Autor: Kovacs, Gy. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Separation of Magnetization Loop in Domain Wall Movement and Domain Rotation Contributions for Soft Magnetic Materials
Autorzy:: Varga, L.
Kovács, Gy.
Powiązania:: https://bibliotekanauki.pl/articles/1813593.pdf
Data publikacji:: 2008-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Bb
75.60.-d
Opis:: 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 0.05 $H_c$. 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.
Źródło:: Acta Physica Polonica A; 2008, 113, 1; 159-162
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Quantum Magnetotransport in InGaAs/InP at High Magnetic Fields and Low Temperatures
Autorzy:: Kovacs, Gy.
Novikov, V.
Gombos, G.
Podor, B.
Remenyi, Gy.
Powiązania:: https://bibliotekanauki.pl/articles/1876235.pdf
Data publikacji:: 1995-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.20.Dx
Opis:: Quantum Hall effect and Shubnikov-de Haas effect measurements were made in two-dimensional electron gas in liquid phase epitaxially grown Ga$\text{}_{0.47}$In$\text{}_{0.53}$As/InP heterostructures in high magnetic fields in the temperature range from 4.2 K down to 60 mK. Two-dimensional electron gas concentrations and mobilities were in the range of (1 - 3) × 10$\text{}^{11}$ cm$\text{}^{-2}$ and (1 - 3) × 10$\text{}^{4}$ cm$\text{}^{2}$/(V s), respectively. Corresponding to this the i = 1 quantum Hall effect plateau occurred at about 6 T magnetic field. Although fractional occupation numbers of about 0.3 were reached, no signs of fractional quantization were detected. Both current and frequency breakdown of the quantum Hall effect were investigated. Narrowing of the plateaus with increasing current differs from that measured in GaAs/AlGaAs structures because of the different mechanisms of dissipation. The fact that the magnetic length becomes smaller than the characteristic scale of the disorder seems to be essential in understanding the low frequency breakdown via the presence of quasi-classical electron states.
Źródło:: Acta Physica Polonica A; 1995, 87, 2; 473-476
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Activated Transport in Magnetic-Field Induced Insulating Phase in Two-Dimensional Electron Gas in InGaAs/InP Heterostructures
Autorzy:: Pődör, B.
Gombos, G.
Reményi, G.
Kovács, Gy.
Savel'ev, I. G.
Novikov, S. V.
Powiązania:: https://bibliotekanauki.pl/articles/1968409.pdf
Data publikacji:: 1997-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.20.Dx
Opis:: 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.
Źródło:: Acta Physica Polonica A; 1997, 92, 5; 945-949
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Wigner Crystallization in InGaAs/InP Heterostructures with a Strong Disorder
Autorzy:: Kovács, Gy.
Remenyi, G.
Gombos, G.
Savel'ev, I. G.
Kreshchuk, A. M.
Hegman, N.
Pödör, B.
Powiązania:: https://bibliotekanauki.pl/articles/1933825.pdf
Data publikacji:: 1995-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.20.Dx
Opis:: 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.
Źródło:: Acta Physica Polonica A; 1995, 88, 4; 783-786
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Energy Relaxation in Two-Dimensional Electron GaS in InGaAs/InP via Electron-Acoustic Phonon Interaction
Autorzy:: Kreshchuk, A. M.
Novikov, S. V.
Savel'ev, I. G.
Polyanskaya, T. A.
Pődör, B.
Reményi, G.
Kovács, Gy.
Powiązania:: https://bibliotekanauki.pl/articles/1991650.pdf
Data publikacji:: 1998-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.20.-i
Opis:: The energy relaxation in two-dimensional electron gas in In$\text{}_{0.53}$Ga$\text{}_{0.47}$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$\text{}_{14}$=(1.1±0.1)×10$\text{}^{7}$ V/cm. Available data for the piezoelectric constant of In$\text{}_{x}$Ga$\text{}_{1-x}$As are discussed in the light of the results of this work.
Źródło:: Acta Physica Polonica A; 1998, 94, 3; 415-420
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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