X-ray spectroscopic study of the charge state and local ordering of room-temperature ferromagnetic Mn-doped ZnO

• Published in: Journal of physics. Condensed matter 2007-04, Vol.19 (17), p.172202-172202
• Main Authors: Guo, J-H, Gupta, Amita, Sharma, Parmanand, Rao, K V, Marcus, M A, Dong, C L, Guillen, J M O, Butorin, S M, Mattesini, M, Glans, P A, Smith, K E, Chang, C L, Ahuja, R
• Format: Article
• Language: English
• Subjects: absorption; als; bulk; Condensed matter: electronic structure, electrical, magnetic, and optical properties; diluted magnetic semiconductor; Exact sciences and technology; Fysik; Magnetic properties and materials; Magnetic semiconductors; NATURAL SCIENCES; NATURVETENSKAP; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other interactions of matter with particles and radiation; Physics; scattering; Studies of specific magnetic materials; thin-films; transition-metal compounds; X-ray absorption and absorption edges; zn1-xcoxo
• ISSN: 0953-8984; 1361-648X; 1361-648X
• DOI: 10.1088/0953-8984/19/17/172202

The charge state and local ordering of Mn doped into a pulsed laser deposited single-phase thin film of ZnO are investigated by using x-ray absorption spectroscopy at the O K-edge, Mn K-edge and L-edge, and x-ray emission spectroscopy at the O K-edge and Mn L-edge. This film is ferromagnetic at room temperature. EXAFS measurement shows that Mn(2+) replaces the Zn site in tetrahedral symmetry, and there is no evidence for either metallic Mn or MnO in the film. Upon Mn doping, the top of O 2p valence band extends into the bandgap, indicating additional charge carriers being created.