1. Magnetic anisotropy of polycrystalline magnetoferritin investigated by SQUID and electron magnetic resonance
- Author
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European Commission, Engineering and Physical Sciences Research Council (UK), University of Manchester, ARAID Foundation, Ministerio de Ciencia e Innovación (España), Consejo Superior de Investigaciones Científicas (España), Diputación General de Aragón, Moro, Fabrizio, Miguel, Rocío de, Jenkins, Mark, Gómez-Moreno, C., Lostao, Anabel, Luis, Fernando, Slageren, Joris van, European Commission, Engineering and Physical Sciences Research Council (UK), University of Manchester, ARAID Foundation, Ministerio de Ciencia e Innovación (España), Consejo Superior de Investigaciones Científicas (España), Diputación General de Aragón, Moro, Fabrizio, Miguel, Rocío de, Jenkins, Mark, Gómez-Moreno, C., Lostao, Anabel, Luis, Fernando, and Slageren, Joris van
- Abstract
Magnetoferritin 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.
- Published
- 2014