Study of the magnetic properties of neodymium and samarium iron borates by the method of erbium spectroscopic probe
Chukalina E. P. 1, Jablunovskis A. 2, Gudim I. A. 3
1Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, Russia
2Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Moscow Region, Russia
3Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Email: echukalina@isan.troitsk.ru, yablunovskii@phystech.edu, irinagudim@mail.ru

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Iron borates NdFe3(BO3)4 and SmFe3(BO3)4 activated with 1% erbium, with a huntite 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 4I15/2-> 4I13/2 transition in the Er3+ ion, it was found that both studied compounds order antiferromagnetically at TN~ 33 K into an easy-plane magnetic structure. No other phase transitions were found. Keywords: Multiferroics, optical spectroscopy, crystals with rare earths, Kramers ions.
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