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- Kumar, P. AnilUppsala universitet,Institutionen för teknikvetenskaper,Uppsala Univ, Dept Engn Sci, Box 534, SE-75121 Uppsala, Sweden. (author)
Superspin glass state and exchange bias in amorphous Fe/Fe-O core/shell nanoparticles
- Article/chapterEnglish2014
Publisher, publication year, extent ...
- 2014-07-22
- IOP Publishing,2014
- printrdacarrier
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- LIBRIS-ID:oai:DiVA.org:uu-306337
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-306337URI
- https://doi.org/10.1088/2053-1591/1/3/036103DOI
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- Language:English
- Summary in:English
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- 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.
Subject headings and genre
- TEKNIK OCH TEKNOLOGIER Nanoteknik hsv//swe
- ENGINEERING AND TECHNOLOGY Nano-technology hsv//eng
- amorphous nanoparticles
- magnetic nanoparticles
- iron
- iron oxide
- superspin glass
- exchange bias
Added entries (persons, corporate bodies, meetings, titles ...)
- Singh, GurvinderNorwegian Univ Sci & Technol NTNU, Dept Chem Engn, N-7491 Trondheim, Norway. (author)
- Glomm, Wilhelm R.SINTEF Mat & Chem, Biotechnol & Nanomed Sect, N-7491 Trondheim, Norway. (author)
- Peddis, DavideISM CNR, I-00016 Monterotondo, Italy. (author)
- Wahlstroem, ErikNorwegian Univ Sci & Technol NTNU, Dept Phys, N-7491 Trondheim, Norway. (author)
- Mathieu, RolandUppsala universitet,Fasta tillståndets fysik,Uppsala Univ, Dept Engn Sci, Box 534, SE-75121 Uppsala, Sweden.(Swepub:uu)rma26208 (author)
- Uppsala universitetInstitutionen för teknikvetenskaper (creator_code:org_t)
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- In:Materials Research Express: IOP Publishing1:32053-1591
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