Anomalous magnetic field effects during pulsed injection metal-organic chemical vapor deposition of magnetite films

Zukova, Anna; Teiserskis, A.; Gun’ko, Yu. K.; Sánchez, Ana; Dijken, Sebastiaan van

doi:10.1063/1.3418622

Cited by 7 publications

(4 citation statements)

References 23 publications

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“…Previously, we have demonstrated that the application of a 1 T magnetic field during magnetite film growth significantly alters the magnetic properties without any visible changes in crystalline texture, surface morphology, and film thickness [37]. This anomalous magnetic behaviour was explained by the reduction in antiphase-boundary formation during film growth as it was confirmed by TEM analysis.…”

Section: Introductionmentioning

confidence: 67%

Deposition of Magnetite Nanofilms by Pulsed Injection MOCVD in a Magnetic Field

et al. 2018

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This report is on the growth of Fe3O4 nanofilms on Al2O3(0001) and MgO(001) substrates with and without the presence of an external magnetic field using a pulsed injection metallorganic chemical vapour deposition (PI MOCVD) technique. The effects of growing magnetic oxide nanofilms in a 1 T field have been examined using various instrumental methods. It was found that the application of a magnetic field during PI MOCVD does not drastically alter the crystalline texture, surface morphology, and film thickness, but it significantly modifies the Fe3O4 film magnetisation and coercive field. Moreover, it was shown that the application of a 1 T field during the cooling of the sample also improves the magnetic properties. We believe that the large external field orients the magnetic spin structure at high temperatures (during growth or the initial stages of cool down) and that cooling through local magnetic ordering temperatures at Fe3O4 defect sites subsequently favours a ferromagnetic spin alignment. The control of magnetic properties of magnetite nanofilms by the application of magnetic fields during growth opens up new routes towards the fabrication and application of magnetic thin film devices.

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Section: Introductionmentioning

confidence: 67%

Deposition of Magnetite Nanofilms by Pulsed Injection MOCVD in a Magnetic Field

et al. 2018

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“…In some studies [11,12], it has already been confirmed that the saturation magnetization can increase with the application of magnetic field. Especially in the case of Fe 3 O 4 thin films, 1 T field increases the saturation magnetization for 150%-200% [13]. But so far the reason why the saturation magnetization was increased is still unclear.…”

Section: Resultsmentioning

confidence: 98%

Effects of magnetic flux densities on microstructure evolution and magnetic properties of molecular-beam-vapor-deposited nanocrystalline Fe30Ni70 thin films

Cao

Wang

et al. 2015

Thin Solid Films

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“…In addition, it has been mentioned by some researchers that the presence of oxides, particularly magnetite (Fe 3 O 4 ), on the surface of magnetic materials could have a positive impact on their electromagnetic behaviour (Zukova et al , 2010). In this investigation, the exact composition of the oxides present on the surface of the steel could not be determined by X-ray diffraction, given that they were only found on the surface of the steel in the form of scattered islands and not as a continuous film.…”

Section: Discussionmentioning

confidence: 99%

Oxidation behaviour of amorphous steel: impact on electromagnetic properties

Garza-Caballero

Idárraga-Ospina

García-Gómez

et al. 2017

ACMM

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Purpose High silicon amorphous steels are gaining preference as the material of choice for the fabrication of the core of low and medium power electrical transformers because they present a better electromagnetic behaviour compared to that offered by common grain-oriented and non-oriented high silicon steels. This study aims to investigate the effects that the environmental conditions present during the high temperature annealing of cores exert on the surface oxidation and electromagnetic changes experienced by a commercial amorphous steel alloy. Design/methodology/approach The effect of environmental impact on the correct development of annealing practices during the manufacture process of amorphous steel cores used in distribution transformers was studied by the development of an oxidation reactor. With this installation, it was possible to simulate environmental conditions that could affect the surface of magnetic cores made from amorphous steel. Findings It was found that: the surface oxidation of amorphous steels affects their electromagnetic behaviour, environmentally induced surface degradation can be modelled at laboratory scale and oxide formation does not affect the amorphous condition of the alloy. Originality/value The effect of surface oxidation induced by the existence of water vapour in the annealing process of cores made from amorphous steels and its impact on the electromagnetic behavior of these alloys has been barely studied.

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Anomalous magnetic field effects during pulsed injection metal-organic chemical vapor deposition of magnetite films

Cited by 7 publications

References 23 publications

Deposition of Magnetite Nanofilms by Pulsed Injection MOCVD in a Magnetic Field

Deposition of Magnetite Nanofilms by Pulsed Injection MOCVD in a Magnetic Field

Effects of magnetic flux densities on microstructure evolution and magnetic properties of molecular-beam-vapor-deposited nanocrystalline Fe30Ni70 thin films

Oxidation behaviour of amorphous steel: impact on electromagnetic properties

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