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

AutorMoro, Fabrizio; Miguel, Rocío de; Jenkins, Mark; Gómez-Moreno, C.; Lostao, Anabel; Luis, Fernando; Slageren, Joris van
Palabras claveElectron magnetic resonance
Magnetoferritin
Magnetic anisotropy
SQUID
Fecha de publicación2014
EditorElsevier
CitaciónJournal of Magnetism and Magnetic Materials 361: 188-196 (2014)
ResumenMagnetoferritin 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.
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Versión del editorhttp://dx.doi.org/10.1016/j.jmmm.2014.02.053
URIhttp://hdl.handle.net/10261/118351
DOI10.1016/j.jmmm.2014.02.053
Identificadoresdoi: 10.1016/j.jmmm.2014.02.053
issn: 0304-8853
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