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Composition and Temperature Dependence of Giant Magnetoresistance in Melt-Spun Co_{x}Cu_{100-x} Ribbons

100%

Idzikowski B., Nenkov K., Handstein A., Hütten A., Müller K.-H.

Acta Physica Polonica A

1997

vol. 92

issue 2

307-310

Structure, magnetic properties and magnetoresistance in as-quenched and annealed Co_{x}Cu_{100-x} samples were investigated. Homogeneous metastable Co_{x}Cu_{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.

Giant Magnetoresistance in Melt-Spun Co-Cu Modified by Rare Earths

100%

Idzikowski B., Rössler U., Handstein A., Nenkov K., Müller K.

Acta Physica Polonica A

2000

vol. 97

issue 5

791-794

Samples of the composition RE_{x}Co_{20}Cu_{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_{20}Cu_{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_{20}Cu_{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)_{5}, which was ascertained from X-ray diffraction data, or other, metastable rare-earth compounds and paramagnetic rare-earth atoms in the Cu matrix.

Low-Field Magnetoresistance in Manganite Thin Films

73%

Vlakhov E., Dörr K., Müller K., Handstein A., Nenkov K., Walter T., Chakalov R., Chakalova R., Spasov A.

Acta Physica Polonica A

2000

vol. 97

issue 5

787-790

Grain boundaries play an important role in low-field magnetoresistance of La_{0.7}Ca_{0.3}MnO_{3} and La_{0.7}Sr_{0.3}MnO_{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_{0.7}Ca_{0.3}MnO_{3} samples at 5 K.

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3 Acta Physica Polonica A

2 2000

1 1997

3 Handstein A.

3 Nenkov K.

2 Idzikowski B.

2 Müller K.

1 Chakalov R.

1 Chakalova R.

1 Dörr K.

1 Hütten A.

1 Müller K.-H.

1 Rössler U.

1 Spasov A.

1 Vlakhov E.

1 Walter T.

Search results

Composition and Temperature Dependence of Giant Magnetoresistance in Melt-Spun Co_{x}Cu_{100-x} Ribbons

Giant Magnetoresistance in Melt-Spun Co-Cu Modified by Rare Earths

Low-Field Magnetoresistance in Manganite Thin Films