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Published version

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2014-03-10

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/52823

Direct Observation of Magnetic Metastability in Individual Iron Nanoparticles

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http://dx.doi.org/10.1103/PhysRevLett.112.107201

Abstract

X-ray photoemission electron microscopy combined with x-ray magnetic circular dichroism is used to study the magnetic properties of individual iron nanoparticles with sizes ranging from 20 down to 8 nm. While the magnetocrystalline anisotropy of bulk iron suggests superparamagnetic behavior in this size range, ferromagnetically blocked particles are also found at all sizes. Spontaneous transitions from the blocked state to the superparamagnetic state are observed in single particles and suggest that the enhanced magnetic energy barriers in the ferromagnetic particles are due to metastable, structurally excited states with unexpected life times

Subject

Ferro, Nanopartícules, Metaestabilitat, Ferromagnetisme, Matèria condensada, Microscòpia electrònica

Subject (English)

Iron, Nanoparticles, Metastability, Ferromagnetism, Condensed matter, Electron microscopy

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Articles publicats en revistes (Física de la Matèria Condensada)

Citation

BALAN, Ana, et al. Direct Observation of Magnetic Metastability in Individual Iron Nanoparticles. Physical Review Letters. 2014. Vol. 112, num. 107201-1-107201-5. ISSN 0031-9007. [consulted: 11 of August of 2026]. Available at: https://hdl.handle.net/2445/52823

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