Premium
Size‐Controlled Ex‐nihilo Ferromagnetism in Capped CdSe Quantum Dots
Author(s) -
Seehra Mohindar S.,
Dutta Prasanta,
Neeleshwar Sonnathi,
Chen YangYuan,
Chen Cheng Lung,
Chou Shang Wei,
Chen Chia Chun,
Dong ChungLi,
Chang ChingLin
Publication year - 2008
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200702382
Subject(s) - ferromagnetism , materials science , quantum dot , condensed matter physics , magnetic moment , hysteresis , atom (system on chip) , charge (physics) , fourier transform , crystallography , nanotechnology , physics , quantum mechanics , chemistry , computer science , embedded system
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 χ 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 µ = 0.0075 µ B per Cd surface atom.