PLD of Fe3O4 thin films: Influence of background gas on surface morphology and magnetic properties

Paramês, M.L.; Mariano, José F.M.L.; Viskadourakis, Z.; Popovici, N.; Rogalski, M.S.; Giapintzakis, J.; Conde, O.

doi:10.1016/j.apsusc.2005.07.090

Cited by 34 publications

(14 citation statements)

References 14 publications

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“…Hence, the density of itinerant electrons on the B sublattice decreases and, in turn, the resistivity increases with increasing δ. This is exactly what is observed in our experiments and reported in literature 20,63 . Actually, for Zn x Fe 3−x O 4 (0 ≤ x ≤ 0.3) single crystals Wang et al report a compositional correspondence x ⇌ 3δ regarding the measured resistivity data 20 .…”

Section: +supporting

confidence: 82%

EpitaxialZnxFe3−xO4thin films: A spintronic material with tunable electrical and magnetic properties

et al. 2009

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The ferrimagnetic spinel oxide ZnxFe3−xO4 combines high Curie temperature and spin polarization with tunable electrical and magnetic properties, making it a promising functional material for spintronic devices. We have grown epitaxial ZnxFe3−xO4 thin films (0 ≤ x ≤ 0.9) on MgO(001) substrates with excellent structural properties both in pure Ar atmosphere and an Ar/O2 mixture by laser molecular beam epitaxy and systematically studied their structural, magnetotransport and magnetic properties. We find that the electrical conductivity and the saturation magnetization can be tuned over a wide range (10 2 . . . 10 4 Ω −1 m −1 and 1.0 . . . 3.2 µB/f.u. at room temperature) by Zn substitution and/or finite oxygen partial pressure during growth. Our extensive characterization of the films provides a clear picture of the underlying physics of the spinel ferrimagnet ZnxFe3−xO4 with antiparallel Fe moments on the A and B sublattice: (i) Zn substitution removes both Fe 3+ A moments from the A sublattice and itinerant charge carriers from the B sublattice, (ii) growth in finite oxygen partial pressure generates Fe vacancies on the B sublattice also removing itinerant charge carriers, and (iii) application of both Zn substitution and excess oxygen results in a compensation effect as Zn substitution partially removes the Fe vacancies. Both electrical conduction and magnetism is determined by the density and hopping amplitude of the itinerant charge carriers on the B sublattice, providing electrical conduction and ferromagnetic double exchange between the mixed-valent Fe

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Section: +supporting

confidence: 82%

EpitaxialZnxFe3−xO4thin films: A spintronic material with tunable electrical and magnetic properties

et al. 2009

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“…However, in these films, one does not always see sharp changes in physical properties as in single crystals across T v . This is particularly remarkable for the magnetization, where sometimes one does not even notice a clear change close to T v [7,8]. We have recently reported some preliminary studies on the deposition of magnetite thin films [10,11].…”

Section: Introductionmentioning

confidence: 93%

“…These make magnetite a potential spintronic material. Many studies on the polycrystalline magnetite films, deposited by different methods have been reported [7][8][9]. However, in these films, one does not always see sharp changes in physical properties as in single crystals across T v .…”

Section: Introductionmentioning

confidence: 98%

Magnetic properties of magnetite thin films close to the Verwey transition

Bohra

Prasad

Venketaramani

et al. 2009

Journal of Magnetism and Magnetic Materials

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“…The diffraction peaks present in the patterns of all the samples indicate magnetite as the sole crystalline phase [26] (ICDD PDF-2 card #01-071-6337). As reported by Mahdavi et al [27] for functionalized MNPs with oleic acid, XRD data showed negligible effects of this fatty acid on the XRD spectra data.…”

Section: Discussionmentioning

confidence: 99%

Impact of Biohybrid Magnetite Nanoparticles and Moroccan Propolis on Adherence of Methicillin Resistant Strains of Staphylococcus aureus

et al. 2016

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Biofilm bacteria are more resistant to antibiotics than planktonic cells. Propolis possesses antimicrobial activity. Generally, nanoparticles containing heavy metals possess antimicrobial and antibiofilm properties. In this study, the ability of adherence of Methicillin Resistant Strains of Staphylococcus aureus (MRSA) to catheters treated with magnetite nanoparticles (MNPs), produced by three methods and functionalized with oleic acid and a hydro-alcoholic extract of propolis from Morocco, was evaluated. The chemical composition of propolis was established by gas chromatography mass spectrometry (GC-MS), and the fabricated nanostructures characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Mossbauer spectroscopy and Fourrier transform infrared spectroscopy (FTIR). The capacity for impairing biofilm formation was dependent on the strain, as well as on the mode of production of MNPs. The co-precipitation method of MNPs fabrication using Fe 3+ and Na 2 SO 3 solution and functionalized with oleic acid and propolis was the most effective in the impairment of adherence of all MRSA strains to catheters (p < 0.001). The adherence of the strain MRSA16 was also significantly lower (p < 0.001) when the catheters were treated with the hybrid MNPs with oleic acid produced by a hydrothermal method. The anti-MRSA observed can be attributed to the presence of benzyl caffeate, pinocembrin, galangin, and isocupressic acid in propolis extract, along with MNPs. However, for MRSA16, the impairment of its adherence on catheters may only be attributed to the hybrid MNPs with oleic acid, since very small amount, if any at all of propolis compounds were added to the MNPs.

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PLD of Fe3O4 thin films: Influence of background gas on surface morphology and magnetic properties

Cited by 34 publications

References 14 publications

EpitaxialZnxFe3−xO4thin films: A spintronic material with tunable electrical and magnetic properties

EpitaxialZnxFe3−xO4thin films: A spintronic material with tunable electrical and magnetic properties

Magnetic properties of magnetite thin films close to the Verwey transition

Impact of Biohybrid Magnetite Nanoparticles and Moroccan Propolis on Adherence of Methicillin Resistant Strains of Staphylococcus aureus

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