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Superspin glass state and exchange bias in amorphous Fe/Fe-O core/shell nanoparticles
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. Uppsala Univ, Dept Engn Sci, Box 534, SE-75121 Uppsala, Sweden..
Norwegian Univ Sci & Technol NTNU, Dept Chem Engn, N-7491 Trondheim, Norway..
SINTEF Mat & Chem, Biotechnol & Nanomed Sect, N-7491 Trondheim, Norway..
ISM CNR, I-00016 Monterotondo, Italy..
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2014 (English)In: MATERIALS RESEARCH EXPRESS, ISSN 2053-1591, Vol. 1, no 3, 036103Article in journal (Refereed) Published
Abstract [en]

Nanoparticles of iron and iron oxide are widely explored in several biomedical and technological applications. We report on the magnetic properties of amorphous Fe/Fe-O core/shell nanoparticles compared to those of a reference system with crystalline Fe-O nanoparticles. These nanoparticles are prepared by thermal decomposition of iron precursor, where the amorphous and crystalline nature of core and shell is determined by the choice and concentration of the ligand. The crystalline system exhibits a blocking temperature higher than 300K and negligible exchange bias effect. In contrast, the amorphous systems display large exchange bias, and collective magnetic behavior at low temperatures, with features of magnetic frustration and disorder reminiscent of those observed in spin glass and superspin glass systems. We discuss the origin of the dynamical magnetic behavior of the amorphous particles and study the dependence of the exchange bias field on the cooling field.

Place, publisher, year, edition, pages
2014. Vol. 1, no 3, 036103
Keyword [en]
amorphous nanoparticles, magnetic nanoparticles, iron, iron oxide, superspin glass, exchange bias
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:uu:diva-306337DOI: 10.1088/2053-1591/1/3/036103ISI: 000209665200080OAI: oai:DiVA.org:uu-306337DiVA: diva2:1049319
Funder
Swedish Research CouncilThe Swedish Foundation for International Cooperation in Research and Higher Education (STINT)Göran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of Technology
Available from: 2016-11-24 Created: 2016-10-27 Last updated: 2016-11-24Bibliographically approved

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Mathieu, Roland
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