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Magnetic anisotropy and superspin glass behaviour of Fe nanoparticles embedded in Cr and Ag matrices

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journal contribution
posted on 2015-10-21, 10:04 authored by D. Peddis, M. T. Qureshi, Stephen H. Baker, Chris Binns, Mervyn Roy, S. Laureti, D. Fiorani, P. Nordblad, R. Mathieu
Static and dynamical magnetic properties of Fe nanoparticles (NPs) embedded in non - magnetic (Ag) and antiferromagnetic (Cr) matrices with a volume filling fraction (VFF) of 10% have been investigated . In both Fe@Ag and Fe@Cr nanocomposites , the Fe nanoparticles have a narrow size distribution, with a mean particle diameter around 2 nm. In both samples , the saturation magnetization reaches that of Fe bulk bcc, suggesting the absence of alloying with the matrices. The coercivity at 5 K is much larger in Fe@Cr than in Fe@Ag as a result of the strong interaction between the Fe NPs and the Cr matrix. Temperature - dependent magnetization and ac - susceptibility measurements point out further evidence of the enhanced inter - particle interaction in the Fe@Cr system . While the behavior of Fe@Ag indicates the presence of weakly interacting magnetic monodomain particles with a wide distribution of blocking temperatures , Fe@Cr behaves like a superspin glass produced by the magnetic interaction between nanoparticles.

History

Citation

Philosophical Magazine, 2015, doi: 10.1080/14786435.2015.1090640

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • AM (Accepted Manuscript)

Published in

Philosophical Magazine

Publisher

Taylor & Francis (Routledge)

issn

0950-0839

eissn

1362-3036

Acceptance date

2015-08-29

Copyright date

2015

Available date

2016-10-27

Publisher version

http://www.tandfonline.com/doi/abs/10.1080/14786435.2015.1090640

Notes

The file associated with this record is under a 12-month embargo from publication in accordance with the publisher's self-archiving policy, available at http://authorservices.taylorandfrancis.com/sharing-your-work/. The full text may be available in the publisher links provided above.

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en

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