Autor: Müller, K.-H. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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: 2.

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: 3.

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: 4.

Tytuł:: Charge Carrier Dynamics in $Ga_{1-x}Mn_{x}As$ Studied by Resistance Noise Spectroscopy
Autorzy:: Lonsky, M.
Teschabai-Oglu, J.
Pierz, K.
Sievers, S.
Schumacher, H.
Yuan, Y.
Böttger, R.
Zhou, S.
Müller, J.
Powiązania:: https://bibliotekanauki.pl/articles/1397018.pdf
Data publikacji:: 2018-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Pp
73.50.Td
73.50.-h
73.61.-r
64.60.ah
61.72.-y
Opis:: We report on electronic transport measurements of the magnetic semiconductor Ga_{1-x}Mn_{x}As, whereby the defect landscape in various metallic thin films (x=6%) was tuned by He-ion irradiation. Changes in the distribution of activation energies, which strongly determine the low-frequency 1/f-type resistance noise characteristics, were observed after irradiation and can be explained by deep-level traps residing in the As sublattice. Various other kinds of crystalline defects such as, for instance, Mn interstitials, which possibly form nanoscale magnetic clusters with a fluctuating spin orientation, also contribute to the 1/f noise and can give rise to random telegraph signals, which were observed in films with x=7%. In addition, we neither find evidence for a magnetic polaron percolation nor any features in the noise near the Curie temperature.
Źródło:: Acta Physica Polonica A; 2018, 133, 3; 520-522
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Informacja