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Tytuł:
Volume Effect on the Magnetism of $Fe_{3-x}Cr_{x}Al$
Autorzy:
Go, A.
Pugaczowa-Michalska, M.
Dobrzyński, L.
Powiązania:
https://bibliotekanauki.pl/articles/1810453.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
Opis:
Magnetic properties of $Fe_{3-x}Cr_{x}Al$ alloys depend strongly on the unit cell volume. Purpose of this work is to investigate the dependence of the total and local magnetic moments on the lattice constant using the self-consistent spin-polarised TB-LMTO method.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 191-193
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure of $Mg_2Ni_{1-x}Cu_{x}$
Autorzy:
Jezierski, A.
Jurczyk, M.
Szajek, A.
Powiązania:
https://bibliotekanauki.pl/articles/1810475.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Mb
71.20.Be
Opis:
Nanocrystalline $Mg_{2}Ni$ doped alloys are good materials for hydrogen storage. In this work we present the influence of the chemical disorder on the electronic structure of $Mg_{2}Ni_{1-x}Cu_{x}$ alloys for 0 < x < 0.2. The electronic structure was calculated by ab initio full potential scalar relativistic local-orbital method in the coherent potential approximation. We observe the change of the density of states near the Fermi energy.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 223-225
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the boron addition on the structure of the Ni-Mn-Co-In alloys
Autorzy:
Prusik, K.
Matyja, E.
Zubko, M.
Kubisztal, M.
Chrobak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1153865.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Lp
71.20.Be
Opis:
Series of Ni_{45.5-x}Co_{4.5}Mn_{36.6}In_{13.4}B_{x} (at.%, x=0, 0.05, 0.1, 0.5, 1.0) polycrystalline magnetic shape memory alloys produced by the induction melting were examined in terms of the structure and transition temperatures. The structure of the alloys was determined by the X-ray diffraction and transmission electron microscopy. Scanning electron microscopy and electron backscattering diffraction techniques were applied to obtain the microstructure and texture of alloys. Boron addition promotes nucleation of the second Co-rich and In-poor phase as well as causes decrease of the martensitic transformation temperatures.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1023-1025
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ni_2FeSi Heusler Glass Coated Microwires
Autorzy:
Galdun, L.
Ryba, T.
Prida, V.
Hernando, B.
Zhukova, V.
Zhukov, A.
Vargová, Z.
Varga, R.
Powiązania:
https://bibliotekanauki.pl/articles/1032750.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
72.20.Lp
Opis:
We report on fabrication, structural and magnetic properties of novel Heusler-type glass coated Ni₂FeSi microwires that were prepared by the Taylor-Ulitovsky method, having a metallic nucleus diameter about 3.9 μm and total sample diameter of 39 μm. This single step and low cost fabrication technique offers to prepare up to km of glass-coated microwires starting from few g of cheap elements for diverse applications. The X-ray diffraction data from the metallic nucleus indicates L2₁ crystalline structure (a=5.563 Å), with a possible DO3 disorder. Magnetic measurements determined the Curie temperature well above the room temperature (770 K) together with uniform easy magnetization axis of the metallic core, which predisposes this material to a suitable candidate for spintronic applications.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 851-853
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure and Ordering Degree in $Fe_3Al$ Alloy Doped with Transition Metals. Ab Initio Study
Autorzy:
Go, A.
Dobrzyński, L.
Powiązania:
https://bibliotekanauki.pl/articles/1427323.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
75.50.Bb
Opis:
$Fe_3Al$ alloy crystallizes in $DO_3$-type structure. In the perfectly ordered alloy there are two nonequivalent sublattices (A,C) and B, which are occupied by Fe atoms, whereas all D sites are taken by metalloid. Such perfect ordering is, however, difficult to achieve experimentally, and some disorder between B-D as well as (A,C)-D sublattices typically appears in real samples. This disorder modifies strongly electronic structure and magnetic properties. The aim of this contribution is to investigate total energy dependence of atomic exchange of sites between B-D and (A,C)-D positions in $Fe_3Al$ as well as in alloys doped with transition metals using ab-initio technique. Furthermore, dependence of electronic and magnetic properties of $Fe_3Al$-based alloys on the crystallographic ordering is thoroughly investigated.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1124-1127
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Mn doping on magnetic and structural properties of Co₂FeSi Heusler alloy
Autorzy:
Galdun, L.
Ryba, T.
Kováč, J.
Prida, V.
Hernando, B.
Vargová, Z.
Varga, R.
Powiązania:
https://bibliotekanauki.pl/articles/1054765.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
72.20.Lp
Opis:
We have studied the effect of Mn doping on structural and magnetic properties of Co₂FeSi Heusler alloy. Co₂FeSi, Co₂Mn_{0.25}Fe_{0.75}Si and Co₂Mn_{0.5}Fe_{0.5}Si alloys were prepared by melt spinning technique which offers fast and simple production of large amount of materials in a single production step. The rapid quenching method provides an opportunity to prepare Heusler alloys with highly ordered L2₁ structure confirmed by X-ray analysis in all the samples. Magnetic measurements revealed high Curie temperatures (>1000 K) and well defined easy magnetization plane parallel with the ribbon plane. Those attributes predispose given samples for applications in spintronics.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 866-868
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ab Initio Study of Electronic Structure and Magnetic Properties of $Gd(Ni_{1-x}Fe_x)_3$ Alloys
Autorzy:
Deniszczyk, J.
Woźniakowski, A.
Borgieł, W.
Powiązania:
https://bibliotekanauki.pl/articles/1427490.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
79.60.Bm
Opis:
We present the ab initio investigations of the electronic and magnetic properties of magnetocaloric $Gd(Ni_{1-x}Fe_x)_3$ alloys. To simulate fractional concentrations the supercell approach was implemented and different configurations of iron atoms were considered. Energetical analysis of site preference and magnetic order was performed. The concentration dependence of the averaged total and local magnetic moments and of the valence band photoemission spectra are presented and discussed in reference to experimental data.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1156-1158
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure of $Sm(Ni_{1-x}Co_{x})_3$ Alloys - XPS and ab initio Study
Autorzy:
Majtyka, A.
Sikora, M.
Blachiński, D.
Chełkowska, G.
Deniszczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1397014.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
79.60.Bm
Opis:
The band structure investigations for $Sm(Ni_{1-x}Co_{x})_3$ alloys by means of X-ray photoelectron spectroscopy (XPS) and an ab initio density functional theory (DFT) calculations are presented. The aim was to determine an effect of Ni/Co substitution on the electronic structure of the alloys. Investigations have shown that the Ni/Co substitution results in a reconstruction of the valence band (VB), especially the intensity near the Fermi level decreases with Co content. An ab initio simulated XPS VB spectra agree qualitatively with experimental ones with the exception of the Sm-4f sub-spectra where the multiplet decomposition is observed. Calculations shown that variation of magnetization in $Sm(Ni_{1-x}Co_{x})_3$ is driven mainly by the Ni/Co-3d and Sm-5d states polarization and increases linearly with rising Co content.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 673-675
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Alloying on Magnetism and Electronic Structure of $Gd(In_{1-x}Snₓ)₃$ System - ab initio Study
Autorzy:
Deniszczyk, J.
Bajorek, A.
Chełkowska, G.
Zipper, E.
Powiązania:
https://bibliotekanauki.pl/articles/1386400.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
79.60.Bm
Opis:
We present the results of ab initio study of electronic and magnetic properties of $Gd(In_{1-x}Snₓ)₃$ alloys carried out with the use of FP-LAPW method. Our precise ab initio calculations for the first time uniquelly confirmed experimentally based predictions that the ground state magnetic structure of the alloys is antiferromagnetic and that upon the In/Sn substitution the magnetic structure undergo transition, changing the antiferromagnetic ordering from the (π00)-type for the GdSn₃ compound to the (ππ0)-type for the GdIn₃ one. Moreover, calculations gave an explanation of the oscillatory variation of density of states at Fermi level indicated by XPS measurements.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 427-429
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ab Initio Study of Electronic and Magnetic Structure and Structural Phase Transition of $(Fe_{1 - x}Mn_{x})_2P_{1 - y}Ge_{y}$ Alloys
Autorzy:
Deniszczyk, J.
Woźniakowski, A.
Kolano, R.
Kolano-Burian, A.
Powiązania:
https://bibliotekanauki.pl/articles/1427520.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
75.20.Hr
Opis:
The paper presents results of the ab initio electronic structure calculations performed for the $(Fe_{0.5}Mn_{0.5})_2P_{0.67}Ge_{0.33}$ alloy, a member of $(Fe_{1 - x}Mn_{x})_2P_{1 - y}Ge_{y}$ family of alloys showing a giant magnetocaloric effect. Calculations confirmed the strong relationship between the magnetic state and crystal structure of the alloy. To investigate the isostructural phase transition driven by external magnetic field observed in $(Fe_{0.9}Mn_{1.1})P_{0.8}Ge_{0.2}$ we utilized the fixed spin moment approach. Total energy analysis confirmed the occurrence of isostructural phase transition.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1162-1164
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical Foundation for the Hume-Rothery Electron Concentration Rule for Structurally Complex Alloys
Autorzy:
Mizutani, U.
Sato, H.
Inukai, M.
Zijlstra, E.
Powiązania:
https://bibliotekanauki.pl/articles/1382955.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
71.20.Lp
71.15.Mb
Opis:
An electron concentration parameter, expressed as the number of itinerant electrons per number of atoms N in a structural unit cell of an alloy, e/uc, is a useful parameter that can be used in interpreting the origin of a band structure pseudogap often evident at the Fermi level for structurally complex metallic alloy phases. It can be expressed in terms of the interference condition e/uc=$π/3[|G|_{c}^2]^{3/2}$, where $|G|_{c}^2$ is the square of the critical reciprocal lattice vector associated with the specific set of lattice planes interfering with electrons at the Fermi level. This parameter is similar to the well-known Hume-Rothery electron concentration parameter e/a, which represents the number of electrons per atom and is linked with e/uc through the relation e/uc = N(e/a). We have demonstrated that certain complex metallic alloy structures appear to be stable at or near certain values of e/a. We show that the e/a=1.60 rule holds for the sub-group of gamma-brasses with space group I4̅3m and Pearson symbol cI52, the e/a=4.34 rule for skutterudite compounds with Im3̅ and cI32, the e/a=2.74 rule for $Al_6TM$ (TM = Mn, Tc, Re, Fe, and Ru) compounds with Cmcm and oC28, the e/a=1.62 rule for the sub-group of the Heusler compounds with Fm3̅m and cF16, and the e/a=2.09 rule for the sub-group of Zintl compounds $MX_1$ (M = Li and Na, $X_1$ = Al, Ga, In, and Tl) with Fd3̅m and cF32. The e/a rule holds in sub-groups of isostructural compounds, regardless of the degree of orbital hybridizations and the polarity involved.
Źródło:
Acta Physica Polonica A; 2014, 126, 2; 531-534
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic Properties of Cu Doped $(80-x)Sb_2O_3-20Li_2O-xMoO_3$ Glasses
Autorzy:
Petkova, P.
Touiri, H.
Soltani, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399682.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
71.23.Cq
78.20.-e
Opis:
The antimony oxide as part of the heavy metal oxide glasses is attractive to researchers in recent years. The new antimony oxide glasses have been successfully synthesized using silica crucible in the ternary system for undoped and doped $(80-x)Sb_2O_3-20Li_2O-xMoO_3$ (x = 20, 30 mol.%) doped with 0.1 mol.% $CuO_2$. The optical characterization in the visible spectral region has been carried out on the doped glasses. The role of the Jahn-Teller effect in Cu doped glasses is determined and the electron transitions in these cations have been determined.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 205-206
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure and Magnetic Properties of $Ni_2MnGa_{1-x}Ge_{x}$ and Disordered $Ni_{2}MnSn$ Heusler Alloys
Autorzy:
Pugaczowa-Michalska, M.
Jezierski, A.
Dubowik, J.
Kaczkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1810489.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Mb
71.20.Be
71.20.-b
Opis:
In this work we present the influence of atomic disorder on the electronic and magnetic properties of $Ni_{2}MnGa_{1-x}Ge_{x}$ and $Ni_{2}MnSn$ Heusler alloys. Ab initio band calculations were performed for the experimental lattice parameters. We applied SPR-KKR-CPA methods in the local spin density approximation.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 241-243
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Electronic Structure and Specific Heat of $YNi_4Si$
Autorzy:
Pugaczowa-Michalska, M.
Falkowski, M.
Kowalczyk, A.
Timko, M.
Reiffers, M.
Mihalik, M.
Šebek, J.
Šantava, E.
Powiązania:
https://bibliotekanauki.pl/articles/1813671.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
71.20.-b
65.40.-b
Opis:
The studies of the electronic structure and the specific heat of $YNi_4Si$ are reported. Below the Fermi energy $(E_F)$ the density of states contains mainly the 3d states of Ni, which hybridized with 4d states of Y and 3p states of Si. The theoretical electronic specific heat coefficient (12.32 mJ/(mol $K^2$)) obtained for equilibrium lattice parameters and the experimental value (13 mJ/(mol $K^2$)) are in a reasonable agreement.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 323-326
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling Thermal Expansion of $Ni_{2}MnGe$
Autorzy:
Pugaczowa-Michalska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1810454.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Lp
71.20.Be
65.40.De
Opis:
The present study of $Ni_{2}MnGe$ is focused on describing the thermal properties of the alloy in the framework of first-principles electronic structure calculations coupled with a Debye treatment of the vibrating lattice. The electronic structure of $Ni_{2}MnGe$ has been studied using the full-potential nonorthogonal local-orbital minimum basis method. Two approximations for Grüneisen parameter γ, i.e. Slater's and Dugdale and MacDonald's expressions were assumed.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 194-196
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interatomic Pair Interaction in Liquid Transition Metals
Autorzy:
Dubinin, N.
Powiązania:
https://bibliotekanauki.pl/articles/1808052.pdf
Data publikacji:
2009-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.25.Mv
71.15.Dx
71.20.Be
Opis:
The Wills-Harrison pair interaction is investigated for liquid Fe on the base of the introduced relation between parameters of the model pseudopotential and d-electron characteristics. It is shown that the procedure suggested leads to the significant shift of the first minimum of the pair potential and increases the softness of its repulsive part.
Źródło:
Acta Physica Polonica A; 2009, 115, 4; 783-785
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical Description of SMA Actuator Dynamics based on Fermi-Dirac Function
Autorzy:
Kluszczyński, K.
Kciuk, M.
Powiązania:
https://bibliotekanauki.pl/articles/1033044.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.85.St
71.20.Gj
71.20.Be
Opis:
The paper deals with possible application of the very promising SMART material - shape memory alloy. At the beginning the laboratory stand for investigation on dynamic behaviour of a SMA linear actuator is presented and results of measurements for the chosen SMA actuator F2000 are depicted and discussed. In the next stage the authors propose to use the so-called Fermi-Dirac function for description of SMA linear actuator dynamics. Applying this function for determining basic performance curve: shortening Δ L versus time t for different loads F requires proper modification of the Fermi-Dirac function and its conversion in the one-parameter family (with parameter F). Coefficients of this family are determined with the help of Hooke-Jeeves optimization algorithm and on the basis of experimental findings separately for activation and deactivation process. The both derived expressions were validated by additional laboratory investigations. Finally, the elaborated descriptions was employed in design procedure of a robot gripper. It was shown that the results of measurements for the gripper prototype are in satisfactory agreement with the results of calculations.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1274-1279
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Small Pt Doping on the Electronic Structure of NiMnSb Half-Heusler Alloys
Autorzy:
Pugaczowa-Michalska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2035739.pdf
Data publikacji:
2003-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
71.20.Be
75.50.-y
Opis:
The effect of small Pt doping on the electronic and magnetic properties of NiMnSb compound were studied using the spin-polarised tight-binding linear muffin-tin orbital method. The electronic structure of half-Heusler alloys depends on the relative arrangement of the atoms in the unit cell, changing from half-metal to metal. The local ordering drastically influences the value of the band gap. The self-consistent band calculations were performed for the experimental lattice constant and for the lattice parameter estimated from the minimum of the total energy.
Źródło:
Acta Physica Polonica A; 2003, 103, 4; 393-402
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Core-Hole Screening on Spin-Polarised Auger Spectra from Ferromagnetic Ni
Autorzy:
Wegner, T.
Potthoff, M.
Nolting, W.
Powiązania:
https://bibliotekanauki.pl/articles/2013223.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.20.Fv
71.20.Be
75.60.Ej
Opis:
We calculate the spin- and temperature-dependent local density of states for ferromagnetic Ni in the presence of a core hole at a distinguished site in the lattice. Correlations among the valence electrons and between valence and core electrons are described within a multi-band Hubbard model which is treated by means of second-order perturbation theory around the Hartree-Fock solution. The core-hole potential causes strong screening effects in the Ni valence band. The local magnetic moment is found to be decreased by a factor of 5-6. The consequences for the spin polarisation of CVV Auger electrons are discussed.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 567-570
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetoluminescence Studies of GaN:Fe
Autorzy:
Niedźwiadek, A.
Wysmołek, A.
Wasik, D.
Potemski, M.
Szczytko, J.
Kamińska, M.
Twardowski, A.
Łucznik, B.
Pastuszka, B.
Grzegory, I.
Powiązania:
https://bibliotekanauki.pl/articles/2047373.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Et
71.55.Eq
71.20.Be
Opis:
We report on magneto-optical studies on iron doped GaN crystals grown using hydride vapor phase epitaxy method on bulk GaN substrate. The investigated samples showed an intensive 1.3 eV luminescence band, characteristic of Fe$\text{}^{3+}$(d$\text{}^{5}$) center in GaN. A high quality of the investigated samples allowed us to observe a well-resolved fine structure of intracenter transitions between $\text{}^{4}$T$\text{}_{1}$(G) and $\text{}^{6}$A$\text{}_{1}$(S) states, consisting of four sharp no-phonon lines. All the observed no-phonon lines showed pronounced splittings in magnetic field. From the analysis of the magneto-optical data, the structure of split $\text{}^{4}$T$\text{}_{1}$(G) multiplet in the magnetic field applied along c-axis of GaN crystals was established.
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 177-182
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Comparison of the Valence Band Structure of Bulk and Epitaxial GeTe-based Diluted Magnetic Semiconductors
Autorzy:
Pietrzyk, M.
Kowalski, B.
Orlowski, B.
Knoff, W.
Story, T.
Dobrowolski, W.
Slynko, V.
Slynko, E.
Johnson, R.
Powiązania:
https://bibliotekanauki.pl/articles/1538868.pdf
Data publikacji:
2010-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.-i
71.20.Mq
71.20.Be
Opis:
In this work we present a comparison of the experimental results, which have been obtained by the resonant photoelectron spectroscopy for a set of selected diluted magnetic semiconductors based on GeTe, doped with manganese. The photoemission spectra are acquired for the photon energy range of 40-60 eV, corresponding to the Mn 3p → 3d resonances. The spectral features related to Mn 3d states are revealed in the emission from the valence band. The Mn 3d states contribution manifests itself in the whole valence band with a maximum at the binding energy of 3.8 eV.
Źródło:
Acta Physica Polonica A; 2010, 117, 2; 293-295
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical Study of Substitution of Si for Ge in Mn$\text{}_{5}$Ge$\text{}_{3}$
Autorzy:
Siberchicot, B.
Henrion, R.
Toboła, J.
Powiązania:
https://bibliotekanauki.pl/articles/1956494.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
75.50.Cc
75.10.Lp
Opis:
The substitution of silicon for germanium in Mn$\text{}_{5}$Ge$\text{}_{3}$ leads to a decrease in the magnetization for x < 0.7 and then to phase transition toward a non-collinear antiferromagnetic order for Mn$\text{}_{5}$Si$\text{}_{3}$. The magnetic properties of Mn$\text{}_{5}$Ge$\text{}_{3}$ and Mn$\text{}_{5}$(Ge$\text{}_{0.5}$Si$\text{}_{0.5}$)$\text{}_{3}$ are analyzed by means of band structure calculations.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 467-470
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Studies of S=1 Heisenberg Planar Antiferromagnetic Chain Ni(C$\text{}_{11}$H$\text{}_{10}$N$\text{}_{2}$O)$\text{}_{2}$Ni(CN)$\text{}_{4}$
Autorzy:
Čizmár, E.
Černák, J.
Orendáč, M.
Herrmannsdörfer, T.
Feher, A.
Powiązania:
https://bibliotekanauki.pl/articles/2013230.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Cx
71.20.Be
75.50.Ee
Opis:
In this paper we discuss the results of experimental studies of specific heat and magnetic susceptibility of chain compound Ni(C$\text{}_{11}$H$\text{}_{10}$N$\text{}_{2}$O)$\text{}_{2}$Ni(CN)$\text{}_{4}$. We have observed a Schottky type anomaly at T=2.2 K in a temperature dependence of specific heat and the compound was identified as a S=1 Heisenberg antiferromagnetic chain with the subcritical exchange coupling D/k$\text{}_{B}$=5 K, D/|J|=5.2 and the strong in-plane anisotropy E/k$\text{}_{B}$=2.8 K. It has been found that the in-plane anisotropy affects the region of validity of a diluted exciton model [1] and a strong coupling model [2] for S=1 Heisenberg chains with the strong planar anisotropy. The analysis suggests that the in-plane anisotropy should be considered in any attempt to find a compound potentially located in the boundary of Haldane and "large-D" phases.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 579-582
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Noncollinear Magnetic Order on the Hyperfine Interactions in $Pt_{3}Fe$
Autorzy:
Woźniakowski, A.
Deniszczyk, J.
Szymański, K.
Powiązania:
https://bibliotekanauki.pl/articles/1506637.pdf
Data publikacji:
2011-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
71.20.Lp
75.50.Bp
76.80.+y
Opis:
The investigations of the hyperfine interactions in $Pt_{3}Fe$ with the noncollinear magnetic order by means of ab initio methods are presented. It is shown that the ground state magnetic order of $Pt_{3}Fe$ is of noncollinear character. Electric field gradient and hyperfine magnetic field at $\text{}^{57}Fe$ nucleus were calculated and their dependence on the strength of Coulomb correlation interaction is discussed. The calculated values of electric field gradient correspond with the experimental data and the best agreement was found when the enhanced Coulomb correlation interaction for 3d-states of Fe was considered. Lattice, local valence electron (3d, 4p) and weakly bound 3p semicore electron contributions to electric field gradient are separated out and discussed.
Źródło:
Acta Physica Polonica A; 2011, 119, 1; 65-67
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Study of Compressibility of $Ni_2MnX$ (X=In, Sn, Sb) Heusler Alloys
Autorzy:
Pugaczowa-Michalska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813962.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
71.20.Be
75.20.En
75.50.Cc
Opis:
The present study is focused on the compressibility of $Ni_2MnX$ (X = In, Sn, Sb) Heusler alloys, which were investigated from the first principles. The study of the pressure effect on the magnetic properties of $Ni_2MnX$ (X = In, Sn, Sb) predicted the decrease in the total magnetic moment from ambient pressure to pressure above 20 GPa.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 629-632
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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