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Wyświetlanie 1-15 z 174
Tytuł:
Alternative Random Matrix Approach in Analysis of Correlations in Financial Data
Autorzy:
Sawa, M.
Grech, D.
Powiązania:
https://bibliotekanauki.pl/articles/1388194.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Tp
02.60.-x
89.20.-a
89.75.-k
89.65.Gh
89.75.Fb
Opis:
We present an alternative method based on random matrix approach that enables to distinguish the respective role of temporal autocorrelations inside given time series and cross correlations between various time series. The proposed algorithm is based on the properties of Wigner eigenspectrum of random matrices instead of commonly used Wishart eigenspectrum methodology. It is then qualitatively and quantitatively applied to financial data of stocks building WIG 30 - the main Warsaw Stock Exchange Index.
Źródło:
Acta Physica Polonica A; 2015, 127, 3A; A-118-A-122
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Thermal and Magnetic Properties of Amorphous Ribbons of Fe₆₁Co₁₀B₂₀Y₈Me₁ (where Me = W, Zr, Nb, Mo)
Autorzy:
Pietrusiewicz, P.
Nabiałek, M.
Powiązania:
https://bibliotekanauki.pl/articles/1032157.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Dq
75.50.Kj
65.60.+a
75.30.Gw
Opis:
This paper presents the results pertaining to thermal and magnetic studies of rapidly-cooled samples of the alloy family Fe₆₁Co₁₀B₂₀Y₈Me₁ (where Me = Nb, Zr, W, Mo). The resulting ribbons, or tapes, have amorphous structure. It has been found that the addition of Me elements alters the thermal and magnetic properties. It is noted that the saturation magnetization decreases with increasing number of unpaired electrons on the valence shells. In addition, the value of the coercivity and effective anisotropy have been determined.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 678-680
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Angular Magnetoresistance of a Possible Kondo Insulator CeOs₄Sb₁₂ Measured at Ultra-Low Temperatures
Autorzy:
Bochenek, Ł.
Cichorek, T.
Powiązania:
https://bibliotekanauki.pl/articles/1398635.pdf
Data publikacji:
2016-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.18.+y
71.27.+a
72.15.Qm
75.47.-m
75.30.Fv
75.30.Mb
Opis:
Angular magnetoresistance of the filled skutterudite compound CeOs₄Sb₁₂ has been investigated along the [110] direction. Distinct differences between the angular magnetoresistance data at T = 0.55 K and 4.2 K coincide with a developing of spin-density waves at T ≈ 1.7 K in B = 5 T. Magnetoresistance experiments have been performed on a self-made assembly utilizing a commercial piezoelectric rotator.
Źródło:
Acta Physica Polonica A; 2016, 130, 2; 600-603
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anisotropy of Magnetic and Transport Properties οf $UAuSb_2$ Single Crystals
Autorzy:
Troć, R.
Bukowski, Z.
Stępień-Damm, J.
Sułkowski, C.
Powiązania:
https://bibliotekanauki.pl/articles/1810449.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Lp
71.27.+a
75.30.Gw
Opis:
The uranium-gold diantimonide $UAuSb_2$ belongs to a numerous family of ternary compounds crystallizing in a tetragonal structure of the $HfCuSi_2$-type (space group P4/nmm). In this paper the results of magnetization, electrical resistivity and thermopower measured along the main crystallographic directions are reported. Two magnetic transitions, a ferromagnetic one at $T_C$ =31 K and probably an antiferromagnetic one at $T_N$ = 43 K were found. The spontaneous magnetization at 1.9 K amounts about 0.8 $μ_B$ for B ∥ c-axis. Electrical resistivity for j ⊥ c-axis exhibits a $T^2$ exp(-Δ/kT) dependence at low temperatures and a Kondo effect at higher temperatures above $T_N$. The thermopower S for both main crystallographic directions shows a maximum at the temperature close to $T_C$ and the lack of any anomaly at $T_N$.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 181-184
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anomalous Superconductivity and Antiferromagnetism in the U(Pt,Pd)$\text{}_{3}$ System
Autorzy:
Franse, J. J. M.
Powiązania:
https://bibliotekanauki.pl/articles/2030394.pdf
Data publikacji:
2001-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.27.+a
74.70.Tx
75.30.Mb
Opis:
A review is presented of the anomalous magnetic and superconducting properties of the heavy-fermion compound UPt$\text{}_{3}$ that has been a subject of extensive study during the past twenty years. The normal-state and superconducting properties of the compound were evaluated from magnetic, transport, and thermodynamic studies. In addition, neutron-diff raction and muon spin relaxation experiments were performed in the normal and superconducting states. The compound is characterized by a multiple superconducting phase diagram and by the coexistence of superconductivity and short-range antiferromagnetic interactions with quasi-static moments of the order of 10$\text{}^{-2}$μ$\text{}_{B}$/U-atom. Upon substituting Pt by Pd, the short-range magnetic interactions give way to long-range antiferromagnetic order with a maximal ordering temperature of 6 K for the 5 at.% Pd alloy and a magnetic moment of 0.6μ$\text{}_{B}$/U-atom. Superconductivity and long-range antiferromagnetic order are in competition resulting in a critical composition of 0.6 at.% Pd. At this concentration, non-Fermi liquid behaviour is observed.
Źródło:
Acta Physica Polonica A; 2001, 100, Supplement; 153-176
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Algebraic Combinatorics to Finite Spin Systems
Autorzy:
Florek, W.
Powiązania:
https://bibliotekanauki.pl/articles/2027429.pdf
Data publikacji:
2001-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.20.Bb
75.10.Jm
75.75.+a
Opis:
A finite spin system invariant under a symmetry group G is a very illustrative example of a finite group action on mappings f: X → Y (X is a set of spin carriers, Y contains spin projections for a given spin number s). Orbits and stabilizers are used as additional indices of the symmetry adapted basis. Their mathematical nature does not decrease a dimension of a given eigenproblem, but they label states in a systematic way. It allows construction of general formulas for vectors of symmetry adapted basis and matrix elements of operators commuting with the action of G in the space of states. The special role is played by double cosets, since they label nonequivalent (from the symmetry point of view) matrix elements ãx|H|yã for an operator H between Ising configurations |x〉,|y〉. Considerations presented in this paper should be followed by a detailed discussion of different symmetry groups (e.g.) cyclic or dihedral ones) and optimal implementation of algorithms. The paradigmatic example, i.e. a finite spin system, can be useful in investigations of magnetic macromolecules like Fe_6 or Mn$\text{}_{12}$ acetate.
Źródło:
Acta Physica Polonica A; 2001, 100, 1; 3-22
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Algebraic Combinatorics to Finite Spin Systems with Dihedral Symmetry
Autorzy:
Bucikiewicz, S.
Dębski, L.
Florek, W.
Powiązania:
https://bibliotekanauki.pl/articles/2028876.pdf
Data publikacji:
2001-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.20.Bb
75.10.Jm
75.75.+a
Opis:
Properties of a given symmetry group G are very important in investigation of a physical system invariant under its action. In the case of finite spin systems (magnetic rings as Fe$\text{}_{6}$, Cu$\text{}_{6}$, Fe$\text{}_{10}$, some planar macromolecules as Fe$\text{}_{12}$ or Fe$\text{}_{8}$) the symmetry group is isomorphic with the dihedral group D$\text{}_{N}$. In this paper group-theoretical "parameters" of such groups are determined, especially decompositions of transitive representations into irreducible ones and double cosets. These results are necessary to construct matrix elements of any operator commuting with G in an efficient way. The approach proposed can be useful in many branches of physics, but here it is applied to finite spin systems, which serve as models for mesoscopic magnets.
Źródło:
Acta Physica Polonica A; 2001, 100, 4; 453-475
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the Coupling Model to Magnetic After Effects in the $Fe_{72}Co_{10}Nb_{6}B_{12}$ Amorphous Alloy
Autorzy:
Haneczok, G.
Kubik, P.
Madej, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/1810609.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.-y
75.75.+a
Opis:
It was shown that magnetic reluctivity measured versus time after demagnetization for pre-annealed samples of the $Fe_{72}Co_{10}Nb_6B_{12}$ amorphous alloy exhibits highly non-exponential behavior which can be described by the coupling model. The relaxation intensity and the coupling parameter describing correlation effects in free volume diffusion decrease with increasing 1 h annealing temperature indicating annealing out of free volume and formation of iron clusters in amorphous matrix.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 396-398
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Arrays of Metal Nanostructures Produced by Focussed Ion Beam
Autorzy:
Luches, P.
di Bona, A.
Contri, S.
Gazzadi, G.
Vavassori, P.
Albertini, F.
Casoli, F.
Nasi, L.
Fabbrici, S.
Valeri, S.
Powiązania:
https://bibliotekanauki.pl/articles/1814039.pdf
Data publikacji:
2007-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.50.Bb
75.75.+a
78.20.Ls
68.49.Sf
Opis:
We present a study of the magnetic properties of arrays of nanostructures produced in a focussed ion beam-scanning electron microscope dual beam system. The single magnetic units have been isolated either by direct removal of parts of the metallic film or by local modification of the film magnetic properties. The final quality of the shape and the residual damage strictly depend on beam parameters (spot size and pixel dwell time) and on the swelling properties of the patterned materials. On square Fe(001) elements with a well-defined intrinsic (magnetocristalline) and shape- and size-induced (shape plus configurational) anisotropy we show that the overall magnetic anisotropy is not a mere superposition of the individual contributions. We also demonstrate that with ion irradiation doses below the milling threshold $L1_0$ FePt films with perpendicular magnetic anisotropy undergo a transition from the magnetically hard $L1_0$ phase to the magnetically soft A1 phase leading to an out-of-plane to in-plane spin reorientation. The magnetic properties of the planar arrays obtained by local modification of the film are compared to arrays of sculpted structures of the same material.
Źródło:
Acta Physica Polonica A; 2007, 112, 6; 1297-1312
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bethe Ansatz and Geometry of the Classical Configuration Space
Autorzy:
Lulek, B.
Lulek, T.
Milewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1810414.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.10.Ox
02.40.Sf
31.15.xm
75.75.+a
85.75.Ff
Opis:
We demonstrate that the seminal one-dimensional model of the Heisenberg magnet, consisting of N spins 1/2 with the nearest-neighbour isotropic interaction, solved exactly by Bethe ansatz, admits an interpretation of a system of r=N/2-M pseudoparticles (spin deviations) which are indistinguishable, have hard cores and move on the chain by local hoppings. Such an approach allows us to construct a manifold with some boundaries, which is genericly r-dimensional, and whose F-dimensional regions, 0
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 159-161
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Buffer Induced Magnetic Patterning of Ultrathin Co Layer
Autorzy:
Wawro, A.
Petroutchik, A.
Kurant, Z.
Baczewski, L.
Mazalski, P.
Maziewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1810547.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.-i
75.30.Gw
75.75.+a
68.37.Ps
78.20.Ls
Opis:
The possibility of magnetic anisotropy engineering of ultrathin Co films in the scale of several dozen nanometers is investigated by magnetooptical magnetometry. In Au/Co/Au sandwiches the spin reorientation transition from the out-of-plane to the in-plane configuration is observed, when Co layer thickness exceeds 1.9 nm. Molybdenum as the underlayer suppresses the Co thickness range for which the perpendicular magnetization is stable. The application of patterned buffer in the form of Au islands grown on Mo layer for ultrathin Co film gives rise to the array of spatially stable magnetic dots fabrication ca. 100 nm in lateral size with magnetization perpendicular to the film plane surrounded by the area magnetized in the sample plane.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 306-308
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculations of Ion Beam Emittance for Hot Cavity Ion Source
Autorzy:
Turek, M.
Powiązania:
https://bibliotekanauki.pl/articles/1402237.pdf
Data publikacji:
2015-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.77.Ka
07.05.Tp
34.35.+a
41.75.Ak
41.75.Cn
Opis:
Emittance of short-lived nuclide beams produced in hot cavity ion sources is calculated. Influence of half-life period as well as the average sticking time on beam emittance is under investigation. Two different shapes of ionizer cavity are considered: almost fully spherical and hemispherical ones. Changes of beam emittance due to the extraction channel geometry (its diameter and length) are studied. A new concept of scaled efficiency (ion source brightness analogon) is introduced in order to compare the two-ion source configurations. Phase space portraits of the extracted beams are presented.
Źródło:
Acta Physica Polonica A; 2015, 128, 5; 931-934
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carbon-Encapsulated Magnetic Nanoparticles Based on Fe, Mn, and Cr for Spintronics Applications
Autorzy:
Szczytko, J.
Osewski, P.
Bystrzejewski, M.
Borysiuk, J.
Grabias, A.
Huczko, A.
Lange, H.
Majhofer, A.
Twardowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2047686.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.-g
75.75.+a
75.20.En
75.30.Cr
75.50.Bb
Opis:
We succeeded in the arc-plasma synthesis of carbon-encapsulated Fe, Cr, and Mn-based nanoparticles. The transmission electron microscopy, Mössbauer spectra (of iron) and SQUID magnetometry results demonstrate that the products of the synthesis contain metals and its carbides. The nanoparticles show ferromagnetic or superparamagnetic behavior at high temperatures, which is demanded for nano-spintronics applications.
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 305-310
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carriers Diffusion in GaAs/AlAs Type II Quantum Well
Autorzy:
Lesiak, A.
Chwalisz, B.
Wysmołek, A.
Potemski, M.
Stępniewski, R.
Thierry-Mieg, V.
Powiązania:
https://bibliotekanauki.pl/articles/2044497.pdf
Data publikacji:
2005-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Cr
78.66.Fd
78.67.Hc
75.75.+a
Opis:
The micro-photoluminescence of GaAs/AlAs type II double quantum well structure is presented. The specific band alignment of the investigated system allows obtaining high concentration of long lived carriers. This enables us to study diffusion of carriers and/or indirect excitons. It was found that the carrier flow does not follow the classical diffusion equation and is driven by the potential modification due to the presence of photo created carriers.
Źródło:
Acta Physica Polonica A; 2005, 108, 5; 755-760
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 174

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