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    Wyświetlanie 1-11 z 11
    Tytuł:
    Fabrication and Study of $GdMnO_{3}$ Multiferroic Thin Films
    Autorzy:
    Andreev, N.
    Abramov, N.
    Chichkov, V.
    Pestun, A.
    Sviridova, T.
    Mukovskii, Ya.
    Powiązania:
    https://bibliotekanauki.pl/articles/1550592.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    75.50.Ee
    75.70.Ak
    77.90.+k
    Opis:
    Laboratory technology of $GdMnO_{3}$ thin film fabrication was elaborated. Samples of $GdMnO_{3}$ were fabricated at $NdGaO_{3}$ substrate by magnetron sputtering using off-axis scheme. Structure and phase content of the samples obtained were studied as well as their magnetic properties. The surface topography of the films was observed by atomic force microscopy. Presence of peculiarities at the temperature dependences of magnetic susceptibility points at magnetic phase transitions in $GdMnO_{3}$, which were found before in the single crystals. This fact jointly with X-ray data shows that at definite fabrication regimes one can obtain the multiferroics thin film $GdMnO_{3}$ modification, and the film quality permits to carry out accurate study of the compound in question.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 218-220
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Pressure on Magnetic States of Easy-Plane Antiferromagnets
    Autorzy:
    Mitsay, Yu. N.
    Fridman, Yu. A.
    Bairamalieva, G. A.
    Alexeev, C. N.
    Kochmański, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964223.pdf
    Data publikacji:
    1997-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    75.50.Ee
    Opis:
    The phase H-P-β diagram of an easy-plane strongly anisotropic antiferromagnet is studied. It is shown that in such a system a realization of the phase with the nonmagnetic order parameter, the so-called quadruple phase, is possible. The realization of this phase is caused by several purely quantum effects, moreover the mechanism of its appearance differs in principle from that of the antiferromagnet or ferromagnet. The possibility of the disappearance of the angular phase (the so-called quadruple ferromagnetic phase) is also shown.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 6; 1111-1120
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of RCuGe (R=Pr, Nd, Gd, Tb, Dy, Ho, Er) Compounds
    Autorzy:
    Baran, S.
    Leciejewicz, J.
    Stüsser, N.
    Szytuła, A.
    Tomkowicz, Z.
    Zygmunt, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964562.pdf
    Data publikacji:
    1997-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Cr
    75.30.Kz
    75.50.Ee
    Opis:
    The magnetic properties including the magnetic structure were determined by magnetometric and neutron diffraction measurements of the polycrystalline samples. RCuGe compounds are antiferromagnets at low temperatures, with T$\text{}_{N}$ ranging from 2.2 K for R = Pr to 17 K for R = Gd. The external magnetic field causes a change in the type of the magnetic ordering from antiferro- to ferromagnetic state. From the neutron diffraction data the magnetic structure of all RCuGe compounds are determined. In the case of ErCuGe below T$\text{}_{N}$ an additional phase transition is observed. The obtained experimental data are discussed in terms of an exchange interaction of the RKKY-type and crystalline electric field.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 2; 271-275
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Competing Magnetic Interactions in Zn$\text{}_{3}$Fe$\text{}_{4}$V$\text{}_{6}$O$\text{}_{24}$ Studied by Electron Paramagnetic Resonance
    Autorzy:
    Zolnierkiewicz, G.
    Guskos, N.
    Typek, J.
    Blonska-Tabero, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046813.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.-v
    75.50.Dd
    75.50.Ee
    Opis:
    A multicomponent vanadate M$\text{}_{3}$Fe$\text{}_{4}$V$\text{}_{6}$O$\text{}_{24}$ sample with non-magnetic M = Zn(II) ions was synthesized by the solid state reaction method using stoichiometric mixtures of the 80mol% FeVO$\text{}_{4}$ and 20mol% Zn$\text{}_{3}$(VO$\text{}_{4}$)$\text{}_{2}$. The temperature dependence of the EPR spectra was performed in the 90-280 K temperature range. The resonance field and the integrated intensity of the EPR line showed minimum value of both parameters at≈200 K. It is suggested that a part of the sample is displaying tendency to form an antiferromagnetic ordered state (or the magnetic clusters) above this temperature while below the ferromagnetic interaction of the main part of material is dominating. This behaviour is attributed to the inherent magnetic inhomogeneity of the system due to the presence of the ferromagnetic or antiferromagnetic spin clusters.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 675-679
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic Properties of Geometrically Frustrated S=1/2 XY Antiferromagnet $Er_{2}Sn_{2}O_{7}$
    Autorzy:
    Al Ghamdi, N.
    Orendáčová, A.
    Pavlík, V.
    Orendáč, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368676.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Dg
    75.50.Ee
    75.30.Sg
    Opis:
    The magnetic susceptibility, specific heat and entropy of geometrically frustrated S=1/2 XY antiferromagnet $Er_{2}Sn_{2}O_{7}$ are reported. It is shown, that temperature dependence of magnetic susceptibility above nominally 10 K is governed by crystal field effects. Systematic study of specific heat in magnetic fields up to 7 T enabled the estimation of exchange coupling, J/k<<4.6 K. Investigation of isothermal change of magnetic entropy upon magnetization from 1 T to 7 T revealed the absence of enhanced magnetocaloric effect. The obtained results suggest that frustration parameter f ≈140 proposed for $Er_{2}Sn_{2}O_{7}$ earlier may be significantly overestimated.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 264-265
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bulk and Local Magnetic Susceptibility of $ErB_{12}$
    Autorzy:
    Bogach, A.
    Bogomolov, L.
    Glushkov, V.
    Demishev, S.
    Sluchanko, D.
    Sluchanko, N.
    Shitsevalova, N.
    Levchenko, A.
    Filipov, V.
    Flachbart, K.
    Siemensmeyer, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813645.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Eb
    75.50.Ee
    Opis:
    High precision measurements of magnetoresistance Δρ/ρ = f(T,H) and magnetization M(T,H) were carried out on single crystals of rare-earth dodecaboride $ErB_{12}$ at temperatures in the interval 1.8-30 K in magnetic fields up to 70 kOe. The high accuracy of the experiments allowed us to perform numerical differentiation and analyze quantitatively the behavior of the derivative d(Δρ/ρ)/dH = f(T,H) and of the magnetic susceptibility χ(T,H) = dM/dH in paramagnetic and magnetically ordered (antiferromagnetic, $T_N$ ≈ 6.7 K and $T_M$ ≈ 5.85 K) phases of $ErB_{12}$. It was shown that negative magnetoresistance anomalies observed in present study in paramagnetic state of $ErB_{12}$ may be consistently interpreted in the framework of a simple relation between resistivity and magnetization -Δρ/ρ ~ $M^2$.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 271-274
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Structure of RCuIn (R = Nd, Tb, Ho, Er)
    Autorzy:
    Szytuła, A.
    Baran, S.
    Jaworska-Gołąb, T.
    Penc, B.
    Zarzycki, A.
    Stűsser, N.
    Arulraj, A.
    Tyvanchuk, Yu.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813175.pdf
    Data publikacji:
    2008-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.12.-q
    71.20.Lp
    75.25.+z
    75.50.Ee
    Opis:
    Magnetic and neutron diffraction measurements of RCuIn (R = Nd, Tb, Ho, Er) are reported. The compounds crystallize in the hexagonal ZrNiAl-type structure. The ZrNiAl lattice originates from a distortion of a kagomélattice. The studied compounds are antiferromagnets with the Néel temperature equal to 4.9 K for R = Nd, 14.5 K for R = Tb, 4.5 K for R = Ho and 3.5 K for R = Er. The magnetic ordering is described by the propagation vectorwe k = (1/2, 1/2, $k_z$) with $k_z$ equal to 0.161(6) for R = Nd, 0.2213(5) for R = Tb, 0.2510(3) for R = Ho and 0 for R = Er. The magnetic structure is noncollinear with magnetic moments in the basal plane for R = Nd, Tb and Ho and collinear with magnetic moments parallel to the c-axis for R = Er. The observed magnetic ordering results from the competition between exchange interactions of the Ruderman-Kittel-Kasuya-Yosida type, the geometrical frustration of the rare-earth magnetic moments and the influence of the crystal electric field. The latter affects the direction of magnetic moments and is responsible for the magnetic crystalline anisotropy.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 4; 1185-1192
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phonon Drag and Magnetic Anomalies of Thermopower in $RB_{12}$ (R = Ho, Er, Tm, Lu)
    Autorzy:
    Glushkov, V.
    Demishev, S.
    Ignatov, M.
    Khayrullin, E.
    Sluchanko, N.
    Shitsevalov, N.
    Levchenko, A.
    Filipov, V.
    Flachbart, K.
    Siemensmeyer, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813647.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Jf
    75.50.Ee
    Opis:
    High precision measurements of the Seebeck coefficient S(T) were carried out on the single crystals of $RB_{12}$ (R = Ho, Er, Tm, Lu) at temperatures 2-300 K. It was shown that the effects of phonon drag result from vibrations of rare earth ions ($ħω_E$≈10-33 meV) in the rigid framework structure of the $B_{12}$ clusters and determine the main contribution to thermopower at intermediate temperatures (30-300 K). The correlated behavior of transport parameters favors the appreciable enhancement of spin fluctuations in the sequence of magnetic compounds $(HoB_{12}-TmB_{12})$ when approaching to the valence instability state in $YbB_{12}$. The giant increase in S(T) detected in the vicinity of the Néel temperature $T_N$ for $HoB_{12},$ $ErB_{12},$ and $TmB_{12}$ seems to result from the density of states renormalization caused by antiferromagnetic ordering.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 275-278
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoresistance Anisotropy and Magnetic H-T Phase Diagram of $Tm_{0.996}Yb_{0.004}B_{12}$
    Autorzy:
    Sluchanko, N.
    Azarevich, A.
    Bogach, A.
    Glushkov, V.
    Demishev, S.
    Gavrilkin, S.
    Gabani, S.
    Flachbart, K.
    Shitsevalova, N.
    Filipov, V.
    Vanacken, J.
    Moshchalkov, V.
    Stankiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1371466.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.15.Gd
    73.43.Qt
    75.30.Kz
    75.20.Hr
    75.50.Ee
    Opis:
    The antiferromagnetic ground state has been studied by transverse magnetoresistance, heat capacity and magnetization measurements, which were carried out on high quality single crystals of $Tm_{0.996}Yb_{0.004}B_{12}$ dodecaboride in strong magnetic fields at liquid helium temperatures. Both antiferromagnetic-paramagnetic (AF-P) and spin-orientation (AF1-AF2) phase transitions have been observed, and allowed to construct a complicated magnetic H-T phase diagram for this compound. Strong magnetoresistance anisotropy was found both in AF states (ρ(H||[110])/ρ(H||[111])~ 1.2 at H~ 20 kOe) and at the critical field of AF-P transition $(H_{N}[100]$/$H_{N}[111]$~ 1.25) in this magnetic metal with a simple fcc crystal structure.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 332-333
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Study of Phases in FeVO₄-Co₃V₂O₈ System
    Autorzy:
    Guskos, N.
    Zolnierkiewicz, G.
    Pilarska, M.
    Typek, J.
    Blonska-Tabero, A.
    Aidinis, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030217.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Cx
    75.50.Ee
    76.30.Fc
    Opis:
    Magnetic properties of four nFeVO₄/(1-n)Co₃V₂O₈ samples obtained in reactions between FeVO₄ and Co₃V₂O₈ (n = 0.96, 0.86, 0.84 and 0.83, samples designated S1, S3, S4, S5, respectively) have been investigated by DC magnetisation in field cooling and zero-field-cooling modes and EPR. DC magnetic susceptibility showed paramagnetic behavior of all samples in high-temperature range (T > 20 K) and transition to antiferromagnetic state at 16-18 K (depending on sample iron content). Additional magnetic freezing at 8 K was registered for S3-S5 samples containing larger amount of cobalt. The Curie-Weiss law in 100-300 K temperature range indicates that Co²⁺ is in the high-spin state (S = 3/2). From the parameters of the hysteresis loop observed for the samples it was calculated that 0.58% of all magnetic (Fe³⁺, Co²⁺) ions were involved in the ferromagnetic states. EPR spectra of the samples were recorded in high temperature range (T > 90 K). The temperature dependence of the spectral parameters (resonance field, linewidth, integrated intensity) suggested the Fe³⁺ high-spin ions coupled by antiferromagnetic interaction and clusters of ions play major role in EPR spectra.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 24-30
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of the $Bi_{0.65}La_{0.35}Fe_{0.5}Sc_{0.5}O_3$ Perovskite
    Autorzy:
    Fedorchenko, A.
    Fertman, E.
    Desnenko, V.
    Kotlyar, O.
    Čižmár, E.
    Shvartsman, V.
    Lupascu, D.
    Salamon, S.
    Wende, H.
    Salak, A.
    Khalyavin, D.
    Olekhnovich, N.
    Pushkarev, A.
    Radyush, Yu.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398308.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.85.+t
    75.60.Ej
    75.60.-d
    75.50.Ee
    Opis:
    Magnetic properties of polycrystalline multiferroic $Bi_{0.65}La_{0.35}Fe_{0.5}Sc_{0.5}O_3$ synthesized under high-pressure (6 GPa) and high-temperature (1500 K) conditions were studied using a SQUID magnetometer technique. The temperature dependent static magnetic moment M was measured in both zero-field-cooled and field-cooled modes over the temperature range of 5-300 K in low magnetic field H=0.02 kOe. The field dependent magnetization M(H) was measured in magnetic fields up to 50 kOe at different temperatures up to 230 K after zero-field cooling procedure. A long-range magnetic ordering of the antiferromagnetic type with a weak ferromagnetic contribution takes place below $T_{N} ≈ 220 K$. Magnetic hysteresis loops taken below $T_{N}$ show a huge coercive field up to $H_{c}$ ≈10 kOe, while the magnetic moment does not saturate up to 50 kOe. A strong effect of magnetic field on the magnetic properties of the compound has been found. Below $T_{N}$ ≈220 K the derivatives of the initial magnetization curves demonstrate the existence of a temperature-dependent anomaly in fields of H=15÷25 kOe. The nature of the anomaly is unknown and requires additional study.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1069-1071
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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