Autor: Gmitra, M. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Current-Driven Magnetoresistance Oscillations in Asymmetric Spin Valves
Autorzy:: Gmitra, M.
BarnaŚ, J.
Tematy:: 75.60.Ch
75.70.Cn
75.70.Pa; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1814032.pdf Link otwiera się w nowym oknie
Opis:: Within the macroscopic model we have calculated spin-transfer torque in asymmetric spin valves in the diffusive transport limit.Such systems exhibit a non-standard angular dependence of the torque, which leads to current-induced precessional modes at zero external magnetic field. We have found that the frequency of magnetoresistance oscillations exhibits hysteretic behavior when the system is driven between two steady precessional regimes. A finite temperature can suppress the irreversibility and give rise to bistable regime where, both the precessional regimes coexist.
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Defect Sensitivity of Magnetic Dot Arrays Influenced by Thermal Activation and Intradot Anisotropy
Autorzy:: Baláž, P.
Horváth, D.
Gmitra, M.
Tematy:: 61.80.Az
74.25.Fy
74.72.Bk
02.70.Bf; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1813931.pdf Link otwiera się w nowym oknie
Opis:: The influence of non-magnetic central node defect on magnetic hysteresis of regular square-shaped segment of magnetic dot array with perpendicular uniaxial anisotropy under the thermal activation was investigated via computer simulations based on stochastic Landau-Lifshitz-Gilbert equation. The aim of this study is to point out the simultaneous effect of anisotropy and thermal activation to the dynamical properties of magnetic dot arrays.
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: First-Principles Study of Kondo Insulator $SmB_{6}$
Autorzy:: Gmitra, M.
Čenčariková, H.
Farkašovský, P.
Tematy:: 71.28.+d
71.20.-b
71.27.+a; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1369765.pdf Link otwiera się w nowym oknie
Opis:: We applied the Perdew-Burke-Ernzerhof hybrid functional (PBE0) within the density functional theory (DFT) to study electronic properties of the heavy fermion Kondo semiconductor $SmB_{6}$. The calculation of the Hartee-Fock exchange contribution to the exact-exchange within the atomic sphere approximation for bulk $SmB_{6}$ represents a computationally efficient, parameter-free method that provides good qualitative and quantitative agreement with photoemission experiments. Specifically, we found an energy difference of 7 eV between the occupied and unoccupied correlated Sm f states. Furthermore, the spin-orbit coupling yields a splitting of the occupied Sm f states of about 1 eV in agreement with recent angular resolved photoemission spectroscopy. The electronic spectrum in the vicinity of the X point shows a hybridization between the Sm 5d conduction band and the localized Sm 4f states at the Fermi level. This might lead to a transport gap opening.
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Thermally Assisted Current-Driven Dynamics in Asymmetric Spin Valves
Autorzy:: Gmitra, M.
Barnaś, J.
Horváth, D.
Tematy:: 75.60.Ch
75.70.Cn; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1813513.pdf Link otwiera się w nowym oknie
Opis:: Current-induced steady precessional modes in standard spin valves are usually excited as an interplay of spin-transfer torque, Gilbert damping, and external magnetic field. We propose an asymmetric spin valve, in which the spin current can excite stationary precessional modes also at zero external magnetic field. We also show that finite temperature can induce transitions between different dynamical modes. These transitions, in turn, lead to telegraph noise in magnetoresistance.
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Current-Pulse-Induced Switching οf Asymmetric Spin Valves
Autorzy:: Baláž, P.
Gmitra, M.
Barnaś, J.
Tematy:: 72.25.Ba
73.21.Ac; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1810525.pdf Link otwiera się w nowym oknie
Opis:: Dynamical behavior of an asymmetric spin valve, Co/Cu/Py nanopillar sandwiched between Cu electrodes, subject to a spin-polarized current was investigated in the diffusive transport regime. Using numerical macrospin simulations, the dynamical diagrams of the sensing layer were constructed, and the possibilities of switching from one collinear state to the other were discussed. A simple switching scheme for asymmetric spin valves, based on a sequence of current and magnetic field pulses, was proposed and illustrated on an example.
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 6.

Tytuł:: Spin-Dependent Phenomena in Magnetoelectronic Devices
Autorzy:: BarnaŚ, J.
Gmitra, M.
Rudziński, W.
Wawrzyniak, M.
Dugaev, V.
Kunert, H.
Tematy:: 75.60.Ch
75.70.Cn
75.70.Pa; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1814031.pdf Link otwiera się w nowym oknie
Opis:: Spin effects in electronic transport properties of artificial magnetic structures, like nanopillar spin valves, tunnel junctions, mesoscopic double-barrier junctions (single-electron transistors) are briefly discussed. Two classes of spin effects are distinguished; i.e. magnetoresistance phenomena due to magnetization rotation, and current-induced magnetic switching and magnetic dynamics.
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 7.

Tytuł:: Electronic structure of commensurate, nearly commensurate, and incommensurate phases of 1T−TaS_{2} by angle-resolved photoelectron spectroscopy, scanning tunneling spectroscopy, and density functional theory
Autorzy:: Stepniewski, R.
Kowalczyk, D. A.
Lutsyk, I.
Binder, J.
Lacinska, E.
Busiakiewicz, A.
Krukowski, P.
Kołodziej, Jacek
Klusek, Z.
Gmitra, M.
Kowalczyk, P. J.
Dabrowski, P.
Kopciuszynski, M.
Jalochowski, M.
Olszowska, Natalia
Rogala, M.
Szalowski, K.
Wysmolek, A.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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