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1

Numerical models for the evaluation of natural vibration frequencies of thermo-modernized building walls

100%

Kuźniar K., Zając M., Kuźniar K., Zając M.

Archives of Civil Engineering

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2018

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vol. 64

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issue 4-I

2

Comparative Analysis of Experimental and Theoretical Zero-Field Splitting and Zeeman Electronic Parameters for Fe²⁺ Ions in FeX₂·4H₂O (X = F, Cl, Br, I) and [Fe(H₂O)₆](NH₄)₂(SO₄)₂

89%

Zając M., Rudowicz C.

Acta Physica Polonica A

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2017

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vol. 132

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issue 1

19-23

EN

Spectroscopic and magnetic properties of Fe²⁺ (3d⁶; S=2) ions at orthorhombic sites in FeX₂·4H₂O (X = F, Cl, Br, I) crystals are compared with those in [Fe(H₂O)₆](NH₄)₂(SO₄)₂ (FASH). The microscopic spin Hamiltonian modeling utilizing the package MSH/VBA enables prediction of the zero-field splitting parameters and the Zeeman electronic ones. Wide ranges of values of the microscopic parameters, i.e. the spin-orbit (λ), spin-spin (ρ) coupling constants, and the crystal-field (ligand-field) energy levels (Δp_{i}) within the ⁵D multiplet are considered to establish the dependence of the zero-field splitting parameters b_{k}^{q} (in the Stevens notation) and the Zeeman factors g_{i} on λ, ρ, and Δp_{i}. By matching the theoretical spin Hamiltonian parameters and the experimental ones measured by EMR, the suitable values of λ, ρ, and Δp_{i} are determined. The novel aspect is prediction of the fourth-rank zero-field splitting parameters and the ρ (spin-spin)-related contributions, not considered in previous studies. The MSH predictions provide guidance for high-magnetic field and high-frequency EMR measurements.

3

Interface Properties of Single and Bi-Layer Fe_3O_4 Films Grown on MgO(001) Studied by RBS and Channeling Experiments

63%

Kim-Ngan N., Balogh A., Brötz J., Zając M., Korecki J.

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issue 4

570-575

EN

Series of Fe_3O_4/MgO(001) and Fe_3O_4/Fe/MgO(001) films (single- and bi-layer films, respectively) with a total layer thickness in the range of 20 ÷ 150 nm were investigated by the Rutherford backscattering spectrometry (2 MeV He^{+} ion beam), by the Rutherford backscattering spectrometry channeling experiments (1.5 MeV He^{+} ion beam). Depending on the layer thickness of each layer and the film geometry, a single Fe peak and/or a double-anomaly feature was revealed in the Rutherford backscattering spectra. For all films no magnesium presence in the surface layer was observed. For both single- and bi-layer films with a total layer thickness less than 60 nm only one minimum was observed in the channeling curves, while a double minimum was revealed for the bi-layer films with a larger thickness. X-ray reflectometry measurements have revealed that the film density is the same as that of the bulk one.

4

The influence of non-specific anti-pruritus treatment with cyclosporine A on transepidermal water loss (TEWL) in natural atopic dermatitis in dogs

63%

Zając M., Szczepanik M., Wilkołek P., Adamek Ł., Pomorski Z.

Polish Journal of Veterinary Sciences

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2015

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issue 2

5

Observation of Magnetic Anisotropy in Bulk GaMnN:Mg Crystals

55%

Gosk J., Zając M., Kamińska M., Twardowski A., Grzegory I., Boć M., Porowski S.

Acta Physica Polonica A

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2003

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vol. 103

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issue 6

665-669

EN

Magnetic properties of bulk wurtzite n-type GaMnN and highly resistive GaMnN:Mg monocrystals were studied for the magnetic field applied parallel and perpendicular to the crystal hexagonal c-axis. Magnetization of both types of samples reveals paramagnetic behavior. However, for n-type GaMnN isotropic magnetization was observed which is in agreement with Mn d^5 configuration. On the other hand, GaMnN co-doped with Mg shows large magnetic anisotropy which suggests Mn to be in nonspherical d^4 or d^3 configuration.

6

Magnetic Properties of Fe_3O_4 Films on Fe(001)

46%

Zając M., Aernout D., Freindl K., Matlak K., Spiridis N., Ślęzak M., Ślęzak T., Korecki J.

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EN

We investigated the magnetic properties of ultrathin magnetite films deposited directly on MgO(001) and on a Fe(001) buffer layer. In both cases the magnetite surface structure could be identified using low energy electron diffraction. The conversion electron MÖssbauer spectroscopy measurements proved that, for magnetite films deposited on the Fe buffer, superparamagnetic relaxation was strongly suppressed. The effect of a Fe overlayer on the magnetite film grown directly on MgO is considerably weaker. Longitudinal Kerr magnetometry indicated the presence of the ferromagnetic interfacial coupling between Fe and magnetite films. We conclude that the density of antiphase boundaries for films grown on the Fe buffer is lower than that of Fe_3O_4/MgO films.

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