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|Title:||Magnetic anisotropy and superspin glass behaviour of Fe nanoparticles embedded in Cr and Ag matrices|
Qureshi, M. T.
Baker, Stephen H.
|Publisher:||Taylor & Francis (Routledge)|
|Citation:||Philosophical Magazine, 2015, doi: 10.1080/14786435.2015.1090640|
|Abstract:||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.|
|Embargo on file until:||27-Oct-2016|
|Rights:||Copyright © Taylor & Francis. This is an Accepted Manuscript of an article published by Taylor & Francis in Philosophical Magazine Letters on 27 October 2015, available online: doi: 10.1080/14786435.2015.1090640.|
|Description:||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.|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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|Peddis_Fe@Cr_accepted.pdf||Post-review (final submitted)||1.33 MB||Adobe PDF||View/Open|
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