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Observation of ferromagnetic ordering in Mn‐doped 8‐hydroxy‐quinoline aluminum
Author(s) -
Baik Jeong Min,
Lee JongLam,
Shon Yoon,
Kang Tae Won
Publication year - 2008
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.200701252
Subject(s) - ferromagnetism , quinoline , doping , materials science , band gap , aluminium , magnetization , evaporation , electron , analytical chemistry (journal) , chemistry , condensed matter physics , crystallography , metallurgy , optoelectronics , magnetic field , organic chemistry , physics , quantum mechanics , thermodynamics
The ferromagnetic property of Mn‐doped 8‐hydroxy‐quinoline aluminum (Alq 3 ), synthesized by thermal co‐evaporation of pure Mn metals and Alq 3 powders, was investigated. The weak ferromagnetic property was observed in 5%‐doped Alq 3 , with saturation magnetization of around 0.05 μ B /Mn. The doped Mn chemically interacted with O atoms, producing a new gap state at 0.34 eV above the highest occupied molecular orbital and reducing the effective electron concentration. This led to the decrease of the electron affinity and increase of the optical bandgap, resulting in the reduction of the hole‐injection barrier in comparison with the electron‐injection barrier to the Alq 3 layer. From these, the origin of the observed ferromagnetism is suggested. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)