Size-Controlled Ex-nihilo Ferromagnetism in Capped CdSe Quantum Dots

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Title:	Size-Controlled Ex-nihilo Ferromagnetism in Capped CdSe Quantum Dots
Authors:	Seehra, Mohindar S.;Dutta, Prasanta;Neeleshwar, Sonnathi;Chen, Yang-yuan;Chen, Cheng-lung;Chou, Shang-wei;Chen, Chia-chun;Dong, Chung-li;張經霖;Chang, Ching-lin
Contributors:	淡江大學物理學系
Keywords:	CdSe;ferromagnetism;magnetic semiconductors;quantum dots
Date:	2008-05
Issue Date:	2010-08-10 09:30:44 (UTC+8)
Publisher:	Weinheim: Wiley - V C H Verlag GmbH & Co. KGaA
Abstract:	Hysteresis loops in D = 1.8 nm CdSe-TOPO nanoparticles show ferromagnetism at 5 K and 300 K. Charge transfer from Cd to the Cd-O bond is shown by arrow in the Fourier transforms amplitudes of the EXAFS k(2)chi data at the Cd K-edge in the smaller 2.8 and 4.1 nm particles. This charge transfer produces holes in the Cd 4d band yielding ferromagnetism varying as 1/D with magnetic moment mu = 0.0075 mu(B) per Cd surface atom.
Relation:	Advanced Materials 20(9), pp.1656-1660
DOI:	10.1002/adma.200702382
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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