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Wyszukujesz frazę "75.30.Kz" wg kryterium: Temat


Tytuł:
Weak Ferromagnetism in the Helimagnet $Ba_{2}CuGe_{2}O_{7}$
Autorzy:
Chovan, J.
Marder, M.
Papanicolaou, N.
Powiązania:
https://bibliotekanauki.pl/articles/1366485.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Ds
75.30.Gw
75.30.Kz
Opis:
The Dzyaloshinskii-Moriya anisotropy, responsible for helimagnetism in $Ba_{2}CuGe_{2}O_{7}$, has recently been shown to comprise also a weak-ferromagnetic component. We theoretically demonstrate the signatures of weak-ferromagnetism in the magnon spectrum when a magnetic field is applied perpendicular to the z axis. We also anticipate the occurrence of unconventional domain walls in the so-called intermediate phase, and briefly elucidate the importance of the weak ferromagnetic component of the Dzyaloshinskii-Moriya anisotropy for the dynamics of driven domain walls.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 32-33
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport Properties of $CeCo_{12}B_6$ in Vicinity of Phase Transition
Autorzy:
Skorokhod, Y.
Arnold, Z.
Míšek, M.
Kamarád, J.
Isnard, O.
Mayot, H.
Powiązania:
https://bibliotekanauki.pl/articles/1813635.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Kz
75.40.-s
72.15.Eb
Opis:
Study of resistivity and specific heat on $CeCo_{12}B_6$ compound was performed in a temperature range 2.5-300 K. The specific heat exhibits pronounced λ-type anomaly in the vicinity of the Curie temperature $T_C$. Using the Debye-Einstein model the following parameters were obtained: the Debye temperature $θ_D$ = 185 K, coefficient of the electron specific heat $γ_{el}$ = 115 mJ/mol K. The parabolic temperature dependence of resistivity ρ(T) = $ρ_0 + A_ρT^2$ was observed below $T_C$ in agreement with ferromagnetic state. Comparison of dρ/dT(T) with $C_M(T)$ allows to confirm their similar character, accordingly to theory of critical behavior.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 259-262
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical Study of Phase Diagrams for Reentrant Superconducting Er$\text{}_{1-x}$Ho$\text{}_{x}$X, Er$\text{}_{1-x}$Gd$\text{}_{x}$X, Er$\text{}_{1-x}$Tm$\text{}_{x}$X, Ho$\text{}_{x}$Lu$\text{}_{1-x}$X, and Sm$\text{}_{1-x}$Er$\text{}_{x}$X (X = Rh$\text{}_{4}$B$\text{}_{4}$) Alloys
Autorzy:
Gosławska, E.
Matlak, M.
Powiązania:
https://bibliotekanauki.pl/articles/2013024.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Kz
75.40.Cx
Opis:
We consider a simplified version of the s-f model, supplemented by the intersite Cooper pairs interaction between conduction electrons with opposite spins to investigate ferromagnetic and superconducting properties of an alloy Re$\text{}_{1-x}^{(1)}$Re$\text{}_{x}^{(2)}$X (Re$\text{}^{(1),(2)}$ - rare earth elements, X = Rh$\text{}_{4}$B$\text{}_{4}$) using the virtual crystal approximation. For a suitable choice of the model parameters we can reproduce the phase boundaries of the experimentally measured phase diagrams for Er$\text{}_{1-x}$Ho$\text{}_{x}$X, Er$\text{}_{1-x}$Gd$\text{}_{x}$ X, Er$\text{}_{1-x}$Tm$\text{}_{x}$X, Ho$\text{}_{x}$Lu$\text{}_{1-x}$X, and Sm$\text{}_{1-x}$Er$\text{}_{x}$X alloys.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 415-418
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical Investigation of the Complete Phase Diagram of the SmMn$\text{}_{2}$Ge$\text{}_{2}$ Metamagnet
Autorzy:
Polaszek, P.
Onyszkiewicz, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1929828.pdf
Data publikacji:
1993-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Kz
Opis:
A two-sublattice Ising model with spatial four-spin and six-spin anisotropy added in order to describe SmMn$\text{}_{2}$Ge$\text{}_{2}$ metamagnet is discussed. The complete phase diagrams for this metamagnet as a function of hydrostatic pressure are obtained.
Źródło:
Acta Physica Polonica A; 1993, 84, 6; 1101-1109
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Reorientation Temperature in an Antiferromagnetic Monolayer
Autorzy:
Ilkovič, V.
Kecer, J.
Powiązania:
https://bibliotekanauki.pl/articles/1534181.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Jm
75.30.Ds
75.30.Kz
75.70.Ak
Opis:
The reorientation temperature in an antiferromagnetic square lattice is studied within the framework of many-body Green function theory. The model Hamiltonian includes a Heisenberg term, second-order single-ion anisotropy, and a transverse external magnetic field in the x-direction. We investigate the orientation temperature as a function of the single-ion anisotropy parameter and for different transverse magnetic fields.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 854-855
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Magnetic Reorientation in Ferrimagnetic Systems
Autorzy:
Ilkovič, V.
Powiązania:
https://bibliotekanauki.pl/articles/1199530.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Jm
75.30.Ds
75.30.Kz
75.70.Ak
Opis:
The Green function theory is used to study the phenomenon of magnetic reorientation in the ferrimagnetic system. The two-sublattice ferrimagnetic system, with different spins and the intra-sublattice ferromagnetic exchange interactions, is considered. The magnon fluctuations supress in different way the magnetic orders of the sublattices and one obtains two magnetic orders. Each of these orders has different reorientation temperatures.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 34-35
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Investigation of the Magnetization Reversal Mechanism in the Nd-Fe-B Type Magnet, Aligned by Hot Deformation
Autorzy:
Dośpiał, M.
Nabiałek, M.
Szota, M.
Lipiec, W.
Nizhankovskii, V.
Ceglarek, A.
Pietrusiewicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/1429024.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.30.Kz
75.50.Vv
75.50.Ww
75.60.Jk
Opis:
The magnetization reversal mechanism in the $Nd_{16}Fe_{78}B_6$ hot densified magnet, aligned by means of die-upset forging has been investigated. The magnetic parameters have been derived from major hysteresis loop. The magnetocrystalline anisotropy constants $K_1$ and $K_2$ using Sucksmith-Thompson relation modified by Ram and Gaunt have been calculated from the high field measurements up to 5 T. These data have been used to determine the theoretical value of coercivity as a function of the angle $Ψ_0$ between the sample easy axis and the applied magnetic field direction. The experimental value of coercivity as a function of $Ψ_0$ has been determined from the demagnetization curves measured for different $Ψ_0$ angles. It was found that the best correlation between theoretical and experimental data have been achieved for magnetization reversal mechanism controlled partially by pinning of domain walls on grain boundaries and nucleation processes.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1282-1284
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effects of the Random Transverse Crystal Field on the Spin-1 Model
Autorzy:
Albayrak, E.
Powiązania:
https://bibliotekanauki.pl/articles/1399269.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.10.Hk
75.30.Kz
75.50.Gg
Opis:
The effects of random transverse crystal field are investigated in the mean-field approximation on the spin-1 model. The transverse crystal field is applied on a lattice in a bimodal random distribution with a tunable parameter adjusting the strength of one mode with respect to the other one. Then, the phase diagrams are calculated on the reduced temperature-transverse crystal field planes for given values of probability p and coordination number q at zero external magnetic field h. It was found that the model gives both second- and first-order phase transitions and tricritical points which is a well-known behavior of the spin-1 model. In addition, the model also yields critical end points and end points for the first-order phase transition lines for appropriate p values.
Źródło:
Acta Physica Polonica A; 2015, 127, 3; 818-822
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect on Highly Cr-Substituted Manganite Nd$\text{}_{0.6}$C a$\text{}_{0.4}$(Mn$\text{}_{0.5}$Cr$\text{}_{0.5}$)O$\text{}_{3}$
Autorzy:
Gamari-Seale, H.
Troyanchuk, I. O.
Bushinsky, M. V.
Stefanopoulos, K. L.
Hernandez-Velasco, J.
Powiązania:
https://bibliotekanauki.pl/articles/2037098.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.25.+z
75.30.Kz
75.47.Lx
Opis:
Neutron powder-diffraction experiments on the highly Cr-substituted manganite, Nd$\text{}_{0.6}$Ca$\text{}_{0.4}$(Mn$\text{}_{0.5}$Cr$\text{}_{0.5}$)O$\text{}_{3}$, at different temperatures and fields reveal that the structure retains the charge exchange-type of the parent compound, Nd$\text{}_{0.6}$Ca$\text{}_{0.4}$MnO$\text{}_{3}$. It is antiferromagnetic below 200 K and becomes a canted antiferromagnet below 50 K. The Mn and Cr form zig-zag ferromagnetic chains coupled antiferromagnetically in the ac-plane. These are stacked along the b-axis with opposite spins.
Źródło:
Acta Physica Polonica A; 2004, 105, 1-2; 81-86
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Ce Dilution on the Ferromagnetic Ordering in CeAuGe
Autorzy:
Sondezi, B.
Strydom, A.
Powiązania:
https://bibliotekanauki.pl/articles/1384842.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Cr
75.30.Kz
75.30.Mb
Opis:
Transport and thermodynamic properties of the well-ordered hexagonal CeAuGe compound have been studied. This compound is known to order ferromagnetically at $T_{C}$ = 10 K with well-defined anomalies in magnetic susceptibility χ(T), electrical resistivity ρ(T) and specific heat $C_p(T)$ characterising the phase transition. The location of $T_{C}$ has been observed to be unstable and enhanced even in moderate applied magnetic fields. However, the dilution of magnetic species, Ce, with the non-f electron element, La, is shown in this work to achieve a continuous suppression of $T_{C}$ to 0 K. The integrity of the space group and the details of the unit cell occupation are retained throughout the substitution series, as is the high-temperature localized Ce-effective magnetic moment $μ_{eff}$ = 2.54 $μ_{B}$/(mol Ce). Our studies of physical properties down to 0.05 K show a quantum critical form of non-Fermi liquid behaviour, characterised by a logarithmic divergence in $C_p(T)$/T data in the very dilute Ce content.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 228-230
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Distribution of Magnetization for a Stepped Ferro-Antiferromagnet Interface
Autorzy:
Dudko, O. K.
Kovalev, A. S.
Powiązania:
https://bibliotekanauki.pl/articles/2013075.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Kz
Opis:
Magnetization distribution of a disclination type connected with the atomic step on the ferro-antiferromagnet boundary is studied. The results are generalized for the periodic stepped interface.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 479-482
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Effects in Spin-Wave Spectrum of the Semi-Infinite FeBr$\text{}_{2}$ Field-Induced Metamagnet
Autorzy:
Rudziński, W.
Maciejewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1930606.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Ds
75.30.Kz
Opis:
Surface spin waves in the layered structure of the FeBr$\text{}_{2}$ field-induced metamagnet are studied theoretically. Surface spin-wave modes are calculated for the (001) surface and for the paramagnetic phase at low temperatures. Allowing the surface exchange parameters to deviate from the bulk values, full richness of the surface spin-wave spectra is displayed. The problem of the stability of the ground state of the system is also discussed.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 433-437
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Substitution effects on the magnetic properties of Fe-containing chalcogenides with NiAs-type structures
Autorzy:
Baranov, N.
Selezneva, N.
Sherokalova, E.
Gubkin, A.
Sherstobitov, A.
Shishkin, D.
Powiązania:
https://bibliotekanauki.pl/articles/1050741.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Kz
75.50.Vv
75.60.-d
Opis:
The changes in the magnetization processes caused by Se for S substitutions in the layered chalcogenide compounds Fe_{x}TiS_{2-y}Se_{y} (x=0.5, 0.66) with antiferromagnetic (AF) and ferrimagnetic (FI) orderings, respectively, have been studied by using the magnetization and magnetoresistance measurements. Unusually high values of the coercive fields (H_{c} up to 56 kOe) have been observed at low temperatures in Fe_{0.5}TiS_{2-y}Se_{y} with the Se content y<0.5, which is ascribed to the presence of an unquenched orbital moment on Fe ions and to the formation of a magnetically heterogeneous state in the vicinity of H_{c}. The Se for S substitution in Fe_{0.66}TiS_{2-y}Se_{y} leads to the transition from the FI to AF state and to non-monotonous change of H_{c} with a maximal value 22 kOe an y=0.5. The changes in the magnetic state of Fe_{x}TiS_{2-y}Se_{y} are suggested to be strongly affected by the distribution of Fe ions and vacancies in cationic layers.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 447-449
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Chemistry and Magnetic Properties of $R_2Ni_{2-x}In$ (R=Gd-Er, x=0.22 or 0.3) Compounds
Autorzy:
Tyvanchuk, Yu.
Baran, S.
Jaworska-Gołąb, T.
Duraj, R.
Kalychak, Ya.
Szytuła, A.
Powiązania:
https://bibliotekanauki.pl/articles/1489895.pdf
Data publikacji:
2012-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Cr
75.30.Kz
61.10.-i
61.66.Dk
75.40.Gb
75.50.Ee
Opis:
X-ray diffraction and magnetic measurements of $R_2Ni_{2 - x}In$ (R = Ho, Dy, x = 0.3 and R = Gd, Tb, Er, x = 0.22) compounds are reported. The compounds crystallize in the tetragonal $Mo_2FeB_2$-type crystal structure (space group P4/mbm). Magnetic measurements reveal antiferromagnetic order with the Néel temperatures $T_{N}$ equal to 26.4 K (Gd), 20.2 K (Tb), 8.3 K (Dy), 7.1 K (Ho), and 6.3 K (Er). For R = Gd, Tb and Er an additional phase transition below $T_{N}$ is observed at 13.5, 13.1, and 5.0 K, respectively.
Źródło:
Acta Physica Polonica A; 2012, 121, 3; 678-681
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Magnetic Studies of the Fe-Co-Zr-Mo-W-B Amorphous Alloy
Autorzy:
Kotynia, K.
Pawlik, P.
Hasiak, M.
Pruba, M.
Pawlik, K.
Powiązania:
https://bibliotekanauki.pl/articles/1030235.pdf
Data publikacji:
2017-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Dq
75.50.Kj
75.30.Sg
75.30.Kz
75.40.-s
Opis:
The paper presents a characterization of the phase structure by X-ray diffraction and isothermal magnetic entropy changes for the amorphous Fe₅₈Co₁₀Zr₁₀Mo₅W₂B₁₅ alloy sample in the as-quenched state. An ingot sample was obtained by arc-melting. The ribbon sample was obtained by the melt-spinning technique. The magnetic measurements at various temperatures allowed for the study of the Curie temperature T_{C} and magnetic entropy changes |ΔS_{M}|. In order to determine the Curie temperature T_{C} of amorphous phase, three independent methods were used. Determination of the Curie temperature T_{C} for the amorphous alloys is not a trivial problem, as magnetization does not decreases rapidly around T_{C}. Therefore it is essential issue to establish T_{C} using few complementary methods. X-ray diffraction analysis revealed a fully amorphous structure of the ribbon samples.
Źródło:
Acta Physica Polonica A; 2017, 131, 5; 1204-1206
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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