Shell-driven magnetic stability in core-shell nanoparticles

The magnetic properties of ferromagnetic-antiferromagnetic Co-CoO core-shell nanoparticles are investigated as a function of the in-plane coverage density from 3.5% to 15%. The superparamagnetic blocking temperature, the coercivity, and the bias field radically increase with increasing coverage. Thi...

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Bibliographic Details
Published inPhysical review letters Vol. 97; no. 15; p. 157203
Main Authors Nogués, J, Skumryev, V, Sort, J, Stoyanov, S, Givord, D
Format Journal Article
LanguageEnglish
Published United States 13.10.2006
Subjects
Cobalt - chemistry
Magnetics
Metal Nanoparticles - chemistry
Oxides - chemistry
Temperature
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Summary:The magnetic properties of ferromagnetic-antiferromagnetic Co-CoO core-shell nanoparticles are investigated as a function of the in-plane coverage density from 3.5% to 15%. The superparamagnetic blocking temperature, the coercivity, and the bias field radically increase with increasing coverage. This behavior cannot be attributed to the overall interactions between cores. Rather, it can be semiquantitatively understood by assuming that the shells of isolated core-shell nanoparticles have strongly degraded magnetic properties, which are rapidly recovered as nanoparticles come into contact.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.97.157203