Autor: Nenkov, K. A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Magnetic Properties of DyTe
Autorzy:: Pokrzywnicki, S.
Duczmal, M.
Pawlak, L.
Nenkov, K. A.
Powiązania:: https://bibliotekanauki.pl/articles/1964659.pdf
Data publikacji:: 1997-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Ee
75.30.Cr
Opis:: Dysprosium monotelluride is a metallic substance with one valence electron per formula unit belonging to the conduction band. It crystallizes in the defected NaCl-type structure (a= 0.6070 nm) with cation deficiency in the metal sublattice. AC and DC susceptibilities exhibit a maximum at 15 K and a second maximum at higher temperatures which position is field dependent.
Źródło:: Acta Physica Polonica A; 1997, 92, 2; 351-354
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Composition and Temperature Dependence of Giant Magnetoresistance in Melt-Spun Co_{x}Cu_{100-x} Ribbons
Autorzy:: Idzikowski, B.
Nenkov, K.
Handstein, A.
Hütten, A.
Müller, K. H.
Powiązania:: https://bibliotekanauki.pl/articles/1964599.pdf
Data publikacji:: 1997-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Pa
72.15.Eb
81.40.Rs
Opis:: Structure, magnetic properties and magnetoresistance in as-quenched and annealed Co$\text{}_{x}$Cu$\text{}_{100-x}$ samples were investigated. Homogeneous metastable Co$\text{}_{x}$Cu$\text{}_{100-x}$ alloys were prepared by the single-roller technique. The maximum value of magnetoresistance is shifted to higher annealing temperatures with increasing measuring temperature. At higher measuring temperatures the magnetoresistance is not saturated in fields as high as 16 T. Susceptibility measurements showed the formation of hcp-structured Co clusters. For small cobalt concentrations there is a transition from giant magnetoresistance to the normal anisotropic magnetoresistance.
Źródło:: Acta Physica Polonica A; 1997, 92, 2; 307-310
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Giant Magnetoresistance in Melt-Spun Co-Cu Modified by Rare Earths
Autorzy:: Idzikowski, B.
Rössler, U. K.
Handstein, A.
Nenkov, K.
Müller, K.-H.
Powiązania:: https://bibliotekanauki.pl/articles/2013425.pdf
Data publikacji:: 2000-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Pa
75.50.Tt
Opis:: Samples of the composition RE$\text{}_{x}$Co$\text{}_{20}$Cu$\text{}_{80-x}$, RE = Sm, Gd or Dy (x = 0, 1, and 3) were produced by melt-spinning and subsequent annealing. The magnetoresistance is negative as in granular Co-Cu, but its values depend on the kind of rare earth element added and on changes in the microstructure induced by thermal annealing. An addition of 1 at.% rare earth metal to Co$\text{}_{20}$Cu$\text{}_{80}$ yields a considerable increase in the magnetoresistance ratio, whereas an addition of 3 at.% causes a decrease. E.g., by addition of 1 at.% Dy to Co$\text{}_{20}$Cu$\text{}_{80}$ and optimal thermal treatment, the value of magnetoresistance ratio measured at 10 K in a field of 5 T increases from -14% to -28%. The effect can be attributed to the presence of clusters of hexagonal Dy(Co,Cu)$\text{}_{5}$, which was ascertained from X-ray diffraction data, or other, metastable rare-earth compounds and paramagnetic rare-earth atoms in the Cu matrix.
Źródło:: Acta Physica Polonica A; 2000, 97, 5; 791-794
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Magnetic Properties of $RSn_{2}$ (R = Tb, Dy) Compounds
Autorzy:: Szytuła, A.
Kaczorowski, D.
Gondek, Ł.
Czub, J.
Nenkov, K.
Powiązania:: https://bibliotekanauki.pl/articles/1538313.pdf
Data publikacji:: 2010-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.40.-s
75.30.Kz
72.15.Eb
Opis:: Polycrystalline samples of $TbSn_{2}$ and $DySn_{2}$ were studied by means of magnetic susceptibility, electrical resistivity and heat capacity measurements. Both compounds have been found to order antiferromagnetically at low temperatures with some extra features in the ordered state due to changes in their magnetic structures. The two stannides exhibit metallic conductivity. The estimated crystal field levels splitting of $Tb^{3+}$ and $Dy^{3+}$ ground multiplets do not exceed 75 K.
Źródło:: Acta Physica Polonica A; 2010, 117, 4; 586-589
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Low-Field Magnetoresistance in Manganite Thin Films
Autorzy:: Vlakhov, E. S.
Dörr, K.-H
Müller, K.
Handstein, A.
Nenkov, K.
Walter, T.
Chakalov, R. A.
Chakalova, R. I.
Spasov, A. Y.
Powiązania:: https://bibliotekanauki.pl/articles/2013419.pdf
Data publikacji:: 2000-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Ak
73.50.Dn
Opis:: Grain boundaries play an important role in low-field magnetoresistance of La$\text{}_{0.7}$Ca$\text{}_{0.3}$MnO$\text{}_{3}$ and La$\text{}_{0.7}$Sr$\text{}_{0.3}$MnO$\text{}_{3}$ thin films deposited by magnetron sputtering and pulsed laser deposition on YSZ(100) and silicon substrates buffered by YSZ. Well-pronounced low-field magnetoresistance hysteresis was observed in magnetic fields applied in in-plane and out-of-plane directions. High values of local magnetoresistance sensitivity d(MR)/dH in the vicinity of the coercive field were obtained reaching up to 0.2%/Oe for La$\text{}_{0.7}$Ca$\text{}_{0.3}$MnO$\text{}_{3}$ samples at 5 K.zapis
Źródło:: Acta Physica Polonica A; 2000, 97, 5; 787-790
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 6.

Tytuł:: Structural, Magnetic and Transport Properties οf $NdBaCo_{2}O_{5+x}$ Thin Films Deposited by Magnetron Sputtering
Autorzy:: Vlakhov, E.
Szymczak, R.
Baran, M.
Piotrowski, K.
Szewczyk, A.
Paszkowicz, W.
Lobanovskii, L.
Matyajasik, S.
Nenkov, K.
Szymczak, H.
Powiązania:: https://bibliotekanauki.pl/articles/1810303.pdf
Data publikacji:: 2009-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.70.Ak
64.75.St
64.75.Lm
Opis:: For the first time, thin films of $NdBaCo_{2}O_{5+x}$ were deposited by RF magnetron sputtering on different substrates. The films deposited on $SrLaAlO_4(001)$ substrates exhibited highly textured structure with c-axis directed out-of-plane. Magnetic measurements M vs. T of three $NdBaCo_{2}O_{5+x}$/$SrLaAlO_4(001)$ films revealed successively paramagnetic-ferromagnetic-antiferromagnetic transitions with decrease in temperature. Their paramagnetic Curie-Weiss temperatures were estimated to be in the range of $T_{C}$ =100-116 K. Resistivity of the cobaltite thin film exhibited insulating behavior and the best fit was found for the variable range hopping mechanism.
Źródło:: Acta Physica Polonica A; 2009, 115, 1; 89-91
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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