Electron magnetic resonance of iron-gallium borate single crystals

Kira Seleznyova (1) , Mark Strugatsky (1) , Sergey Yagupov (1) , Yuliya Mogilenec (1) , Alexey Drovosekov (2) , Natalia Kreines (2) , Patrick Rosa (3) , Janis Kliava (4)

1 Physics and Technology Institute
2 Kapitza Institute for Physical Problems [Moscow]
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
4 LOMA - Laboratoire Ondes et Matière d'Aquitaine

Electron magnetic resonance (EMR) studies of iron-gallium borate, FexGa1−xBO3, single crystals have been carried out in the frequency range ca. 8–38 GHz in magnetizing fields up to 10 kOe and the temperature range of 4–310 K. With decreasing x in the range of 0.34≤x≤1, the EMR spectra show a gradual passage from a low-frequency antiferromagnetic resonance (AFMR) mode at x = 1 toward a coexistence of AFMR and cluster magnetic resonance arising, respectively, from completely and partially magnetically ordered crystal regions. Temperature and concentration dependences of magnetic characteristics of iron-gallium borates, namely, the Néel temperature, the Dzyaloshinskii–Moriya field, and the isotropic energy gap, have been determined by means of AFMR. In contrast to unmixed FeBO3, FexGa1−xBO3 crystals with 0.34≤x≤0.85 show anomalous nonmonotonic temperature dependences of the Dzyaloshinskii–Moriya field with a maximum well below the Néel temperature suggesting the occurrence of another magnetic transition in this temperature range.

Domaines: Matériaux; Electromagnétisme

Kira Seleznyova, Mark Strugatsky, Sergey Yagupov, Yuliya Mogilenec, Alexey Drovosekov, et al.. Electron magnetic resonance of iron-gallium borate single crystals. Journal of Applied Physics, 2019, 125 (22), 223905 (8 p.). ⟨10.1063/1.5095753⟩. ⟨hal-02176351⟩