Electron magnetic resonance of iron-gallium borate single crystals

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 gra...

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Bibliographic Details
Published in:Journal of applied physics 2019-06, Vol.125 (22)
Main Authors: Seleznyova, Kira, Strugatsky, Mark, Yagupov, Sergey, Mogilenec, Yuliya, Drovosekov, Alexey, Kreines, Natalia, Rosa, Patrick, Kliava, Janis
Format: Article
Language:English
Subjects:
Antiferromagnetism
Applied physics
Borates
Chemical Sciences
Electromagnetism
Energy gap
Engineering Sciences
Frequency ranges
Gallium
Iron
Magnetic properties
Magnetic resonance
Magnetic transitions
Material chemistry
Single crystals
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Summary: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.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5095753