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1
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Slow Relaxation of Resistance in Manganite Perovskite Nanoconstrictions

100%
Baszyński J.
Acta Physica Polonica A
|
2009
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vol. 115
|
issue 1
339-341
EN
The time decay of the surface resistance R_{S}(t) was measured for the La_{0.7}Sr_{0.3}MnO_{3} perovskite nanocontacts obtained by break technique at liquid nitrogen. The corresponding time relaxation can be described by two-term formula: stretched exponential function and logarithmic dependence. The characteristic times τ_{1} and τ_{2} of the relaxation processes are of order of seconds and few tens of seconds, respectively. The appearance of both contributions evidences the existence of two sources of relaxation, which can be assigned to inhomogeneous changes of the angle between the magnetic moments of the neighboring Mn ions inside spin blocks (τ_{1}) and between the spin blocks (τ_{2}) occurring near surface of the nano-electrodes. Similar to magnetic viscosity, the dependence of resistance viscosity S_{R} on basis current is characterized by bell-shaped curve. These results point out the important role of the structural arrangements of the Mn-ions into spin blocks on the surfaces electrodes of the nanocontact.
2
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Magnetic Anisotropy of Fe Films in MgO/Cu(t_{Cu})/Fe/Cu Systems

64%
Baszyński J., Toliński T.
Acta Physica Polonica A
|
1997
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vol. 91
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issue 2
245-248
EN
Ferromagnetic resonance was employed to study the magnetic anisotropy of the Fe thin film in the MgO/Cu(t_{Cu})/Fe/Cu system. The Fe film showed strong fourfold cubic anisotropy (H_{K_{1}} = 2K_{1}/M = 46.15 kA/m) for t_{Fe} = 23 nm and t_{Cu} = 0. The spread of the crystallographic axes Δβ = 0.5° was evaluated from the angular dependence of the resonance line width ΔH_{pp} (4.4 < ΔH_{pp} < 6.4 kA/m). Such a small mosaicity confirmed the epitaxial growth of the Fe film. The Cu buffer layer destroys this growth of the Fe film which showed only a weak anisotropy.
3
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Magnetotunneling Experiments Using La_{0.7}Sr_{0.3}MnO_{3} Based Break Junctions

64%
Baszyński J., Toliński T.
Acta Physica Polonica A
|
2000
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vol. 98
|
issue 5
567-570
EN
The La_{0.7}Sr_{0.3}MnO_{3} perovskite is a ferromagnetic half-metal with a strong spin polarization and high Curie temperature T_{C} (355K). We have shown that a combination of the break junction technique with the special properties of the La_{0.7}Sr_{0.3}MnO_{3} perovskite can lead to extremely high values of tunneling magnetoresistance ratio (> 10^{3}%) and high field sensitivity (30%/Oe). These results are obtained in magnetic fields below 1kOe and at room temperature.
4
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Magnetic Properties in Mn Pure Powder

51%
Szlaferek A., Baszyński J., Waplak S., Jóźwiak K.
Acta Physica Polonica A
|
1997
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vol. 92
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issue 2
311-314
EN
The structural and magnetic properties of deformed powder of Mn obtained by mechanical grinding have been investigated using X-ray diffraction and magnetic measurements. The small values of ferromagnetic moment of Mn after grinding are attributed to the formation of a deformed phase at the surface of grains with enlargement of the interatomic spacings at the grains boundaries.
5
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Electronic, Magnetic and Transport Properties of YCo_{3}B_{2} Compound

51%
Kowalczyk A., Jezierski A., Smardz L., Baszyński J.
Acta Physica Polonica A
|
2000
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vol. 97
|
issue 5
803-806
EN
We studied the electronic, magnetic and transport properties of the hexagonal YCo_{3}B_{2} compound. The electronic structure was studied by X-ray photoemission spectroscopy and ab initio self-consistent tight binding linear muffin tin orbital method. We found a good agreement between the experimental X-ray photoemission spectroscopy valence band spectra and theoretical calculations. Theoretical calculations showed that the YCo_{3}B_{2} is a paramagnet in agreement with experimental results. Electrical resistivity at low temperatures shows a T^{2} dependence, implying that the scattering by the spin fluctuactions is dominant in this temperature range.
6
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Correlation between Magnetic Phases and Insulator-Metal Transition in La_{1/3}Nd_{1/3}Ca_{1/3}MnO_{3} Perovskite

51%
Baszyński J., Idzikowski B., Toliński T., Hoser A.
Acta Physica Polonica A
|
2000
|
vol. 97
|
issue 5
779-782
EN
The La_{1/3}Nd_{1/3}Ca_{1/3}MnO_{3} ceramic perovskites are investigated using the neutron diffraction technique and resistance measurements in the temperature range from 260 K down to 5 K. We have found that the integrated intensity of the antiferromagnetic peaks was growing with decreasing temperature and reached the maximum at a temperature about 20 K lower than that of the semiconductor-metal transition and did not vanish at 5 K. The semiconductor-metal transition is correlated with the temperature of the maximum of the lattice c-parameter and the percolation of ferromagnetic domains. Our results suggest that although the ferromagnetic long-range order is established through the semiconductor-metal transition induced percolation network, locally the antiferromagnetic correlation can remain.
7
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Neutron Diffraction Study of Ferromagnetic Ordering in La_{1/3}Nd_{1/3}Ca_{1/3}MnO_{3} Induced by Electric Field

51%
Baszyński J., Idzikowski B., Toliński T., Hoser A.
Acta Physica Polonica A
|
2000
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vol. 97
|
issue 5
831-834
EN
We used the neutron diffraction technique to study the ferromagnetic ordering process in La_{1/3}Nd_{1/3}Ca_{1/3}MnO_{3} induced by the short impulse of the external electric field E=4 V/cm at a magnetic field H=1.5 T. Our sample was prepared by the standard solid-state reaction. The diffraction measurements at 4 K, carried out for the neutron wavelength λ=0.2442 nm, have revealed the orthorhombic perovskite structure with the unit-cell parameters: a=0.5480 nm, b=0.5550 nm and c=0.7737 nm. We observed that a short impulse of the electric field develops the ferromagnetic ordering in a similar way as the magnetic field up to 4 T. We assume that the increased ferromagnetic ordering induced by the external electric field at a given magnetic field has the same physical origin as in the case of the Zener double exchange. The effect is confirmed by magnetic moment measurements using vibrating sample magnetometer.
8
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Magnetic Transition in La_{1/3}Nd_{1/3}Ca_{1/3}MnO_{3} Perovskite Induced by Electric Field at a Given Magnetic Field

51%
Baszyński J., Kowalczyk A., Kováč J.
Acta Physica Polonica A
|
2000
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vol. 97
|
issue 5
879-882
EN
We report the discovery of new effect in La_{1/3}Nd_{1/3}Ca_{1/3}MnO_{3} - the jump of magnetization induced by external electric field E (2.5-4)V/cm at a given magnetic field H (18-25) kOe at T=4.2 K. This effect is large when compared with a metamagnetic transition induced by the magnetic field in many substances. The origin of the magnetization jump induced by external electric field has not yet been explained. We assume that this transition is induced by the hopping of E-excited e_{g} electrons and that this is a source of a jumpwise increase in magnetization in the non-collinear magnetic phase within the perovskite. This effect can be attributed to a strong coupling between carriers induced by the electric field (the conduction electrons e_{g}), and the local magnetic moments (t_{2g}-localized spins) through a mechanism of the Zener double exchange.
9
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X-Ray Photoemission Spectra of Dy(Co_{1-x}Al_{x})_{2} Systems

39%
Szajek A., Jezierski A., Kowalczyk A., Baszyński J., Bartkowski S., Neumann M., Borstel G.
Acta Physica Polonica A
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1997
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vol. 91
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issue 2
439-442
EN
The electronic structure of Dy(Co_{1-x}Al_{x})_{2} compounds (Laves phase - MgCu_{2}, C15) for Al concentrations x = 0.0, 0.1, 0.2 was investigated by X-ray photoelectron spectroscopy. The results were compared with the ab initio band structure calculations.
10
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Electronic Structure and Transport Properties of UFe_{2} System

39%
Szlaferek A., Szajek A., Baszyński J., Smardz L., Kowalczyk A., Timko M.
Acta Physica Polonica A
|
2000
|
vol. 97
|
issue 5
815-818
EN
The electronic structure of the UFe_{2} compound was studied by X-ray photoemission spectroscopy and ab initio self-consistent tight binding muffin tin orbital method. This compound crystallizes in a cubic Laves phase. The calculated valence band spectrum is characterized by two peaks due to U(5f) and Fe(3d) states. We have found a good agreement between the experimental valence band spectrum and theoretical ab initio calculations. The carrier concentration estimated from the Hall effect amounts to ≈10^{22} cm^{-3}.
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