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    Wyświetlanie 1-13 z 13
    Tytuł:
    Adaptive Modulation Amplitude in 2D Spectral-Spatial EPR Imaging
    Autorzy:
    Czechowski, T.
    Samolej, A.
    Baranowski, M.
    Boś-Liedke, A.
    Chlewicki, W.
    Jurga, J.
    Tadyszak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030422.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.-v
    42.30.Wb
    75.20.-g
    42.30.Va
    Opis:
    A study concerning the image quality in Electron Paramagnetic Resonance Imaging (EPRI) in 2D spectral-spatial (2D SSI) experiments is presented. The aim of the measurements is to improve the signal to noise ratio (SNR) of the projections by applying a more consciously selected modulation amplitude parameter. Data is gathered by applying three constant and one adaptive modulation amplitude. The three fixed modulation amplitudes values are leading to undermodulated (0.01 G), partially overmodulated (0.15 G) and fully overmodulated (0.65 G) projections. The study demonstrates the advantages of the adaptive method, which involves selecting different and dependent on cosine function modulation amplitudes for each projection. The study is performed on a phantom containing four tubes of LiPc and TCNQ, characterized by a different peak to peak linewidth and spin concentration.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 710-712
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geometrically Frustrated Kagome Lattice with Chemical Disorder
    Autorzy:
    Szymczak, R.
    Baran, M.
    Fink-Finowicki, J.
    Krzymanska, B.
    Aleshkevych, P.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813765.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Cr
    75.20.-g
    Opis:
    The effect of nonmagnetic $Mg^{2+}$ and magnetic $Co^{2+}$ doping in Kagome compounds was investigated using DC magnetic susceptibility. The main effect of doping is to change the crystal field parameters. It was shown that $Co^{2+}$ doping increases considerably crystal field parameters in $Ni_3V_2O_8$ while doping with nonmagnetic $Mg^{2+}$ ions decreases considerably crystal field parameters in $Co_3V_2O_8$ crystals.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 413-416
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport and Magnetic Studies of New Mixed-Valence Compounds: K$\text{}_{3}$Cu$\text{}_{8}$Se$\text{}_{6}$, KCu$\text{}_{3}$Se$\text{}_{2}$, K$\text{}_{3}$Cu$\text{}_{8}$Te$\text{}_{6}$ and BaCuS$\text{}_{3-x}$
    Autorzy:
    Jacyna-Onyszkiewicz, I.
    Sidowski, M.
    Starodub, W.
    Ratuszna, A.
    Robaszkiewicz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955832.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.-g
    71.30.+h
    Opis:
    New mixed-valent copper chalcogenides BaCuS$\text{}_{3-x}$ and K$\text{}_{3}$Cu$\text{}_{8}$X$\text{}_{6}$ with X=Se or Te and KCu$\text{}_{3}$Se$\text{}_{2}$, with chemical patterns corresponding to the recently investigated K$\text{}_{3}$Cu$\text{}_{8}$S$\text{}_{6}$ and KCu$\text{}_{3}$S$\text{}_{2}$, were synthesized. For these new samples the results of resistivity and magnetic susceptibility measurements are presented. For BaCuS$\text{}_{3-x}$, K$\text{}_{3}$Cu$\text{}_{8}$Se$\text{}_{6}$ and KCu$\text{}_{3}$Se$\text{}_{2}$ the metal-insulator transition is observed with the low temperature phase being metallic, which is untypical, whereas K$\text{}_{3}$Cu$\text{}_{8}$Te$\text{}_{6}$ is a metal in the investigated temperature range. The temperature dependence of magnetic susceptibility of the studied samples testifies to their diamagnetic or weakly paramagnetic behaviour.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 405-408
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low-Temperature Structural Phase Transition in Monoclinic RbDy(WO$\text{}_{4}$)$\text{}_{2}$ Crystal
    Autorzy:
    Borowiec, M. T.
    Dyakonov, V.
    Kamenev, V.
    Nabiałek, A.
    Prokhorov, A.
    Szymczak, H.
    Załęski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968975.pdf
    Data publikacji:
    1998-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.-v
    75.20.-g
    Opis:
    The ESR spectrum of Dy$\text{}^{3+}$ ion in the low-symmetry RbDy(WO$\text{}_{4}$)$\text{}_{2}$ crystal has been studied in the temperature region of T=4.2 ÷ 30K. The ESR linewidth was found to increase from 130 mT up to the maximum value of 190 mT at T=9K and then to decrease down to 150 mT at 4.2K. The components of the g-tensor change considerably without change of their spatial orientation in the temperature range from 12K to 7 K: g$\text{}_{z}$=2.5, g$\text{}_{x}$≈0, g$\text{}_{y}$=1.41 at T>12 K; g$\text{}_{z}$=1.53, g$\text{}_{x}$≈0, g$\text{}_{y}$=1.2 at T<7K. The observed λ-shaped behaviour of absorption linewidth and the decrease in the g-factor are assumed to be due to the low-temperature structural phase transition (T$\text{}_{SPT}$≈9 K). The width of the transition area is of about 5K. It is suggested that the symmetry of high- and low-temperature phases is identical.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 1; 71-77
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aspects of Magnetism in Heavy-Electron Metals
    Autorzy:
    Ott, H. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1860764.pdf
    Data publikacji:
    1994-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.-g
    75.20.Hr
    75.30.-m
    75.30.Mb
    Opis:
    For some time it was believed that heavy-mass electrons at low temperatures, in special rare-earth and actinide compounds, were due to a particular suppression of magnetic order in these materials. Various experiments reveal, however, that magnetic order may occur from a heavy-electron state and that also a heavy-electron state may develop in the presence of a magnetically-ordered matrix. Even in materials with no sign of a cooperative phase transition, microscopic experimental probes give evidence for strong magnetic correlations, involving only very tiny (< 10^{-1} μ_{B}) ordered moments, however. All these experimental observations indicate that the heavy-electron state cannot always be regarded as a simple Fermi liquid in the usual sense. Various interactions of similar strength need to be considered. It is suggested that the balance of these interactions may lead to electronic inhomogeneities in k space. Both in magnetically-ordered or superconducting systems, unexpected electronic degrees of freedom appear to exist. In other cases experimental observations suggest magnetic inhomogeneities in real space which are not simply due to chemical inhomogeneities. Different examples of these various possibilities are demonstrated and discussed.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 1; 7-19
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Paramagnetism of Cu_3RE_2W_4O_{18} Semiconductors (RE = Gd, Dy-Er)
    Autorzy:
    Groń, T.
    Tomaszewicz, E.
    Duda, H.
    Mazur, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399149.pdf
    Data publikacji:
    2013-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Pp
    75.20.-g
    75.30.Cr
    Opis:
    $Cu_3RE_2W_4O_{18}$ tungstates (RE = Gd, Dy-Er) are paramagnets in the temperature range 4.2-300 K visible also in the absence of the energy losses in the curve of the imaginary part of magnetic susceptibility, χ". The negative values of the paramagnetic Curie-Weiss temperature, θ, may suggest the weak antiferromagnetic coupling below 4.2 K. The temperature independent component of magnetic susceptibility has a positive value indicating a domination of the Van Vleck contribution. Calculations of the effective number of the Bohr magnetons revealed that the orbital contribution to the magnetic moment comes mainly from the $RE^{3+}$ ions.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 5; 885-887
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetism in $NdMnO_{3+δ}$ Studied by the Single Crystal Neutron Diffraction
    Autorzy:
    Mihalik, M.
    Maťaš, S.
    Vavra, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368766.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.-g
    75.30.-m
    75.50.Gg
    Opis:
    We present the single crystal neutron diffraction experiment performed on the $NdMnO_{3+δ}$ compound. The aim of the experiment was to study/revisit the magnetic structure of the compound. We have confirmed the ordering of Mn sublattice below $T_{N}$=85.5 K and confirmed that the Nd sublattice orders below $T_{1}$ ≈ 20 K with Nd moments aligned parallel to the b-axis.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 284-285
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diluted Magnetic Semimetals - Beyond Heisenberg Coupling
    Autorzy:
    Wilamowski, Z.
    Story, T.
    Jantsch, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931949.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.-g
    75.30.Hx
    76.20.+q
    Opis:
    We analyse effects which cannot be explained assuming the isotropic Heisenberg form of sp-d or of the indirect d-sp-d (RKKY) coupling. Resonance line broadening, a line shift and an enhancement of the magnetic anisotropy in diluted magnetic semimetals are discussed.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 189-192
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superparamagnetic-Like Behaviour in RE$\text{}_{2}$WO$\text{}_{6}$ Tungstates (Where RE = Nd, Sm, Eu, Gd, Dy, Ho and Er)
    Autorzy:
    Groń, T.
    Tomaszewicz, E.
    Urbanowicz, P.
    Duda, H.
    Mydlarz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048133.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.-g
    75.25.Dk
    75.30.Cr
    73.61.Ng
    Opis:
    The magnetization isotherms were used to study the superparamagnetic-like behaviour in polycrystalline (powder) RE$\text{}_{2}$WO$\text{}_{6}$ tungstates (where RE = Nd, Sm, Eu, Gd, Dy, Ho and Er). The magnetization isotherms of the majority tungstates under study revealed both the spontaneous magnetic moments and hysteresis characteristic for the superparamagnetic-like behaviour with blocking temperature T$\text{}_{B}$ ≈ 30 K except the Sm$\text{}_{2}$WO$\text{}_{6}$ and Eu$\text{}_{2}$WO$\text{}_{6}$ compounds.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 708-710
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Study of the Fe Coated by Au Nanoparticles
    Autorzy:
    Zeleňáková, A.
    Kováč, J.
    Kavečanský, V.
    Zeleňák, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813874.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.Df
    68.37.Lp
    75.20.-g
    75.30.Cr
    Opis:
    Nanosized iron-gold magnetic nanoparticles with an average particle size 10 nm were prepared by a reverse micelle method. The magnetic properties measurements of DC and AC magnetization confirm behaviour typical of a superparamagnetic system, such as the irreversibility of the zero-field-cooled and field-cooled curves, the frequency dependence of a blocking temperature $T_B$, and revealing of coercivity H_C below blocking temperature. The quantitative analysis of AC susceptibility due to value of parameter $C_1$ = Δ$T_B$/($T_B$ Δ log f)=0.0242 confirming the existence of inter-particle interaction in our system.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 533-536
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exchange Bias in Iron-Oxide Particles Nanocasted in Periodic Porous Silica
    Autorzy:
    Zeleňáková, A.
    Kováč, J.
    Zeleňák, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810584.pdf
    Data publikacji:
    2009-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.Df
    68.37.Lp
    75.20.-g
    75.30.Cr
    Opis:
    Iron-oxide nanoparticles were nanocasted in the periodic mesoporous silica matrix, consisting of two-dimensional hexagonally ordered channel system with the mean diameter of the channels about 7 nm. The magnetic measurements of dc magnetization confirm behavior typical of a superparamagnetic system, such as the irreversibility of the zero-field-cooled and field-cooled curves, presence of a maximum in zero-field-cooled curve related with blocking temperature $T_C$ and revealing of coercivity $H_C$ below $T_C$. The existence of negative exchange bias effect below $T_C$ was confirmed in our system represented by value of exchange bias field $H_{EB}$=-970 Oe measured at the temperature 2 K.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 1; 357-359
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Study of Nanocrystalline TiB₂, TiC, B₄C Powders Doped to AISI 316L Austenitic Steel
    Autorzy:
    Bodziony, T.
    Kaczmarek, S.
    Biedunkiewicz, A.
    Leniec, G.
    Figiel, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032403.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.55.Jg
    75.20.-g
    75.50.-y
    75.50.Bb
    76.30.-v
    Opis:
    The investigations into ferromagnetic resonance and magnetic susceptibility of nanocrystalline TiB₂, TiC, and B₄C powders (Ti-B-C system) doped to AISI 316L austenitic steel with different amounts (3 vol.%, 5 vol.% and 7 vol.%) have been carried out. The ferromagnetic resonance spectra were recorded in the temperature range from helium up to room temperature. The three tested composite samples contain a number of magnetic phases in different proportions. They reveal a structure originating from several different complex magnetic centers. The composites revealed such magnetic phenomena as paramagnetism, (anti)ferromagnetism, and superparamagnetism. Magnetic susceptibility investigations supported the ferromagnetic resonance studies and their analysis. Magnetic properties of the TiB₂, TiC, B₄C powders doped to AISI steel may play important role in further possible applications of these composite systems.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 62-68
    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
      Wyświetlanie 1-13 z 13

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