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Shape variation under the action of small external fields is a peculiar feature of soft matter. In the present paper we demonstrate a possibility of the analogous shape variation in the solids that combine the properties of antiferro-and ferromagnetic materials and show strong magnetoelastic coupling. The antiferromagnetic subsystem provides a macroscopic deformation of a sample in the external magnetic field while the ferromagnetic component ensures high susceptibility of the domain structure. 75.60.Ch, 46.25.Hf, 75.50.Ee PACS:doi:10.5488/cmp.13.23701 fatcat:yj6mebwo3bhg5itzl7key3tnfe