Cr-doped and undoped β-FeSi2 thin films were deposited on (001) and (111) Si substrates by molecular beam epitaxy. Single crystals were grown by the chemical vapor transport technique. In thin films we found a significant substrate influence on the Hall voltage at room temperature which was strongly reduced at lower temperatures. In Cr-doped samples a transition between defect-band conduction and valence-band conduction was observed in the temperature range 50–100 K. The behavior of the mobility curves μ(T) suggests that defect-band conduction dominates up to near room temperature in nominally undoped thin films. Below a sample-dependent temperature, being not higher than 150 K, often a nonlinear dependence of the Hall effect on the magnetic field was found, sometimes accompanied by pronounced hysteresis behavior. It is shown that this behavior is rather related to microinhomogeneities than to a magnetic phase transition.

Hall effect and resistivity of β-FeSi2 thin films and single crystals

Deep level transient spectroscopy is used to study the segregation of Fe from crystalline Si to an Al:Si liquid at its surface, which is the basic mechanism of aluminum gettering used in silicon photovoltaics. The measured segregation coefficient is smaller than estimates from the binary Fe:Si and Al:Fe phase diagrams. This apparent discrepancy originates from the ternary character of the system where the solubility of Fe in Si in equilibrium with the Al-doped α-FeSi2 has to be taken as a reference. Our data suggest that this solubility exceeds that in the binary Fe:Si system by two orders of magnitude.

Aluminum gettering of iron in silicon as a problem of the ternary phase diagram

Since its observation in 1985 nuclear resonant scattering of synchrotron radiation has become an excellent tool to study hyperfine interactions as well as dynamical effects in solids. It combines the advantages of both local probe experiments and scattering techniques and gives valuable information on magnetic structures in case of NFS experiments and of the density of phonon states in case of NIS experiments. Experiments benefit from the outstanding beam quality of 3rd generation synchrotron radiation sources, as the small beam size and divergence.

Nuclear Resonant Scattering of Synchrotron Radiation

The powder samples of (x = 4, 5 and 6) alloys have been measured by means of magnetization, Mossbauer effect, x-ray and neutron diffraction techniques in the temperature range 15 - 400 K Both neutron and x-ray diffraction experiments showed that the positions f in all samples are occupied by iron, while the iron atoms in the samples with x = 5 and 6 locate also at j sites A little f - j disorder exists in  The paper shows a change of the magnetic structure with an increase of iron content The magnetic moments lie in a basal a - b plane Iron atoms in alloy order antiferromagnetically and alloys exhibit in general a ferromagnetic behaviour However a detailed distribution of magnetic moments among different sites could not be determined unambiguously from the neutron data only Nevertheless, combining information from neutron and Mossbauer experiments, one can infer that the ordering among iron atoms must be non-collinear A magnetic ordering among uranium atoms has been found in only Low-temperature thermal expansion varies nonlinearly with temperature and in all samples is negligible at low temperatures

The crystal and magnetic structures of intermetallic compounds

Anomalous hall effect in beta -fesi2

A single line source of linearly polarized radiation in a conventional Mossbauer setup working at room temperature with 57 Co in Cr matrix was constructed. The ordered Fe 3 Si was used as a filter. The estimated degree of polarization of the source depends on the preparation and thickness of the polarizer. The best polarization degree (92 ± 8)% was achieved. The measurements with polarized radiation lead to significant simplification of the complex spectra and allow to study components arising from various polarizations separately. In particular, it is possible to extract Δ m  = (1, −1) and Δ m  = 0 transitions by use of a linearly polarized beam. Moreover polarized beam can be used for determination of texture parameters related to spatial arrangements of spins in the plane perpendicular to the radiation beam. Such parameters are not easily measurable by other methods. The Mossbauer spectra of invar Fe 65 Ni 35 measured by monochromatic linearly polarized radiation are shown as an example.

A single line circularly polarised source for Mössbauer spectroscopy

Results of X-ray diffraction, magnetic susceptibility and Mossbauer measurements are presented for FeSi 2− x Al x with x = 0 up to 0.06. Almost pure β-FeSi 2 was obtained with crystallite size 1–10 μm and with traces of the FeSi phase. The FeSi phase is created in the initial stage of crystallization in the form of dendrites. The α-FeSi 2 phase was not detected in the annealed alloy with x = 0. Substitution of Si by Al causes appearance of the α-FeSi 2 phase which is visible particularly clear as an additional component in Mossbauer spectra. A large maximum of the low temperature susceptibility was observed between x = 0 and x = 0.040. The maximum is interpreted as the result of the enhancement of the susceptibility in the β-FeSi 2 phase doped with Al.

Magnetic and Mössbauer investigation of FeSi2−xAlx

Hyperfine fields in ordered Pt3MnxFe1−x

Some properties of partially ordered Pt3Mn0.9Fe0.1 studied by Mössbauer spectroscopy

Hyperfine interactions in amorphous Co70−xNixFe5Si15B10 studied by the Mössbauer technique

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