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Inelastic Neutron Scattering in γ-Mn(12%Ge) Alloy Above and Below the Néel Temperature

100%
Jankowska-Kisielińska J., Mikke K., Hennion B.
Acta Physica Polonica A
|
2000
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vol. 97
|
issue 3
559-562
EN
The magnetic excitations different from spin waves in the γ-Mn(12%Ge) antiferromagnet are the subject of the present investigation. The inelastic neutron scattering was measured at 4 temperatures above T_{N}. The Lorentzian-type formula for the inelastic neutron scattering cross-section with the spectral width for a hydrodynamic region was used for data analysis. The obtained values of the "stiffness constants" are of the order of 200 meV Å and they depend weakly on temperature in the range of 1.04-1.25T_{N}. The inelastic neutron scattering for energy transfers below and close to the value of the gap energy of the spin wave spectrum was measured at room temperature. The observed intensities can be treated as a sum of intensities of neutrons scattered on spin waves around the magnetic Brillouin zone centre and = those scattered on fluctuations at the zone boundary.
2
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Anisotropy of the Neutron Scattering in the Paramagnetic Phase and on the Spin Waves in the Mn_{0.71}Ni_{0.29} Alloy

100%
Jankowska-Kisielińska J., Fijał-Kirejczyk I., Mikke K.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
203-205
EN
We have confirmed the significant anisotropy of the generalised magnetic susceptibility in the paramagnetic and antiferromagnetic phase of the fcc Mn-Ni alloys. In this paper the detailed account of the experiments performed on the Mn_{0.71}Ni_{0.29} alloy is given. Our main result for the paramagnetic phase is that the correlation length is larger for the direction parallel to the anisotropy axis than for the perpendicular one by a factor of 1.6. The spin-wave velocity observed at 15 K is higher for the direction parallel to the anisotropy axis than that for the perpendicular direction by a factor of 1.2. These results are similar to that for the Mn_{0.62}Ni_{0.38} alloy. Our results indicate that the magnetic carriers are more localized and the magnetic interactions are less extended in alloys with higher Ni concentration.
3
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Structure and Short Range Order of Two Phases in the Single Domain Mn_{0.75}Cu_{0.25} Alloy after Spinodal Decomposition

100%
Jankowska-Kisielińska J., Świderska K., Mikke K.
Acta Physica Polonica A
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2010
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vol. 117
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issue 4
582-585
EN
The aim of the present paper was to identify the atomic and magnetic structure and short-range order of the two phases present in the Mn_{0.75}Cu_{0.25} alloy after decomposition and plastic deformation. The sample was investigated by elastic neutron scattering at small-angle and 3-axes spectrometers. We have confirmed the decomposition of the alloy into two types of regions with manganese concentration increased and decreased as compared with the mean value. The crystal lattice in regions of both types is tetragonal (pseudo FCT) below T_{N} but degree of tetragonal distortion is different. The long range antiferromagnetic order is present only in the regions of bigger distortion and higher Mn concentration. In the regions of lower Mn content and smaller distortion there is a short range ordering of complex magnetic and atomic character.
4
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Diffuse Neutron Scattering in the Mn_{0.4}Cu_{0.6} Alloy

100%
Jankowska-Kisielińska J., Mikke K., Fijał-Kirejczyk I.
Acta Physica Polonica A
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2008
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vol. 113
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issue 4
1171-1178
EN
The diffuse neutron scattering in the Mn_{0.4}Cu_{0.6} alloy was measured in the temperature range 15-390K at the 3-axis neutron spectrometer at MARIA reactor in Świerk. The broad maxima of the neutron intensity were observed in the surrounding of the (0.5, 1, 0) reciprocal lattice point and other symmetry related points. The effect is similar to that observed in Mn-Cu alloys with lower Mn content at room temperature. Our results are in agreement with the earlier finding that the maxima of the short-range order incommensurate spin density wave scattering are placed at the (0.5±δ, 1, 0) reciprocal lattice point with a linear dependence of δ on the Mn concentration. In addition, some commensurate antiferromagnetic short-range order was found.
5
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Temperature Dependence of Magnetic Inelastic Neutron Scattering in Mn(12%Ge) Alloy

88%
Jankowska-Kisielińska J., Mikke K., Milczarek J. J., Hennion B., Udovenko V. A.
Acta Physica Polonica A
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1997
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vol. 91
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issue 2
483-486
EN
A systematic study of temperature dependence of magnetic inelastic neutron scattering for itinerant antiferromagnet Mn(12%Ge) is presented. At low temperatures the experimental data are well described in terms of damped spin waves. This description becomes insufficient at least 150 K below T_{N}. In the temperature range 200-400 K the integrated intensity of distribution for energy transfer 13 THz increases by one third and the shape of the deconvoluted neutron scattering cross-section changes. These changes suggest that ca. 200 K below T_{N} an additional contribution to the inelastic neutron scattering starts to appear and that its origin is different from spin waves.
6
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Application of Neutron Refraction for Characterization and Optimization of High-Damping Iron-Based Alloys

88%
Udovenko V., Polyakova N., Chudakov I., Milczarek J., Mikke K.
Acta Physica Polonica A
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1999
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vol. 96
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issue 2
303-306
EN
High-damping alloys with the magnetomechanical damping mechanism, based on the Fe-Cr system, have been studied. It has been shown that the direct investigation of the magnetic domain structure in the bulk materials using the neutron refraction method allows one to obtain important quantitative information concerning the formation of the high-damping state. The dependence of the damping capacity on the average magnetic domain size was found to possess a sharp maximum, thus revealing a range of the optimal domain sizes. The results obtained are important for the development of the technology of high-damping materials.
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