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Structure and magnetism in Fe/FexPd1−xcore/shell nanoparticles formed by alloying in Pd-embedded Fe nanoparticles
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Baker, S. H., Lees, Martin R., Roy, M. and Binns, C. (2013) Structure and magnetism in Fe/FexPd1−xcore/shell nanoparticles formed by alloying in Pd-embedded Fe nanoparticles. Journal of Physics: Condensed Matter, Volume 25 (Number 38). p. 386004. doi:10.1088/0953-8984/25/38/386004 ISSN 0953-8984.
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Official URL: http://dx.doi.org/10.1088/0953-8984/25/38/386004
Abstract
We have investigated atomic structure and magnetism in Fe nanoparticles with a diameter of 2 nm embedded in a Pd matrix. The samples for these studies were prepared directly from the gas phase by co-deposition, using a gas aggregation source and an MBE-type source for the Fe nanoparticles and Pd matrix respectively. Extended absorption fine structure (EXAFS) measurements indicate that there is an appreciable degree of alloying at the nanoparticle/matrix interface; at dilute nanoparticle concentrations, more than half of the Fe atoms are alloyed with Pd. This leads to a core/shell structure in the embedded nanoparticles, with an FexPd1−x shell surrounding a reduced pure Fe core. Magnetism in the nanocomposite samples was probed by means of magnetometry measurements, which were interpreted in the light of their atomic structure. These point to a magnetized cloud of Pd atoms surrounding the embedded nanoparticles which is significantly larger than around single Fe atoms in Pd. The coercivities in the Fe/Pd nanocomposite samples are larger than in FexPd1−x atomic alloys of corresponding composition, which is consistent with exchange coupling between the magnetically harder and softer regions in the nanocomposite samples.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Journal of Physics: Condensed Matter | ||||
Publisher: | Institute of Physics Publishing Ltd. | ||||
ISSN: | 0953-8984 | ||||
Official Date: | 2013 | ||||
Dates: |
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Volume: | Volume 25 | ||||
Number: | Number 38 | ||||
Page Range: | p. 386004 | ||||
DOI: | 10.1088/0953-8984/25/38/386004 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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