a simple model of a two-dimensional system with round inclusions of the FM phase was considered. Using numerical calculations and previously obtained analytical results, the study determines magnetization dependencies on the external field, which qualitatively explains the features of exchange bias in experimentally studied heterogeneous systems.
Bibliographical noteCopyright © 2018 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Exchange bias effect in antiferromagnets containing ferromagnetic clusters
M. L. Pankratova1 and A. S. Kovalev2,3,a)
Low Temperature Physics 2018 44:11, 1161-1167 and may be found at https://doi.org/10.1063/1.5060970
Funding: The project is funded by the European Commission
under Horizon 2020’s Marie Skłodowska-Curie Actions
scheme (Grant No. 645660).