Hole mediated ferromagnetism in Cu-doped ZnO thin films

Details Hole mediated ferromagnetism in Cu-doped ZnO thin films Hole mediated ferromagnetism in Cu-doped ZnO thin films

2011-06-29

arxiv.org/abs/1106.5831v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages, 3 figures

Scientific paper

We report the successful synthesis of ZnO:Cu thin films doped with holes, resulting in room temperature ferromagnetism. Hole doping is achieved by As-diffusion from the GaAs substrate into ZnO films, assisted by thermal annealing. The As-diffusion is probed with the help of x-ray absorption spectra collected at the As K-edge which show enhanced signature of diffusion in the annealed samples. Introduction of holes, due to the As doping, in ZnO films is further evidenced by the Cu L3,2-edge spectra. XMCD and magnetic measurements show that the ferromagnetic interaction between doped Cu ions is enhanced after hole doping.

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