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Title

Magnetic anisotropy of polycrystalline magnetoferritin investigated by SQUID and electron magnetic resonance

AuthorsMoro, Fabrizio; Miguel, Rocío de; Jenkins, Mark; Gómez-Moreno, C.; Lostao, Anabel; Luis, Fernando; Slageren, Joris van
KeywordsElectron magnetic resonance
Magnetoferritin
Magnetic anisotropy
SQUID
Issue Date2014
PublisherElsevier
CitationJournal of Magnetism and Magnetic Materials 361: 188-196 (2014)
AbstractMagnetoferritin molecules with an average inorganic core diameter of 5.7±1.6 nm and polycrystalline internal structure were investigated by a combination of transmission electron microscopy, magnetic susceptibility, magnetization, and electron magnetic resonance (EMR) experiments. The temperature and frequency dependence of the magnetic susceptibility allowed for the determination of the magnetic anisotropy on an experimental time scale which spans from seconds to nanoseconds. In addition, angle-dependent EMR experiments were carried out for the determination of the nanoparticle symmetry and internal magnetic field. Due to the large surface to volume ratio, the nanoparticles show larger and uniaxial rather than cubic magnetic anisotropies compared to bulk maghemite and magnetite. © 2014 Elsevier B.V.
Descriptionet al.
Publisher version (URL)http://dx.doi.org/10.1016/j.jmmm.2014.02.053
URIhttp://hdl.handle.net/10261/118351
DOI10.1016/j.jmmm.2014.02.053
Identifiersdoi: 10.1016/j.jmmm.2014.02.053
issn: 0304-8853
Appears in Collections:(ICMA) Artículos
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