Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8156287 | Journal of Magnetism and Magnetic Materials | 2015 | 6 Pages |
Abstract
Single crystal Zn1âxNixO (x=0, 0.02, 0.04, 0.06) hexagonal columns have been synthesized by a simple hydrothermal route. The hexagonal columns of the products are about 3 μm in diameter and about 2 μm in thickness. X-ray diffraction (XRD), Ni K-edge XANES spectra and TEM indicate that the as-prepared samples are single-crystalline wurtzite structure and no metallic Ni or other secondary phases are found in the hexagonal columns. Optical absorption and Raman results further confirm the incorporation of Ni2+ ions in the ZnO lattice. Magnetic measurements indicate that the Zn1âxNixO hexagonal columns exhibited obvious ferromagnetic characteristic at room temperature. The coercive fields (Hc) were obtained to be 135.3, 327.79 and 127.29 Oe for x=0.02, 0.04 and 0.06, respectively. The ferromagnetism was assumed to originate from the exchange interaction between free carriers (holes or electrons) from the valence band and the localized d spins on the Ni ions.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Xingyan Xu, Chuanbao Cao,