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Title: Magnetism in nanoparticles of semiconducting FeSi2
Authors: Hamdeh, H.H.;Eltabey, M.M.;Ho, J.C.;Lee, P.C.;Chen, K.;Chen, Yang-Yuan
Contributors: 應物所
Keywords: Chemical disorder;Compositional heterogeneity;Fe-ions;Iron disilicide;Low temperatures;Magnetic ordering;Magnetic orders;Magnetic studies;Quadrupoles;Shift parameters;Sommerfeld constant;XRD;Calorimetry;Iron compounds;Molybdenum;Nanoparticles;Specific heat;Spin glass;Superparamagnetism;Nanomagnetics
Date: 2010-08
Issue Date: 2015-06-29 17:21:41 (UTC+8)
Abstract: Iron disilicide has been found to exhibit superparamagnetism in nanoparticles, even though no magnetic ordering occurs in bulk. The unexpected behavior was attributed, based on magnetic studies, to chemical disorder. A lack of sextet-type signals in Mössbauer spectra supports that the observed magnetic order is confined to only a very small fraction of magnetic Fe ions. Moreover, quadrupole-splitting and isomer-shift parameters reveal a significant amount of Fe in a short-range α-FeSi2 structure, while XRD suggests an overall β-FeSi2 structure. Such a compositional heterogeneity is also reflected in a calorimetrically obtained spin-glass-like anomaly at low temperatures. Meanwhile, as the particle size decreases, specific heat and Sommerfeld constant are enhanced due to lattice softening and the emergence of surface charge density of states, respectively, in nanoparticles. © 2010 Elsevier B.V. All rights reserved.
Relation: Journal of Magnetism and Magnetic Materials, 322(15), 2227-2230
Data Type: article
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Appears in Collections:[應用物理研究所 ] 期刊論文

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