Absence of traditional magnetoresistivity mechanisms in Sr2FeMoO6 thin films grown on SrTiO3, MgO and NdGaO3 substrates

M. Saloaro, S. Majumdar, H. Huhtinen, P. Paturi

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)

Abstract

Magnetoresistive double perovskite Sr2FeMoO6 thin films were grown with two different deposition pressures on SrTiO3, MgO and NdGaO3 substrates by pulsed laser deposition and thorough structural, magnetic and magneto-transport characterization was made. According to x-ray diffraction, all the films were phase pure and fully textured. Indication of substrate dependent strain and low angle grain boundaries was found, especially in films on MgO. Both the deposition pressure and the choice of the substrate have a strong influence on the saturation magnetization, Ms, and Curie temperature, TC. The structural and magnetic data indicate the presence of anti-site disorder (ASD) in the films. The temperature dependence of resistivity showed semiconductive behaviour at temperatures below 100 K and metallic behaviour at higher temperatures. The semiconductive behaviour was found to increase with increasing ASD. In good quality films, up to 12% negative magnetoresistance (MR) was observed and films grown on MgO and NGO substrates also showed low field MR. However, the most significant observation of this study was that the magnetoresistivity of these Sr2FeMoO6 thin films could not be explained with any traditional MR mechanism, but carried the clear signature of superposition of different mechanisms, in particular low angle grain boundary tunnelling and suppression of antiferromagnetically ordered domains under a magnetic field.
Original languageEnglish
Article number366003
JournalJournal of Physics: Condensed Matter
Volume24
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

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magnetoresistivity
Magnetoresistance
Thin films
Substrates
thin films
Grain boundaries
grain boundaries
disorders
Saturation magnetization
Pulsed laser deposition
Curie temperature
Perovskite
Temperature
pulsed laser deposition
temperature
indication
x ray diffraction
Diffraction
signatures
strontium titanium oxide

Cite this

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title = "Absence of traditional magnetoresistivity mechanisms in Sr2FeMoO6 thin films grown on SrTiO3, MgO and NdGaO3 substrates",
abstract = "Magnetoresistive double perovskite Sr2FeMoO6 thin films were grown with two different deposition pressures on SrTiO3, MgO and NdGaO3 substrates by pulsed laser deposition and thorough structural, magnetic and magneto-transport characterization was made. According to x-ray diffraction, all the films were phase pure and fully textured. Indication of substrate dependent strain and low angle grain boundaries was found, especially in films on MgO. Both the deposition pressure and the choice of the substrate have a strong influence on the saturation magnetization, Ms, and Curie temperature, TC. The structural and magnetic data indicate the presence of anti-site disorder (ASD) in the films. The temperature dependence of resistivity showed semiconductive behaviour at temperatures below 100 K and metallic behaviour at higher temperatures. The semiconductive behaviour was found to increase with increasing ASD. In good quality films, up to 12{\%} negative magnetoresistance (MR) was observed and films grown on MgO and NGO substrates also showed low field MR. However, the most significant observation of this study was that the magnetoresistivity of these Sr2FeMoO6 thin films could not be explained with any traditional MR mechanism, but carried the clear signature of superposition of different mechanisms, in particular low angle grain boundary tunnelling and suppression of antiferromagnetically ordered domains under a magnetic field.",
author = "M. Saloaro and S. Majumdar and H. Huhtinen and P. Paturi",
year = "2012",
doi = "10.1088/0953-8984/24/36/366003",
language = "English",
volume = "24",
journal = "Journal of Physics: Condensed Matter",
issn = "0953-8984",
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}

Absence of traditional magnetoresistivity mechanisms in Sr2FeMoO6 thin films grown on SrTiO3, MgO and NdGaO3 substrates. / Saloaro, M.; Majumdar, S.; Huhtinen, H.; Paturi, P.

In: Journal of Physics: Condensed Matter, Vol. 24, 366003, 2012.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Absence of traditional magnetoresistivity mechanisms in Sr2FeMoO6 thin films grown on SrTiO3, MgO and NdGaO3 substrates

AU - Saloaro, M.

AU - Majumdar, S.

AU - Huhtinen, H.

AU - Paturi, P.

PY - 2012

Y1 - 2012

N2 - Magnetoresistive double perovskite Sr2FeMoO6 thin films were grown with two different deposition pressures on SrTiO3, MgO and NdGaO3 substrates by pulsed laser deposition and thorough structural, magnetic and magneto-transport characterization was made. According to x-ray diffraction, all the films were phase pure and fully textured. Indication of substrate dependent strain and low angle grain boundaries was found, especially in films on MgO. Both the deposition pressure and the choice of the substrate have a strong influence on the saturation magnetization, Ms, and Curie temperature, TC. The structural and magnetic data indicate the presence of anti-site disorder (ASD) in the films. The temperature dependence of resistivity showed semiconductive behaviour at temperatures below 100 K and metallic behaviour at higher temperatures. The semiconductive behaviour was found to increase with increasing ASD. In good quality films, up to 12% negative magnetoresistance (MR) was observed and films grown on MgO and NGO substrates also showed low field MR. However, the most significant observation of this study was that the magnetoresistivity of these Sr2FeMoO6 thin films could not be explained with any traditional MR mechanism, but carried the clear signature of superposition of different mechanisms, in particular low angle grain boundary tunnelling and suppression of antiferromagnetically ordered domains under a magnetic field.

AB - Magnetoresistive double perovskite Sr2FeMoO6 thin films were grown with two different deposition pressures on SrTiO3, MgO and NdGaO3 substrates by pulsed laser deposition and thorough structural, magnetic and magneto-transport characterization was made. According to x-ray diffraction, all the films were phase pure and fully textured. Indication of substrate dependent strain and low angle grain boundaries was found, especially in films on MgO. Both the deposition pressure and the choice of the substrate have a strong influence on the saturation magnetization, Ms, and Curie temperature, TC. The structural and magnetic data indicate the presence of anti-site disorder (ASD) in the films. The temperature dependence of resistivity showed semiconductive behaviour at temperatures below 100 K and metallic behaviour at higher temperatures. The semiconductive behaviour was found to increase with increasing ASD. In good quality films, up to 12% negative magnetoresistance (MR) was observed and films grown on MgO and NGO substrates also showed low field MR. However, the most significant observation of this study was that the magnetoresistivity of these Sr2FeMoO6 thin films could not be explained with any traditional MR mechanism, but carried the clear signature of superposition of different mechanisms, in particular low angle grain boundary tunnelling and suppression of antiferromagnetically ordered domains under a magnetic field.

U2 - 10.1088/0953-8984/24/36/366003

DO - 10.1088/0953-8984/24/36/366003

M3 - Article

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JO - Journal of Physics: Condensed Matter

JF - Journal of Physics: Condensed Matter

SN - 0953-8984

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