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La_{0.7}Sr_{0.3}MnO_3 Thin-Film Grain-Boundary Junctions on a Bi-Crystal Substrate

100%

Gierłowski P., Szewczyk A., Abal'oshev A., Vlakhov E., Donchev T., Blagoev B.

Acta Physica Polonica A

2004

vol. 106

issue 5

715-719

Transport properties of 10μm to 30μm wide grain-boundary junctions ion-etched in thin colossal magnetoresistance La_{0. 7}Sr_{0.3}MnO_3 films deposited on a SrTiO_3 bi-crystal were investigated. We have measured the current-voltage characteristics in the temperature range from 4.2 K to 300 K without applied magnetic field, as well as the magnetoresistance at magnetic fields up to±10 kOe directed parallel to the film surface, both perpendicular and parallel to the direction of current flow through the junctions. The investigated junctions have nonlinear current-voltage characteristics in this temperature range and consist of several magnetic domains. The maximum magnetoresistance (R(H)-R _{max})/R_{max}, measured at 1 kOe was -17.6% at 4.1 K.

Low-Field Magnetoresistance in Manganite Thin Films

84%

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.

Structural, Magnetic and Transport Properties οf NdBaCo_{2}O_{5+x} Thin Films Deposited by Magnetron Sputtering

84%

Vlakhov E., Szymczak R., Baran M., Piotrowski K., Szewczyk A., Paszkowicz W., Lobanovskii L., Matyajasik S., Nenkov K., Szymczak H.

Acta Physica Polonica A

2009

vol. 115

issue 1

89-91

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.

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3 Acta Physica Polonica A

1 2009

1 2004

1 2000

3 Vlakhov E.

2 Nenkov K.

2 Szewczyk A.

1 Abal'oshev A.

1 Baran M.

1 Blagoev B.

1 Chakalov R.

1 Chakalova R.

1 Donchev T.

1 Dörr K.

1 Gierłowski P.

1 Handstein A.

1 Lobanovskii L.

1 Matyajasik S.

1 Müller K.

1 Paszkowicz W.

1 Piotrowski K.

1 Spasov A.

1 Szymczak H.

1 Szymczak R.

1 Walter T.

Search results

La_{0.7}Sr_{0.3}MnO_3 Thin-Film Grain-Boundary Junctions on a Bi-Crystal Substrate

Low-Field Magnetoresistance in Manganite Thin Films

Structural, Magnetic and Transport Properties οf NdBaCo_{2}O_{5+x} Thin Films Deposited by Magnetron Sputtering