Electronic structure and magnetism in transition metals doped 8-hydroxy-quinoline aluminum.
We report the room-temperature ferromagnetism in transition metals (Co, Ni)-doped 8-hydroxy-quinoline aluminum (Alq3) by thermal coevaporation of high purity metal and Alq3 powders. For 5% Co-doped Alq3, a maximum magnetization of approximately 0.33 microB/Co at 10 K was obtained and ferromagnetic behavior was observed up to 300 K. The Co atoms interact chemically with O atoms and provide electrons to Alq3, forming new states acting as electron trap sites. From this, it is suggested that ferromagnetism may be associated with the strong chemical interaction of Co atoms and Alq3 molecules.
Baik
Jeong Min
JM
Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, Kyungbuk 790-784, Korea.
Shon
Yoon
Y
Lee
Seung Joo
SJ
Jeong
Yoon Hee
YH
Kang
Tae Won
TW
Lee
Jong-Lam
JL