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Magnetic anisotropy and magnetization dynamics of Fe nanoparticles embedded in Cr and Ag matrices
Inst Struct Matter, Area Ric, Rome, Italy..
Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England.;Hazara Univ, Dept Phys, Mansehra, Pakistan..
Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England..
Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England..
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2015 (English)In: Philosophical Magazine, ISSN 1478-6435, E-ISSN 1478-6443, Vol. 95, no 33, 3798-3807 p.Article in journal (Refereed) Published
Abstract [en]

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 NPs have a narrow size distribution, with a mean particle diameter around 2nm. In both samples, the saturation magnetization reaches that of Fe bulk bcc, suggesting the absence of alloying with the matrices. The coercivity at 5K 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 interparticle interaction in the Fe@Cr system. While the behaviour 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 interactions between NPs.

Place, publisher, year, edition, pages
2015. Vol. 95, no 33, 3798-3807 p.
Keyword [en]
magnetic nanoparticles, nanocomposites, nanomagnetism, exchange bias
National Category
Condensed Matter Physics Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-268396DOI: 10.1080/14786435.2015.1090640ISI: 000364335800007OAI: oai:DiVA.org:uu-268396DiVA: diva2:878530
Funder
Swedish Research CouncilGöran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of Technology
Available from: 2015-12-09 Created: 2015-12-04 Last updated: 2017-12-01Bibliographically approved

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Nordblad, PerMathieu, Roland

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