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arXiv · 2610.00534

Near-infrared magnetic linear and non-reciprocal directional dichroism in the chiral antiferromagnet SmFe3(BO3)4

B. Beke·B. Szász·I. A. Gudim·D. Szaller·S. Bordács
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Abstract

We investigated the influence of antiferromagnetic (AFM) order on the near-infrared optical re- sponse of SmFe3(BO3)4 by polarization-resolved, magneto-optical spectroscopy. Below the Néel temperature, we observed pronounced magnetic linear dichroism at the 4f -4f transitions of Sm3+. By rotating the order parameter of the easy-plane AFM ground state using magnetic fields, we demonstrated the magnetic field control of linear dichroism, and deduced polarization selection rules. In addition, we detected non-reciprocal directional dichroism for several 4f -4f transitions. The non-reciprocal absorption appears in the symmetry-allowed toroidal geometry when the in- plane magnetic field is normal to one of the two-fold rotation axes. These results indicate a strong interference between electric- and magnetic-dipole excitations for transitions showing non-reciprocal absorption. The observed optical anisotropies provide a promising path to detect the in-plane orien- tation of the AFM order, enabling imaging and time-resolved studies of the AFM order parameter in rare-earth ferroborates.

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B. Beke, B. Szász, I. A. Gudim, D. Szaller, S. Bordács. 2026-09-30. Near-infrared magnetic linear and non-reciprocal directional dichroism in the chiral antiferromagnet SmFe3(BO3)4. https://arxiv.org/abs/2610.00534

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