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Influence of Ag on the Magnetic Anisotropy of Fe3O4 Nanocomposites.

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Title: Influence of Ag on the Magnetic Anisotropy of Fe3O4 Nanocomposites.
Authors: Batista de Jesus, Ana Carla1 (AUTHOR) carlabatista.ita@gmail.com, Santos Barbosa, Cristiane Cupertino1 (AUTHOR) criscupertinob@gmail.com, Barreto Peixoto, Erilaine1 (AUTHOR) erilainepeixoto@gmail.com, de Jesus, Jonathas Rafael1 (AUTHOR) jonathasrafael@gmail.com, da Silva Filho, Jorge Luiz2 (AUTHOR) jorgeluizfh@gmail.com, Fabian, Fernanda Antunes3 (AUTHOR) fernandafabianro@gmail.com, Costa, Ivani Meneses4 (AUTHOR) ivanimcosta@gmail.com, dos Santos Duque, José Gerivaldo1,5 (AUTHOR) gerivaldoduque@gmail.com, de Meneses, Cristiano Teles1,5 (AUTHOR) ctmeneses@gmail.com
Source: Journal of Superconductivity & Novel Magnetism. Aug2019, Vol. 32 Issue 8, p2471-2477. 7p.
Subjects: Magnetic anisotropy, Particle analysis, Infrared absorption, Decomposition method, X-ray diffraction measurement, Concentration functions
Abstract: In this work, the thermal decomposition method is used to obtain Fe3O4-Ag nanocomposites. The weight losses observed in the thermogravimetric measurements are used to estimate the amount of organic mass present in the samples. Fourier-transform infrared (FTIR) spectra show characteristic absorption peaks of the stretching vibration of the Fe-O and C-H groups. Samples are characterized structurally and morphologically by measurements of X-ray diffraction (XRD) and transmission electronic microscopy (TEM), respectively. The XRD patterns indicate the formation of a cubic phase with spinel crystallographic structure. Particles sizes analysis estimated by Scherrer's equation for Fe3O4 phase show that sizes are unaffected by the Ag-insertion. TEM images reveal that the nanoparticles have a spherical-like shape and a mean particles sizes ranging 3 < d < 4 nm. The best fits of zero-field-cooling and field-cooling (ZFC/FC) curves allow us to state that the magnetic anisotropy constant decreasing as a function of Ag concentration. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Superconductivity & Novel Magnetism is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: In this work, the thermal decomposition method is used to obtain Fe3O4-Ag nanocomposites. The weight losses observed in the thermogravimetric measurements are used to estimate the amount of organic mass present in the samples. Fourier-transform infrared (FTIR) spectra show characteristic absorption peaks of the stretching vibration of the Fe-O and C-H groups. Samples are characterized structurally and morphologically by measurements of X-ray diffraction (XRD) and transmission electronic microscopy (TEM), respectively. The XRD patterns indicate the formation of a cubic phase with spinel crystallographic structure. Particles sizes analysis estimated by Scherrer&#39;s equation for Fe3O4 phase show that sizes are unaffected by the Ag-insertion. TEM images reveal that the nanoparticles have a spherical-like shape and a mean particles sizes ranging 3 &lt; d &lt; 4 nm. The best fits of zero-field-cooling and field-cooling (ZFC/FC) curves allow us to state that the magnetic anisotropy constant decreasing as a function of Ag concentration. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Journal of Superconductivity &amp; Novel Magnetism is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10948-018-4970-7
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    Subjects:
      – SubjectFull: Magnetic anisotropy
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      – SubjectFull: Infrared absorption
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