A flux
growth technique for synthesizing FeBO3 single crystals
of high structural perfection was developed. The high structural quality
of the synthesized FeBO3 crystals was confirmed by means
of double-crystal X-ray diffraction analysis both in Laue and Bragg
geometries. The diffraction rocking curves taken locally and integrally
over the surface are in excellent agreement with the calculated curves.
Some macrodefects were revealed by X-ray topography in the crystal
volume. However, the local defects do not prevent the use of defect-free
regions of the crystal for synchrotron Mössbauer experiments.
We report the first successful synthesis of iron borate films. FeBO 3 films on GaBO 3 single crystal sub strates have been prepared by a liquid phase epitaxy route. In order to determine optimal crystallization regimes, a series of experiments has been carried out. Electron microscope studies have allowed mon itoring different phases of the film formation. The compositions of the film and of the substrate have been determined by energy dispersive spectroscopy. X ray diffraction analysis has allowed an accurate determination of a mismatch between the lattice parameters of the film and of the substrate. Electron magnetic resonance studies of the FeBO 3 film confirm the existence of magnetic ordering. The values of the effective Dzyaloshinskii field as well as the Néel temperature are in good accordance with those previously determined for FeBO 3 single crystal.
Electron magnetic resonance (EMR) studies of iron gallium borate, Fe x Ga 1−x BO 3 , 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 FeBO 3 , Fe x Ga 1−x BO 3 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.
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