Study of the Magnetic Properties of Neodymium and Samarium Iron Borates by the Method of Erbium Spectroscopic Probe

https://doi.org/10.1134/S0030400X23060024

Iron borates NdFe₃(BO₃)₄ and SmFe₃ (BO₃)₄ activated with 1% erbium, with ahuntite structure (space symmetry group R32) were investigated by the method of erbium spectroscopic probe. From an analysis of the temperature dependence of the transmission spectra in the region of the ⁴I_15/2 → ⁴1_13/2 transition in the Er³⁺ ion, it was found that both studied compounds order antiferromagnetically at T_N ≈ 33 K into an easy-plane magnetic structure. No other phase transitions were found.