Magnetoresistive effect in nanosized strontium ferromolybdate with dielectric interlayers
Monophasic iron ferromolybdate nanopowders with a double perovskite structure have been synthesized using the citrate-gel technique at pH=4. A superstructural ordering degree of the iron and molybdenum cations of 88% has been obtained. X-ray diffraction of pressed Sr2FeMoO6−δ pellets subjected to an...
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doaj-c055f4e8c00343e0906c728ae0505bc22021-04-02T11:51:21ZengPensoft PublishersModern Electronic Materials2452-17792016-12-012410611110.1016/j.moem.2017.01.002Magnetoresistive effect in nanosized strontium ferromolybdate with dielectric interlayersMarta V. Yarmolich0Nikolay A. Kalanda1Ivan А. Svito2Aliaksandr L. Zhaludkevich3Nikolai A. Sobolev4Scientific-Practical Materials Research Centre of the NAS of Belarus, 19 P. Brovka Str., Minsk 220072, BelarusScientific-Practical Materials Research Centre of the NAS of Belarus, 19 P. Brovka Str., Minsk 220072, BelarusBelarusian State University, 4 Nezavisimosti Avenue, Minsk 220030, BelarusScientific-Practical Materials Research Centre of the NAS of Belarus, 19 P. Brovka Str., Minsk 220072, BelarusDepartamento de Física and I3N, Universidade de Aveiro, Aveiro 3810-193, PortugalMonophasic iron ferromolybdate nanopowders with a double perovskite structure have been synthesized using the citrate-gel technique at pH=4. A superstructural ordering degree of the iron and molybdenum cations of 88% has been obtained. X-ray diffraction of pressed Sr2FeMoO6−δ pellets subjected to annealing at T=700 K and p(O2)=10 Pa has revealed the formation of the SrMoO4 phase at grain boundaries. The temperature dependence of the electrical resistivity in the range from 4.2 to 300 K switches from a metal type one in the monophasic Sr2FeMoO6-δ to a semiconductor type one in the Sr2FeMoO6−δ–SrMoO4–Sr2FeMoO6−δ structure containing dielectric interlayers, indicating variable range hopping in the latter. In the applied magnetic fields the temperature dependence does not change qualitatively; however, the resistivity decreases with increasing field, i.e., a negative magnetoresistance of up to 41% at T=10 K and B=8 T is observed. The external field forms a collinear spin structure, thus increasing the spin-polarized current through the granular Sr2FeMoO6−δ–SrMoO4–Sr2FeMoO6−δ heterostructure.http://www.sciencedirect.com/science/article/pii/S2452177917300129Strontium ferromolybdateFerrimagneticSol-gel synthesisDielectric interlayersElectrical resistivityMagnetoresistance |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Marta V. Yarmolich Nikolay A. Kalanda Ivan А. Svito Aliaksandr L. Zhaludkevich Nikolai A. Sobolev |
spellingShingle |
Marta V. Yarmolich Nikolay A. Kalanda Ivan А. Svito Aliaksandr L. Zhaludkevich Nikolai A. Sobolev Magnetoresistive effect in nanosized strontium ferromolybdate with dielectric interlayers Modern Electronic Materials Strontium ferromolybdate Ferrimagnetic Sol-gel synthesis Dielectric interlayers Electrical resistivity Magnetoresistance |
author_facet |
Marta V. Yarmolich Nikolay A. Kalanda Ivan А. Svito Aliaksandr L. Zhaludkevich Nikolai A. Sobolev |
author_sort |
Marta V. Yarmolich |
title |
Magnetoresistive effect in nanosized strontium ferromolybdate with dielectric interlayers |
title_short |
Magnetoresistive effect in nanosized strontium ferromolybdate with dielectric interlayers |
title_full |
Magnetoresistive effect in nanosized strontium ferromolybdate with dielectric interlayers |
title_fullStr |
Magnetoresistive effect in nanosized strontium ferromolybdate with dielectric interlayers |
title_full_unstemmed |
Magnetoresistive effect in nanosized strontium ferromolybdate with dielectric interlayers |
title_sort |
magnetoresistive effect in nanosized strontium ferromolybdate with dielectric interlayers |
publisher |
Pensoft Publishers |
series |
Modern Electronic Materials |
issn |
2452-1779 |
publishDate |
2016-12-01 |
description |
Monophasic iron ferromolybdate nanopowders with a double perovskite structure have been synthesized using the citrate-gel technique at pH=4. A superstructural ordering degree of the iron and molybdenum cations of 88% has been obtained. X-ray diffraction of pressed Sr2FeMoO6−δ pellets subjected to annealing at T=700 K and p(O2)=10 Pa has revealed the formation of the SrMoO4 phase at grain boundaries. The temperature dependence of the electrical resistivity in the range from 4.2 to 300 K switches from a metal type one in the monophasic Sr2FeMoO6-δ to a semiconductor type one in the Sr2FeMoO6−δ–SrMoO4–Sr2FeMoO6−δ structure containing dielectric interlayers, indicating variable range hopping in the latter. In the applied magnetic fields the temperature dependence does not change qualitatively; however, the resistivity decreases with increasing field, i.e., a negative magnetoresistance of up to 41% at T=10 K and B=8 T is observed. The external field forms a collinear spin structure, thus increasing the spin-polarized current through the granular Sr2FeMoO6−δ–SrMoO4–Sr2FeMoO6−δ heterostructure. |
topic |
Strontium ferromolybdate Ferrimagnetic Sol-gel synthesis Dielectric interlayers Electrical resistivity Magnetoresistance |
url |
http://www.sciencedirect.com/science/article/pii/S2452177917300129 |
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1721571097865879552 |