Title :
Co valence by K-edge X-ray absorption spectroscopy, magnetic properties, and structure of polycrystalline bulk Zn1-xCoxO
Author :
Peleckis, G. ; Wang, X.L. ; Liu, R.S. ; Dou, S.X.
Author_Institution :
Inst. for Supercond. & Electron. Mater., Wollongong Univ., NSW, Australia
Abstract :
We report on magnetic properties and a Co K-edge X-ray absorption spectroscopy (XAS) study of polycrystalline bulk Zn1-xCoxO (x=0.10,0.15,0.17) samples. All samples show paramagnetic behavior and no ferromagnetism was observed. XAS results showed that for all samples the valence of Co is 2+. Spin state assessment derived from Currie-Weiss fitting indicated a possible spin state transition from Co2+ high spin to Co2+ low spin. Calculated μeff values for samples with x=0.10 and 0.15 indicated an orbital contribution to the effective magnetic moment of the Co ion.
Keywords :
X-ray absorption; cobalt alloys; crystal structure; magnetoelectronics; paramagnetic materials; zinc alloys; Currie-Weiss fitting; K-edge X-ray absorption spectroscopy; ZnCoO; magnetic moment; magnetic properties; paramagnetic materials; polycrystalline bulk structure; spin state transition; spintronics; Electromagnetic wave absorption; Magnetic materials; Magnetic properties; Magnetoelectronics; Paramagnetic materials; Semiconductor materials; Spectroscopy; Superconducting materials; Temperature; Zinc oxide; Paramagnetic materials; spintronics;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.854689
