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Separation of Magnetization Loop in Domain Wall Movement and Domain Rotation Contributions for Soft Magnetic Materials

100%
Varga L., Kovács G.
Acta Physica Polonica A
|
2008
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vol. 113
|
issue 1
159-162
EN
The domain wall movement and magnetization rotations processes are separated experimentally in quasi-static magnetization process of a Finemet type ultrasoft magnetic material. The reversible domain rotations contribution is obtained from the integration of the reversible permeability, μ_{DR}, as a function of biasing DC field, measured with very small alternative field amplitude, less than 0.05H_c. The domain wall movement component is obtained by the integration of the permeability obtained by extraction of μ_{DR} from the differential permeability derived from one branch of the quasi-static major loop.
2
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Energy Relaxation in Two-Dimensional Electron GaS in InGaAs/InP via Electron-Acoustic Phonon Interaction

61%
Kreshchuk A., Novikov S., Savel'ev I., Polyanskaya T., Pődör B., Reményi G., Kovács G.
Acta Physica Polonica A
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1998
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vol. 94
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issue 3
415-420
EN
The energy relaxation in two-dimensional electron gas in In_{0.53}Ga_{0.47}As/InP has been studied in a wide range of electron temperatures (from 0.1 to 10 K). The energy loss rate of electrons is controlled by the interaction of electrons with the piezoelectric potential of acoustic phonons. The value of the piezoelectric constant for InGaAs lattice-matched to InP is deduced from theoretical fits of the experimental data: h_{14}=(1.1±0.1)×10^{7} V/cm. Available data for the piezoelectric constant of In_{x}Ga_{1-x}As are discussed in the light of the results of this work.
3
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Crystallization in InGaAs/InP Heterostructures with a Strong Disorder

61%
Kovács G., Remenyi G., Gombos G., Savel'ev I. G., Kreshchuk A. M., Hegman N., Pödör B.
Acta Physica Polonica A
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1995
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vol. 88
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issue 4
783-786
EN
Non-linear current-voltage characteristics were observed in the range of filling factors of 0.3 ≤ v ≤ 0.4 in a two-dimensional electron system in InGaAs/InP heterostructures with a strong disorder. The observations are explained qualitatively in terms of magnetic field induced localization and Wigner solidification.
4
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Activated Transport in Magnetic-Field Induced Insulating Phase in Two-Dimensional Electron Gas in InGaAs/InP Heterostructures

61%
Pődör B., Gombos G., Reményi G., Kovács G., Savel'ev I. G., Novikov S. V.
Acta Physica Polonica A
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1997
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vol. 92
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issue 5
945-949
EN
We report on experiments on low temperature (millikelvin range) activated magnetotransport on low-density two-dimensional electron systems in InGaAs/InP for Landau level filling factors 0.25 ≤ ν ≤ 0.55. The activation energy increases approximately linearly with decreasing filling factor. The observations are discussed in the light of the formation of the Wigner solid.
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