Spectroscopic and magnetooptical investigations of spin-reorientation phase transition in TbFe3(BO3)4

Abstract

Spectroscopic and magnetooptical investigations of spin-reorientation transition induced by a magnetic field in antiferromagnetic terbium ferroborate TbFe3(BO3)4 were performed. In the phase-transition region, a magnetic intermediate state with a periodic alternation of domains of initial and spin-flopped magnetic phases appears. As a result, a strong light scattering by the crystal takes place. It is shown that the main mechanism of light scattering is related to an appearance of the large Faraday rotation in a high-field magnetic phase. Visual polarization investigations of the domain structure in the intermediate state were carried out. The energy of the interphase boundary between the antiferromagnetic and high-field magnetic phases was calculated. The existence domain of the intermediate magnetic state was determined in the H–T coordinates.

Phase transitions and p–T phase diagram of the multiferroic TbFe3(BO3)4 crystal

“…At the same time, the antiferromagnetic ordering, caused by the interaction with the iron subsystem, also takes place in the terbium subsystem with magnetic moments parallel to the same axis. The spin‐reorientation phase transition of the first order is induced in the terbium ferroborate (H =35 kOe at T = 4.2 K) [11,14,20] . We should mention the work of David Saller et al [21] .…”

“…The spinreorientation phase transition of the first order is induced in the terbium ferroborate (H c =35 kOe at T = 4.2 K). [11,14,20] We should mention the work of David Saller et al. [21] The authors investigated magnetic resonances in TbFe 3 (BO 3 ) 4 multiferroics.…”

Фазовая диаграмма и особенности поведения мягких мод в твердых растворах со структурой хантита TbFe-=SUB=-3-x-=/SUB=-Ga-=SUB=-x-=/SUB=-(BO_3)-=SUB=-4-=/SUB=-

“…В то же время антиферромагнитное упорядочение, вызванное взаимодействием с подсистемой железа, существует также в подсистеме тербия с магнитными моментами, параллельными той же оси. Кроме того, в ферроборате тербия индуцируется спин-переориентационный (магнитный) фазовый переход первого порядка (H c = 35 Oe при 4.2 K) [10,14,21]. Следует упомянуть работу Д. Саллера и др.…”

Magnetooptical Study of Spin-Orientation Phase Transition in NdFe3(BO3)4 Single Crystal

“…It allows the small non-strained sections of single-crystalline plates a few tens of microns in thickness to be selected and studied. In works [6,7], this method was applied for the first time to research the spin-orientation phase transition induced by the magnetic field in a NdFe 3 (BO 3 ) 4 crystal. The results obtained were confirmed by the data of resonance [8] and acoustic [9] studies of the crystal concerned.…”