Investigation of magnetic resonance in RbMnBr3 antiferromagnetics under pressure

The dependence of the antiferromagnetic resonance spectrum in the RbMnBr3noncollinear antiferromagnetic on the mechanical pressure, applied to the sample in different direction, is experimentally studied. It is shown that the incommensurable magnetic phase, existing in the initial system on the account of the regular crystallographic distortions, proves to be sensitive to the pressure, applied along one the sample axes. The drop of the critical field of the transfer to the commensurable phase under pressure. The effect of pressure on the value of the single-axis anisotropy, originating in the crystal basis plane on the account of the orthorhombic distortions. The analysis of the above-enumerated effect is carried out with an account of the sample domain structure