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    Wyświetlanie 1-8 z 8
    Tytuł:
    Phase Transitions Induced in HoCo$\text{}_{3}$Ni$\text{}_{2}$ Single Crystals
    Autorzy:
    Zawadzki, J.
    Ballou, R.
    Gorges, B.
    Szymczak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1928269.pdf
    Data publikacji:
    1993-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.30.Kz
    75.50.Gg
    75.60.Ej
    Opis:
    The magnetic studies of temperature and field induced phase transitions were performed on single crystals of HoCo$\text{}_{3}$Ni$\text{}_{2}$ compound. The rotational-type spin reorientation was found between T$\text{}_{SR1}$ = 160 K and T$\text{}_{SR2}$ = 200 K. In the vicinity of T$\text{}_{SR1}$ two different field induced transitions were observed: the first order moment reorientation type transition in the basal plane and the spin reorientation from the easy plane to the c-axis with simultaneous increase in spontaneous magnetization. The intersublattice molecular field coefficient as well as the magnetization anisotropy of Ho sublattice were determined. The observed magnetic behaviour was analysed within the framework of the spin-reorientation model, taking into account the change of the intrinsic states of rare-earth ions caused by their huge anisotropy energy. The thermal variation of the anisotropy constants of the studied compound is also presented.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 2; 209-218
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Phase Transitions in Intermetallic GdNi$\text{}_{5-x}$Sn$\text{}_{1+x}$ and TbNi$\text{}_{5-x}$Sn$\text{}_{1+x}$ Compounds
    Autorzy:
    Baran, M.
    Szymczak, H.
    Szymczak, R.
    Romaka, L.
    Skolozdra, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964576.pdf
    Data publikacji:
    1997-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.En
    75.30.Kz
    75.60.Ej
    75.30.Cr
    Opis:
    Magnetization measurements were performed for intermetallic compounds GdNi$\text{}_{5-x}$Sn$\text{}_{1+x}$ and TbNi$\text{}_{5-x}$Sn$\text{}_{1+x}$ in the temperature range from 4.5 K to 280 K and in magnetic field up to 50 kOe. Complex magnetic phase diagram was revealed for both compounds. The results are discussed assuming three-sublattice magnetic structure and partial disordering of the structure.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 2; 295-298
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Field-Induced Magnetic Order in Frustrated $TbBaCo_4O_7$ Single Crystals
    Autorzy:
    Szymczak, R.
    Bludov, A.
    Gnatchenko, S.
    Barilo, S.
    Jezierski, A.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1536830.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Cr
    75.30.Gw
    75.30.Kz
    75.60.Ej
    75.50.Dd
    Opis:
    We present results of dc magnetic susceptibility measurements in $TbBaCo_4O_7$ single crystals performed at temperatures in the range 2-300 K and in magnetic fields up to 55 kOe. The results obtained seem to suggest that the ground state of $TbBaCo_4O_7$ is composed of coexisting long-range ordered and short-range ordered clusters and is transformed into a magnetically ordered weak ferromagnetic phase by application high magnetic field along c-axis.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 299-302
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the Canting of Local Anisotropy Axes on Ground-State Properties of a Ferrimagnetic Chain with Regularly Alternating Ising and Heisenberg Spins
    Autorzy:
    Torrico, J.
    Lyra, M.
    Rojas, O.
    de Souza, S.
    Strečka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032717.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Pq
    75.10.Kt
    75.30.Kz
    75.40.Cx
    75.60.Ej
    Opis:
    The effect of the canting of local anisotropy axes on the ground-state phase diagram and magnetization of a ferrimagnetic chain with regularly alternating Ising and Heisenberg spins is exactly examined in an arbitrarily oriented magnetic field. It is shown that individual contributions of the Ising and Heisenberg spins to the total magnetization basically depend on the spatial orientation of the magnetic field and the canting angle between two different local anisotropy axes of the Ising spins.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 621-623
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of the Rapidly Solidified Bulk Alloy: $Fe_{61}Co_{10}B_{20}Y_{8-x}W_{y}Pt_{x}$ (where: x=1,2; y=0,1)
    Autorzy:
    Pietrusiewicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1397021.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.43.Dq
    75.50.Gg
    75.50.Tt
    75.30.Kz
    75.60.Ej
    Opis:
    In the literature, research into rapidly cooled Pt-based alloys usually features samples that are produced in the form of thin ribbons. This work presents the effect of the addition of a small quantity of W and Pt on the magnetic properties of massive two-phase alloys, the samples being produced in the form of plates with a thickness of 0.5 mm. Both amorphous and crystalline phases were observed in the alloys, the phase proportions depending on the composition of the alloy. Generally, it is assumed that alloys with added Pt are characterised by a relatively high saturation magnetization and magnetocrystalline anisotropy, which is mainly influenced by the presence of the crystalline phases: FePt and Fe₃Pt. For the investigated alloys, it was noted that the gradual substitution of W and Pt in place of Y within the alloy $Fe₆₁Co₁₀B₂₀Y_{8-x}W_{y}Pt_{x}$ increased the value of saturation magnetization $(μ₀M_{s})$ and reduced the coercive field $(H_{c})$. On the basis of XRD pattern analysis it was found that, within the sample with the highest concentration of Pt, there are crystallites of the smallest size and the proportion of the α-Fe crystalline phase is much greater than for the other studied samples.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 666-668
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Breakdown of a Magnetization Plateau in Ferrimagnetic Mixed Spin-(1/2,S) Heisenberg Chains due to a Quantum Phase Transition towards the Luttinger Spin Liquid
    Autorzy:
    Strečka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032725.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Pq
    75.10.Kt
    75.30.Kz
    75.40.Cx
    75.60.Ej
    Opis:
    Magnetization curves of the ferrimagnetic mixed spin-(1/2,S) Heisenberg chains are calculated with the help of density-matrix renormalization group method for several quantum spin numbers S=1, 3/2, 2 and 5/2. It is shown that the ferrimagnetic mixed spin-(1/2,S) Heisenberg chains exhibit irrespective of the spin value S exactly one intermediate magnetization plateau, which can be identified with the gapped Lieb-Mattis ferrimagnetic ground state. The magnetization plateau due to the Lieb-Mattis ferrimagnetism breaks down at a quantum phase transition towards the Luttinger spin liquid, which is characterized by a continuous change of the magnetization with the magnetic field until another quantum critical point is reached at the saturation field.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 624-626
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Ion-Irradiation upon Microstructure and Magnetic Properties of NANOPERM-Type Fe₈₁Mo₈Cu₁B₁₀ Metallic Glass
    Autorzy:
    Hasiak, M.
    Miglierini, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030756.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    75.60.Ej
    75.30.Kz
    61.80.-x
    76.80.+y
    Opis:
    Microstructure and soft magnetic properties of the Fe₈₁Mo₈Cu₁B₁₀ amorphous alloy in the as-quenched state and after irradiation with N⁺ ions are investigated. CEMS spectra show that the irradiated surface at the air side of the ribbons was significantly affected. On the other hand, no noticeable changes were observed at the opposite wheel side. More deep subsurface regions are also not altered as evidenced by CXMS spectra. Thermomagnetic measurements have shown presence of two magnetically different phases with well distinguished Curie points. They can be ascribed to the amorphous matrix and crystalline phases. The latter were quenched-in during the production process and/or induced by ion bombardment. Curie temperatures of the amorphous matrixes were calculated using the Heisenberg model. For the as-quenched and irradiated ribbons they are of 223 K and 228 K, respectively. The behaviour of coercivity versus temperature was also analysed.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 680-683
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic and Mössbauer Study of Cerium-Based Reactive Sorbent
    Autorzy:
    Jiraskova, Y.
    Bursik, J.
    Zivotsky, O.
    Lunacek, J.
    Janos, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032876.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Tt
    75.60.Ej
    76.80.+y
    61.46.Df
    75.30.Kz
    75.50.Bb
    Opis:
    A new kind of magnetically separable composite consisting initially of magnetite and cerium carbonate nanograins was investigated using magnetic and Mössbauer methods at room and low temperatures. Various stages of calcination treatment in air resulted in a transformation of the cerium carbonate into cerium dioxide and magnetite into more complicated iron oxide compositions. The final CeO₂ nanograins on the surface of α-Fe₂O₃ were obtained after calcination at 973 K.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1096-1098
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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