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Signature of Intrinsic High‐Temperature Ferromagnetism in Cobalt‐Doped Zinc Oxide Nanocrystals
Author(s) -
Wang X. F.,
Xu J. B.,
Zhang B.,
Yu H. G.,
Wang J.,
Zhang X.,
Yu J. G.,
Li Q.
Publication year - 2006
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.200600396
Subject(s) - ferromagnetism , nanocrystalline material , materials science , dopant , condensed matter physics , doping , nanocrystal , zinc , impurity , hysteresis , cobalt , electron transfer , oxide , nanotechnology , optoelectronics , chemistry , metallurgy , physics , quantum mechanics
Nanocrystalline Zn 1–x Co x O ( x = 0.020, 0.056, and 0.098) powders exhibit intrinsic high‐temperature ferromagnetism , as suggested by the well‐defined hysteresis loops shown in the figure. The origin of this ferromagnetism is thought to be electron transfer from host Zn 4s ↑ states to unfilled dopant Co 3d ↓ states (shown in the inset to the figure), which leads to the formation of a spin‐split impurity band at the Fermi level in the gap.
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