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Magnetic Nanoparticles pp 31–66Cite as

Structural and Magnetic Properties of Amorphous Co–W Alloyed Nanoparticles

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Abstract

This section is devoted to investigate a system of amorphous Co–W alloy nanoparticles (NPs). The sequential alumina-Co–W deposition technique employed for their preparation allows to obtain self-organized arrays of particles with controlled geometries, i.e., particle sizes and interparticle distances. This potentiality has been expanded to study the magnetic properties of the amorphous Co–W NPs. In particular, we study the open question whether amorphous alloy nanoparticles may support intrinsic magnetic anisotropy, induced by alloying, irrespective of surface effects usually present in NPs systems.

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Notes

  1. 1.

    http://www.trt.thalesgroup.com/ump-cnrs-thales/.

  2. 2.

    http://sai.unizar.es/microscop-mat/.

  3. 3.

    http://icsd.iqfr.csic.es/icsd/.

  4. 4.

    http://www.cnme.es/.

  5. 5.

    http://ina.unizar.es/lma/index.html.

  6. 6.

    http://icsd.iqfr.csic.es/icsd/.

  7. 7.

    EXAFS spectra for the Au-capped Co NPs were recorded during the same experiment and compared to those for the uncapped Co–NPs, both with the same \(t_{\text {Co}}= 0.7\) nm. We found that both systems have fcc structure and very close first near neighbor distances. Their Fourier Transformed EXAFS profiles are almost identical, even for outher coordination shells. The first coordination shell peak in the Co–Au NPs is higher in amplitude than the uncapped ones and it increases with the content of Au in the sample due to the high crystallinity in these noble-metal capped particles. Then, contrary to the case of W deposit, noble metals-capping do not modify the crystal structure of the Co NPs.

  8. 8.

    http://www.sgte.org/.

  9. 9.

    See details of the induced magnetic moments in the W atoms of these samples in Chap. 4.

  10. 10.

    Data obtained from the NIST Electron Effective-Attenuation-Length Database, http://www.nist.gov/srd/nist82.cfm.

  11. 11.

    XMCD measurements at the W \(L_{\text {2,3}}\) edges on these W-capped Co nanoparticles samples have been performed to determine the induced magnetic moment of W. It was found to be on the order of \(\sim \) \(10^{-3} \mu _B/\text {W}\) at 10 K, which is two orders of magnitude lower than the Co moment measured in the samples. These results will be described in detail in Chap. 4.

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  1. Magnetic Spectroscopy, Diamond Light Source Ltd., Didcot, UK

    Adriana I. Figueroa

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Figueroa, A.I. (2015). Structural and Magnetic Properties of Amorphous Co–W Alloyed Nanoparticles. In: Magnetic Nanoparticles. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-07094-0_3

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