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1
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Electronic Structure and X-Ray Magnetic Circular Dichroism in Sm-Doped Bi₂Se₃

100%
Antonov V., Bekenov L., Uba S., Ernst A.
Acta Physica Polonica A
|
2018
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vol. 133
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issue 3
453-455
EN
We studied the structural, electronic, and magnetic properties of Sm-doped Bi₂Se₃ using a GGA approximation in a frame of the fully relativistic spin-polarized Dirac linear muffin-tin orbital band-structure method. The X-ray absorption spectra (XAS) and X-ray magnetic circular dichroism at the Sm M_{4,5} edges were investigated theoretically from first principles. The calculated results are in good agreement with experimental data. The complex fine structure of the Sm M_{4,5} XAS in Sm-doped Bi₂Se₃ was found to be not compatible with a pure Sm³⁺ valency state. The interpretation demands mixed valent states.
2
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Ultrafast Magneto-Optical and Magnetization-Induced Second Harmonic Generation Techniques for Studies of Magnetic Nanostructures

100%
Bonda A., Uba S., Uba L.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1225-1227
EN
The work concerns application of titanium-sapphire femtosecond laser oscillator with 82 MHz repetition rate at 800 nm in measurements of ultrafast magneto-optical and magnetization-induced second harmonic generation effects. Time-resolved magneto-optical Kerr effect pump-probe method was used in investigation of ultrafast precession of magnetization in Fe/Au multilayers. Magnetization precession frequency, obtained as a function of magnetic field applied, allows determining saturation magnetization and damping factor. The magnetization-induced second harmonic generation effect has been used for study of garnet films. This method allows to determine crystallographic symmetry and hysteresis loops in an external magnetic field at 2 ω laser induced frequency. The simultaneous measurements of linear and second order magneto-optical effects enable to investigate magnetic interfaces in the studied structures.
3
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Second-Harmonic Generation Studies of Inhomogeneous Magnetization Distributions in Thin Garnet Film

100%
Bonda A., Uba S., Uba L.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
511-513
EN
The magnetization processes can be effectively studied using magnetization-induced second-harmonic generation effect (MSHG). The aim of the current work is the investigation of inhomogeneous magnetization distributions induced in the surface area of the garnet film by ion implantation. The studies were performed on magnetic garnet film of (111) symmetry, implanted with H⁺₂ ions of 1.5 × 10¹⁶ cm¯² dose and 60 keV energy. The measurements of MSHG effect were performed as a function of the sample rotation angle and the amplitude of external magnetic field. The observed MSHG intensity hystereses were subjected to a decomposition procedure into contributions having different magnetic field dependences. The contributions originating from the implanted and unimplanted parts of the film volume of different magnetic ordering were analyzed and discussed.
4
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Electronic Structure, Optical and Magneto-Optical Properties and X-Ray Magnetic Circular Dichroism in Hybrid Heterostructures Sr₂CrReO₆/BaTiO₃

88%
Antonov V., Bekenov L., Uba S., Bonda A., Uba L.
Acta Physica Polonica A
|
2018
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vol. 133
|
issue 3
456-458
EN
We report on the electronic structure of hybrid heterostructure combined the ferromagnetic double perovskite Sr₂CrReO₆ (SCRO) and ferroelectric BaTiO₃ (BTO) calculated in the GGA approach using the fully relativistic spin-polarized Dirac LMTO method. The optical and MO properties as well as the X-ray absorption spectra and X-ray magnetic circular dichroism at the Ti, Ba, and Re L_{2,3} edges and O K edges of the SCRO/BTO heterostructures were investigated theoretically from the first principles. It was shown that the calculations reproduce well available experimental spectra and allow to explain the microscopic origin of the SCRO/BTO heterostructures optical, MO and XMCD spectra.
5
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Ultrafast Magnetization Dynamics in Epitaxial Ni-Mn-Sn Heusler Alloy Film

88%
Bonda A., Uba S., Załęski K., Dubowik J., Uba L.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
501-504
EN
The work is devoted to studies of ultrafast magnetization dynamics induced by femtosecond laser pulses in ferromagnetic Ni-Mn-Sn shape memory Heusler alloy. We studied epitaxial thin Ni_{54.3}Mn_{31.9}Sn_{13.8} film deposited on (001) MgO substrate. Spin precession in an external magnetic field was triggered and detected by the time-resolved magneto-optical Kerr effect (TRMOKE) using pump-probe technique in dual color scheme experiment. Measurements were performed as a function of magnetic field H and pulse power P. The measured TRMOKE signal is composed of oscillatory and background components, both decaying exponentially in a nanosecond time scale. The precession frequency was determined and found to be varying in the range of 1-10 GHz with H up to 3 kOe and decreasing linearly with P. The dependence of Gilbert damping parameter α on H was determined and discussed.
6
Content available remote

Annealing Effect of Equiatomic Co/Pt Alloy Films

88%
Gontarz R., Luciński T., Uba L., Uba S., Kudryavtsev Y.
Acta Physica Polonica A
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1994
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vol. 85
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issue 2
427-431
EN
Polycrystalline as-sputtered CoPt alloy films near the equiatomic composition were characterized as consisting of a disordered fcc phase with preferred texture along [111] orientation perpendicular to the film plane. The film annealing at 600°C/16 h induces the disorder-order phase transition confirmed by X-ray diffraction. As a result of the transition an appearance of the ordered tetragonal (fct) phase of AuCuI type with c/a = 0.974 is observed. The c-axis is the easy axis of magnetization. Both longitudinal and polar Kerr hysteresis loops reveal a dramatic increase in the coercivity from 0.1 to 4.5 kOe in annealed CoPt alloy films due to ordering.
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