Abstract
A series of Co-doped ZnO thin films were prepared under various deposition conditions using the pulsed laser deposition method. X-ray photoelectron spectroscopy (XPS) and XPS depth profiling were used to detect the elemental valence states of Zn, Co and O. It was found that the films deposited under low temperature and high oxygen pressure exhibited intrinsic ferromagnetic properties due to oxidation of Co (Co2+) from the material. However, when the films were deposited under high temperature and low oxygen pressure, metallic cobalt (Co0) appeared and the ferromagnetism was greatly enhanced.
Highlights
Diluted magnetic semiconductors (DMSs) in which transition metals (TMs) are doped into semiconductors exhibiting room-temperature ferromagnetism (RTFM) have attracted much attention for their potential use in spintronic devices.[1]
In order to explore the impact of metallic cobalt on the mechanism of ferromagnetic exchange interactions in Co-doped ZnO, we prepared a series of Co-doped ZnO thin films by the pulsed laser deposition (PLD) method
Our x-ray photoelectron spectroscopy (XPS) results shown in figure 5 and magnetic properties point to the fact that, strong RTFM is due to the metallic cobalt clusters
Summary
Diluted magnetic semiconductors (DMSs) in which transition metals (TMs) are doped into semiconductors exhibiting room-temperature ferromagnetism (RTFM) have attracted much attention for their potential use in spintronic devices.[1]. Role of cobalt in room-temperature ferromagnetic Co-doped ZnO thin films Hou College of Physics and Electronics, Shandong Normal University, Jinan 250014, P.R. China (Received 2 August 2011; accepted 20 December 2011; published online 23 March 2012)
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