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Magnetic Force Microscopy of the Ethmoid Bones of Migratory and Non-Migratory Fishes

100%
Gorobets S., Gorobets O., Bulaievska M., Sharau I.
Acta Physica Polonica A
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2018
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vol. 133
|
issue 3
734-737
EN
For a long time it was believed that the biogenic magnetic nanoparticles (BMNs) in the ethmoid bones of fishes and birds are associated with navigation in the geomagnetic field. However, it was proven that BMNs don't affect the ability of migratory birds to orient in the Earth's magnetic field. It is relevant to check the presence of BMNs in organs of migratory and non-migratory fishes. The presence of BMNs was investigated in the samples of ethmoid bones of atlantic salmon, northern pike and silver carp by the method of magnetic force microscopy. As a result, the biological material of ethmoid bones of migratory and non-migratory fishes contain both separate BMNs and their chains, so BMNs in the ethmoid bone of fishes are not related to their ability to migrate in the geomagnetic field.
2
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Excitation of Bulk Spin Waves by Acoustic Wave at the Plane Defect of a Ferromagnet

100%
Gusieva Y., Graczyk P., Gorobets O., Krawczyk M.
Acta Physica Polonica A
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2018
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vol. 133
|
issue 3
489-491
EN
Excitation of bulk spin waves by acoustic wave localized on the elastic planar defect in the bulk ferromagnet was analytically and numerically investigated. We showed that besides magnetic oscillations forced by acoustic wave strain the resonance between Kosevich wave and bulk spin wave can occurs. For the frequency of the Kosevich wave far below the resonance frequency the amplitude of dynamic magnetization is negligible. For the frequency above the resonance the acoustic wave excites bulk spin wave of the same frequency but different absolute value of the wave vector.
3
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Detection of Biogenic Magnetic Nanoparticles in Human Aortic Aneurysms

88%
Darmenko Y., Gorobets O., Gorobets S., Sharay I., Lazarenko O.
Acta Physica Polonica A
|
2018
|
vol. 133
|
issue 3
738-741
EN
The presence of biogenic magnetic nanoparticles (BMNs) in aortic aneurysm is detected using magnetic force microscopy. The presence of BMNs (single BMN and their chains) in aortic aneurysm may cause magneto-dipole interactions of these BMNs with BMNs of microorganisms - pathogens of heart and with artificial magnetic nanoparticles in the drug delivery systems. The accumulation of BMNs in the human heart can be attributed not only to the process of biomineralization BMNs directly in the tissues of heart but due to the accumulation of microorganisms - pathogens of heart that are natural producers of BMNs.
4
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Control of the Spin Wave Phase in Transmission through the Ultrathin Interface between Exchange Coupled Ferromagnetic Materials

88%
Mailian M., Gorobets O., Gorobets Y., Zelent M., Krawczyk M.
|
EN
In this paper, we show analytically and numerically, that the ultrathin metallic layer up to few monatomic layers separating two ferromagnetic media, which are exchange coupled, can effectively change the phase of the reflected or transmitted spin waves. Taking into account ground states with parallel orientations of the magnetization vectors, we developed the analytical model, which shows the possibility of spin-wave phase control by varying the exchange coupling strength between two ferromagnets. Moreover, we demonstrate with micromagnetic simulations that the effect still exists for the spin waves propagating in thin ferromagnetic film during the reflection or transmission from the interface, where interlayer exchange interactions are present.
5
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The Resonant Dynamic Magnetization Distribution in Ferromagnetic Thin Film with the Antidot

88%
Busel O., Zelent M., Gorobets O., Gorobets Y., Krawczyk M.
Acta Physica Polonica A
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2018
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vol. 133
|
issue 3
492-494
EN
The influence of homogeneous dynamic microwave magnetic field applied to the permalloy (Py) thin film with a single circular antidot on the magnetization dynamics was theoretically investigated. It was considered that the Py film is saturated by the external constant magnetic field along the direction perpendicular to the film plane. The linearized Landau-Lifshitz equation was applied in order to create an analytical model of small deviations from the equilibrium values of the magnetization and magnetic field. Conditions of the local ferromagnetic resonances were defined and the dependency of resonance frequency on the magnetic field magnitude was visualized. The model has shown that the amplitude of the resonant magnetization oscillations is localized near the antidot edge and their position is dependent on the frequency.
6
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Influence of Biogenic Magnetic Nanoparticles on the Vesicular Transport

76%
Mikeshyna H., Darmenko Y., Gorobets O., Gorobets S., Sharay I., Lazarenko O.
Acta Physica Polonica A
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2018
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vol. 133
|
issue 3
731-733
EN
In this paper, the interaction forces are calculated between chains of BMNs on the cell membrane and vesicles (granules) inside the cell to identify the role of BMNs in vesicular transport in cell. For the first time, the forces arising between the vesicle and BMNs inside the cell were calculated, with vesicles being considered as effectively paramagnetic, paramagnetic and vesicles containing magnetic nanoparticles. The comparison was carried out of the forces arising between the vesicle and BMNs with the forces of the antigen-antibody, with the force necessary for the functioning of the magnetic tweezers and with the forces that molecular motors develop. It was determined that the forces of magnetic-dipole interaction of BMN with vesicles can significantly affect vesicular transport in cells.
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