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    Wyświetlanie 1-9 z 9
    Tytuł:
    Current-Pulse-Induced Switching οf Asymmetric Spin Valves
    Autorzy:
    Baláž, P.
    Gmitra, M.
    Barnaś, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810525.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.25.Ba
    73.21.Ac
    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.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 278-280
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anisotropy Distribution in NiFe/Au/Co/Au Multilayers
    Autorzy:
    Dubowik, J.
    Stobiecki, F.
    Gościańska, I.
    Kociemba, M.
    Bednarski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810556.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.Ac
    75.30.Gw
    76.50.+g
    Opis:
    We present results of FMR investigations of anisotropy distribution in uncoupled $[NiFe/Au/Co/Au]_N$ structures with alternating in-plane (NiFe) and out-of-plane anisotropies (Co). It is concluded that for NiFe layers anisotropy distribution is negligible and can be increased by "dusting" of NiFe with ultrathin Co layers. The perpendicular anisotropy $K_{U}^2$ of Co layers depends on Co thickness in a standard way ∝ 1/$d_{Co}$, and is distributed in a range of ≈10-20% of $K_{U}^2$ (i.e., ≈ 1.5× $10^6$ erg/$cm^3$).
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 315-318
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Non-Classical Distribution Function to Transport Properties of Semiconductor Nanodevices
    Autorzy:
    Wójcik, P.
    Spisak, B.
    Wołoszyn, M.
    Adamowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812023.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.-b
    73.21.Ac
    72.80.Ey
    Opis:
    The non-classical distribution function formalism is used for studying the electron transport in a nanosystem. We calculated the current-voltage characteristics of a triple barrier one-dimensional nanostructure which is connected to three-dimensional (highly doped semiconductor) reservoirs by the ohmic contacts. We also estimated the peak-to-valley ratio for the considered nanostructure and discussed the effect of switching the bias from peak-to-valley and from valley-to-peak voltages.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1431-1436
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Dependence of Exchange Anisotropy of FeNi/FeMn Bilayers
    Autorzy:
    Żuberek, R.
    Gutowski, M.
    Szymczak, H.
    Gnatchenko, S.
    Merenkov, D.
    Bludov, A.
    Verkin, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813596.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.Ac
    75.30.Et
    75.70.-i
    76.50.+g
    Opis:
    The influence of the bilinear and biquadratic coupling on the exchange anisotropy of the ferromagnetic/antiferromagnetic bilayer was studied by variable angle and temperature dependent ferromagnetic resonance. From the angular dependence of the resonance field the bilinear and biquadratic exchange coupling constants were determined.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 167-170
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport Properties of Disordered Graphene Layers
    Autorzy:
    Gryglas-Borysiewicz, M.
    Jouault, B.
    Tworzydło, J.
    Lewińska, S.
    Strupiński, W.
    Baranowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791293.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.Ac
    72.20.Fr
    73.43.Qt
    73.63.Bd
    Opis:
    Samples consisting of a few layers of graphene obtained by thermal decomposition of SiC were studied by means of transport experiments at 4 K and in a magnetic field up to 7 T. Transport data show that the samples have a two-dimensional character. Magnetoresistance has an approximately linear character at high magnetic fields, which has been previously observed in graphite samples, and a negative magnetoresistance, at low magnetic fields. The transverse resistivity $ρ_{xy}$ is nonlinear as a function of B, which can be described using a many-carrier model.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 838-840
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hall Effect and Magnetoresistance in Magnetic Multilayers with Alternating In-Plane and Out-of-Plane Anisotropies
    Autorzy:
    Błaszyk, M.
    Luciński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813492.pdf
    Data publikacji:
    2008-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.Ac
    73.40.-c
    75.47.De
    75.70.-i
    72.15.Gd
    Opis:
    A direct comparison between the Hall effects and giant magnetoresistance of ferromagnetic multilayers of similar composition $(Ni_{80}Fe_{20}//Au//Co//Au)_N$ with alternating in-plane and out-of-plane magnetization direction of Co layers is presented. The characteristic features at magnetic field-dependence of giant magnetoresistance were correlated with the creation and annihilation of the stripe domains in Co layer, with perpendicular anisotropy. The nucleation field values were investigated as an Au layer thickness function. Furthermore, the in situ conductance measurement results characterised the island growth mode of the ferromagnetic layers. The percolation thicknesses were also indicated.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 2; 663-668
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Deposition Temperature οn Magnetotransport Properties οf Ni-Fe/Au/Co/Au Multilayers
    Autorzy:
    Błaszyk, M.
    Chomiuk, P.
    Buchta, K.
    Luciński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810589.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.Ac
    73.40.-c
    75.47.De
    75.70.-i
    72.15.Gd
    Opis:
    A correlation between the growth process and electrical properties of $[Ni_{80}Fe_{20}(2 nm)//Au(2 nm)//Co(0.8 nm)//Au(2 nm)]_{15}$ multilayers is presented. A set of multilayers of identical composition was deposited in different temperatures. The changes in giant magnetoresistance amplitude were correlated with the changes in Co layers growth process that occur in different temperatures. The in situ conductance measurement leads to the growth mechanism identification in high temperatures as formation of Co islands. Intensified islandisation of Co was eventually confirmed by the temperature changes in shape of the Hall voltage loops, and the evolution of Co layers contribution.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 363-365
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interval Computations of Ferromagnetic Resonance Conditions in Exchange-Biased Bilayers
    Autorzy:
    Gutowski, M.
    Żuberek, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810606.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.70.-c
    73.21.Ac
    75.30.Et
    75.70.-i
    76.50.+g
    Opis:
    The main purpose of this paper is to promote the use of interval calculus in physics. As an example we use the system consisting of two thin films, one ferromagnetic and another one antiferromagnetic, deposited one atop of the other. We successfully and accurately simulate the positions of resonance fields of such a system, as seen in ferromagnetic resonance experiment. Interval calculations have revealed the presence of 1, 2 and sometimes even 4 distinct equilibrium configurations of the system, all corresponding to the same resonance field, when the field has a component antiparallel to that of cooling field, while only 1 such position when it points in the opposite direction. In both cases only a single resonance line is observed. As an added value we show that the exchange-biased system is in the metastable state, out of true thermodynamical equilibrium.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 390-392
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MFM Investigations of $[NiFe//Au//Co//Au]_N$ Multilayers
    Autorzy:
    Bazarnik, M.
    Dabrowski, J.
    Czajka, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810474.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.Ac
    74.25.Ha
    75.30.Gw
    75.60.Ch
    75.70.-i
    75.70.Rf
    Opis:
    Magnetic force microscopy measurements combined with computer simulations were applied to investigate the strengths of magnetic field over the $[NiFe//Au//Co//Au]_N$ multilayers with in-plane and out-of-plane anisotropy observed for NiFe and Co layers, respectively. All measurements were performed in air atmosphere at room temperature. Dimensions and density of magnetic domains were estimated. The distribution of magnetization directions was deduced from comparison of magnetic force microscopy with the simulation results. Some sort of modulation in stray magnetic field was observed, but till now it is of unknown origin.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 220-222
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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