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http://dx.doi.org/10.6117/kmeps.2018.25.4.137

The Effects of ZnO Sub-layer Thickness on the Room Temperature Ferromagnetism of (ZnO/Co) Multilayer  

Kang, Sung-geun (Amkor Technology Korea)
Kim, Sungdong (Dept. of Mechanical System Eng. Seoul National University of Science and Technology)
Publication Information
Journal of the Microelectronics and Packaging Society / v.25, no.4, 2018 , pp. 137-142 More about this Journal
Abstract
Room temperature ferromagnetism of Co doped ZnO was studied using (ZnO/Co) multilayer structure, and the effects of ZnO sub-layer thickness on the RT ferromagnetism was investigated. As for the as-deposited state, the diamagnetism was observed for ($ZnO\;20{\AA}/Co\;x{\AA}$) while the ferromagnetism was observed for ($ZnO\;40{\AA}/Co\;x{\AA}$). After vacuum-annealed, both showed the RT ferromagnetism and ($ZnO\;40{\AA}/Co\;x{\AA}$) structure interestingly showed negative remanence magnetization behavior. UV-Vis spectrometer revealed that Co atoms were substituted with Zn in ZnO and Co cluster was not found in XPS and HRTEM EDS analysis.
Keywords
ferromagnetism; DMS; ZnO; Co; multilayer;
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