Temat: 75.90.+w - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Anisotropy of Magnetoresistance and Shubnikov-de Haas Oscillations in Organic Metal (ET)$\text{}_{3}$CuCl$\text{}_{4}$ • H$\text{}_{2}$O
Autorzy:: Pesotskii, S.
Kovalev, A. E.
Lyubovskii, R. B.
Kushch, N. D.
Tematy:: 75.90.+w; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1933340.pdf Link otwiera się w nowym oknie
Opis:: Behavior of the magnetoresistance has been studied in organic quasi two-dimensional metal (ET)$\text{}_{3}$CuCl$\text{}_{4}$•H$\text{}_{2}$O. Shubnikov-de Haas oscillations have been observed at the magnetic field directions near H ∥ c*. The oscillations frequency at H ∥ c* equals 45 T that corresponds approximately to 1% of the first Brillouin zone cross-section. The angle dependence of the oscillations frequency allows one to imagine at least the part of Fermi surface in the form of cylinder with an axis along c*.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Magnetic separation of graphite and magnesia
Autorzy:: Uyeda, C.
Hisatoshi, K.
Tematy:: 75.90.+w; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1048225.pdf Link otwiera się w nowym oknie
Opis:: An ensemble of graphite and magnesia particles was successfully separated into different groups of materials by translating them in an area of magnetic field produced by a NdFeB magnetic-circuit. The absolute value of diamagnetic susceptibility |χ_{dia}| was 2.6×10¯⁷ emu/g in magnesia; previously the separation of diamagnetic grains was possible in materials with |χ_{dia}| values above 5×10¯⁷ emu/g. Terminal velocity observed in a area outside the magnetic field in the magnesia particles having different mass between 0.12 to 0.35 mg, converged to a constant value 1.27±0.05 cm/s; the value was consistent with a theoretical value based on a simple conversion rule between magnetic potential and kinetic energy assumed in the particles. Similar result was obtained for the graphite particles. The technical improvements introduced in the present study to translate the MgO particles can be applied to realize magnetic separation of diamagnetic materials in general.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Structure and Magnetic Properties of Amorphous $Fe_{60}Co_{10}Mo_{2}W_{x}Y_8 B_{20-x}$ (x=0, 1) Alloys
Autorzy:: Błoch, K.
Nabiałek, M.
Garus, S.
Tematy:: 75.47.Np
75.50.Bb
75.50.Kj
75.90.+w; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1398365.pdf Link otwiera się w nowym oknie
Opis:: This paper presents studies of the bulk amorphous alloys: $Fe_{60} Co_{10} Mo_2 Y_{8} B_{20}$ and $Fe_{60} Co_{10} Mo_2 W_1 Y_8 B_{19}$; Both compounds were obtained by means of the injection-casting method in which liquid alloy is forced under pressure into a copper mould. The structure of the samples was studied using X-ray diffraction and scanning electron microscopy. Based on the results of the X-ray diffraction studies, it was found that the samples were in the amorphous state. Scanning electron microscopy image analysis of fractured alloy samples indicated the presence of areas of varying degrees of relaxation: "smooth", "vein", and "flake" fractures. The manufactured ferromagnetic samples were characterized by so-called soft magnetic properties with a relatively high Curie temperature of more than 520 K. In the investigated samples, the saturation magnetization was found to have been decreased from 1.14 T to 1.13 T after the addition of W. Tungsten also contributed significantly to an increase in the value of the coercive field, from 27 A/m to 8685 A/m. Following the addition of just 1% of W to the alloy, a substantial change was observed in the form: of the static magnetic hysteresis loop: characterized by the so-called "wasp" shape. This result shows that an additional magnetically hard phase had appeared within the sample.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Structure and magnetic properties of amorphous Fe₈₂Zr₇Nb₂Cu₁B₈ and crystalline Fe₈₂Zr₆Y₁Nb₂Cu₁B₈ alloys
Autorzy:: Gondro, J.
Błoch, K.
Nabiałek, M.
Tematy:: 75.47.Np
75.50.Bb
75.50.Kj
75.90.+w; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1153084.pdf Link otwiera się w nowym oknie
Opis:: In order to obtain an alloy with a specific set of magnetic properties, the dominant influences of chemical component and thermal treatment selection need to be satisfied. In this paper, the results of investigations into the microstructure and magnetic properties of the following alloys are presented: amorphous Fe₈₂Zr₇Nb₂Cu₁B₈ and crystalline Fe₈₂Zr₆Y₁Nb₂Cu₁B₈. The structure and microstructure were examined using the Mössbauer spectroscopy and X-ray diffractometry. The Fe₈₂Zr₇Nb₂Cu₁B₈alloy was found to be fully amorphous in the as-quenched state and the transmission Mössbauer spectrum for this alloy is typical of that for weak ferromagnets, with an average hyperfine field of 9.86(2) T. The shape of this spectrum was found to have changed noticeably in the case of the Fe₈₂Zr₆Y₁Nb₂Cu₁B₈ alloy. This change was attributed to the presence of the crystalline phase bcc-Fe.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Magnetic Properties of Spin-Ladders (A$\text{}_{2}$Cu$\text{}_{2}$O$\text{}_{3}$)$\text{}_{m}$ (CuO$\text{}_{2}$)$\text{}_{n}$
Autorzy:: Baran, M.
Szymczak, H.
Szymczak, R.
Dyeyev, S.
Leonyuk, L.
Babonas, G.-J.
Tematy:: 75.40.Cx
75.30.Gw
75.45.+j
75.90.+w; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2013220.pdf Link otwiera się w nowym oknie
Opis:: Magnetization M(T) and M(H) data of single crystals of the S=1/2 quasi-one-dimensional system (A$\text{}_{2}$Cu$\text{}_{2}$O$\text{}_{3}$)$\text{}_{m}$(CuO$\text{}_{2}$)$\text{}_{n}$ with various A-site constituents are compared. The studied orthorhombic, incommensurate crystals are characterized by m/n=5/7,7/10, and 9/13. The role of rare-earth ions located in A-sites is discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Magnetocaloric Effect in Amorphous and Partially Crystallized Fe-Zr-Nb-Cu-B Alloy
Autorzy:: Gondro, J.
Błoch, K.
Nabiałek, M.
Wallters, S.
Tematy:: 75.30.Sg
75.47.Np
75.50.Bb
75.50.Kj
75.90.+w
87.64.Pj; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1387568.pdf Link otwiera się w nowym oknie
Opis:: This paper presents the results of an investigation into the: microstructure, magnetic properties and influence of annealing temperature on the magnetocaloric effect of Fe₈₂Zr₇Nb₂Cu₁B₈ alloy in the as-quenched and partially crystalline state. The microstructure was investigated using Mössbauer spectroscopy. The magnetocaloric effect was observed as a change in the magnetic entropy, which was calculated from isothermal magnetization curves. Fully-amorphous Fe₈₂Zr₇Nb₂Cu₁B₈ alloys, in the as-quenched state, exhibit a Curie temperature equal to (340±5) K. The transmission Mössbauer spectrum for the as-quenched Fe₈₂Zr₇Nb₂Cu₁B₈ alloy is typical for weak ferromagnets with the average hyperfine field of 9.86(2) T. For this alloy in the as-quenched state, the changes in maximum magnetic entropy occur near the Curie points and are equal to 0.95 J/(kg K). Also, the maximum magnetic entropy changes decrease after partial crystallization.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: The Influence of Jahn-Teller Effect on Magnetic Properties of Fe-Based Semimagnetic Semiconductors
Autorzy:: Lebeckl, K.
Twardowski, A.
Liro, Z.
Tematy:: 75.90.+w
71.70.Ej
71.70.Ch
75.50.Pρ; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1887005.pdf Link otwiera się w nowym oknie
Opis:: We report results of calculations of magnetic properties (specific heat, magnetization) of Fe-based Semimagnetic Semiconductors including Jahn-Teller coupling between Fe electronic states and phonons.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Magnetic properties of Co-Fe-Si-B microwires
Autorzy:: Kwapuliński, P.
Gieraltowski, J.
Dolabdjian, C.
Stokłosa, Z.
Haneczok, G.
Tematy:: 72.15.Gd
75.30.Gw
75.50.Gg
75.50.Kj
75.90.+w; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1055108.pdf Link otwiera się w nowym oknie
Opis:: In the paper the magneto-impedance effect in the Co_{68.15}Fe_{4.35}Si_{12.55}B_{15} microwire with diameter of about 100 μ m is carefully studied. The measurements in close contact and contactless geometry were carried out in the static field ranging from 0 to 6 kA/m and frequencies of the alternating field from 20 Hz to 2 MHz. It is shown that the examined microwire shows high anisotropy of soft magnetic properties i.e. the circumferential permeability is at least 7 times higher than the longitudinal one. Moreover, the microwire can be used as highly sensitive magneto-impedance sensor working in contactless geometry especially at fields below 200 A/m.
Dostawca treści:: Biblioteka Nauki

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