Room-temperature ferromagnetism of diamagnetically-doped ZnO aligned nanorods fabricated by vapor reaction

• Published in: Applied physics. A, Materials science & processing Materials science & processing, 2011-02, Vol.102 (2), p.367-371
• Main Authors: Zhou, ShaoMin, Liu, LiSheng, Lou, ShiYun, Wang, YongQiang, Chen, XiLiang, Yuan, HongLei, Hao, YaoMing, Yuan, RuiJian, Li, Ning
• Format: Article
• Language: English
• Subjects: Arrays; Characterization and Evaluation of Materials; Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Devices; Doping; Exact sciences and technology; Ferromagnetism; Machines; Magnetic properties and materials; Magnetic semiconductors; Manufacturing; Materials science; Nanorods; Nanostructure; Nanotechnology; Optical and Electronic Materials; Physics; Physics and Astronomy; Processes; Studies of specific magnetic materials; Surfaces and Interfaces; Thin Films; Zinc oxide
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-010-6011-7

Large-scale monocrystalline oxide-diluted magnetic semiconductor (ODMS) Zn 1− x Bi x O nanorods arrays (NAs) were prepared within a large doping concentration range from 5% to 20% by a simple chemical vapor deposition. X-ray diffraction and high-resolution transmission electron microscopy reveal the monotonous expansion of the lattice constants with increasing Bi content, due to the effective Bi doping. In particular, room-temperature ferromagnetic (RTFM) behavior with Curie temperature over 363.7 K has been observed based on Bi-doped ZnO nanoarrays, whereas undoped ZnO NAs disappear. The RTFM origin is suggested, in which vacancies can be controlled to tune the FM. The as-formed RTFM NAs would have potential applications in many areas of advanced nanotechnology, such as new spintronic devices and magneto-optic components.