TY - JOUR
T1 - Electric and magnetic evolutions in composite assemblies of Fe and Si nano-particles
AU - Sumiyama, Kenji
AU - Yamazaki, Minoru
AU - Kurokawa, Yuichiro
AU - Shinohara, Nobuyuki
AU - Hihara, Takehiko
N1 - Publisher Copyright:
© 2015 The Japan Institute of Metals and Materials.
Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 2015
Y1 - 2015
N2 - Temperature (T)-dependence of electrical resistivity (ρ) and magnetization curves have been observed for Fe and Si nano-particle (NP) composite assemblies prepared using a double-source-plasma-gas-condensation cluster deposition system. With increasing T, ρ monotonically decreases for the Fe composition, cFe < 0.6, where the Si NP networks are predominant (a semiconductor type conduction), while it monotonically increases for cFe > 0.6, where the Fe NP networks are formed (a metallic conduction). With increasing cFe, saturation magnetization monotonically increases, while magnetic coercivity increases for cFe < 0.4 and gradually decreases for cFe > 0.6. In these Fe and Si NP composite assemblies, magnetic dipole interactions between Fe NPs are reinforced by reductions in inter-particle distances though they are averaged by random configurations of Fe and Si NPs, and random orientations of magnetic moments of Fe NPs. Magnetic exchange interactions are also induced but not much enhanced with cFe due to loose contacts between Fe NPs.
AB - Temperature (T)-dependence of electrical resistivity (ρ) and magnetization curves have been observed for Fe and Si nano-particle (NP) composite assemblies prepared using a double-source-plasma-gas-condensation cluster deposition system. With increasing T, ρ monotonically decreases for the Fe composition, cFe < 0.6, where the Si NP networks are predominant (a semiconductor type conduction), while it monotonically increases for cFe > 0.6, where the Fe NP networks are formed (a metallic conduction). With increasing cFe, saturation magnetization monotonically increases, while magnetic coercivity increases for cFe < 0.4 and gradually decreases for cFe > 0.6. In these Fe and Si NP composite assemblies, magnetic dipole interactions between Fe NPs are reinforced by reductions in inter-particle distances though they are averaged by random configurations of Fe and Si NPs, and random orientations of magnetic moments of Fe NPs. Magnetic exchange interactions are also induced but not much enhanced with cFe due to loose contacts between Fe NPs.
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U2 - 10.2320/matertrans.M2014434
DO - 10.2320/matertrans.M2014434
M3 - Article
AN - SCOPUS:84923804171
VL - 56
SP - 292
EP - 296
JO - Materials Transactions
JF - Materials Transactions
SN - 0916-1821
IS - 3
ER -