Fabrication and characterisation of diluted magnetic semiconductors thin films using ion beams

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Trans Tech Publication Inc.
The intrinsic n-type (II-VI) semiconductor ZnO may become ferromagnetic at room temperature, by small additions of magnetic ions, resulting in what is called a Diluted Magnetic Semiconductors (DMS). The potential application of DMS in spintronic devices of is driving the research effort to dope magnetic elements into this semiconductors with a depth distribution as uniform as possible. The doping levels and the depth distribution of dopants are critical parameters for the magnetic properties of this material and the possible clustering of dopants can play a significant negative role in its macroscopic magnetic properties. Thin ZnO (0001) films of between 100nm and 500nm, grown on c-Al2O3 by MOCVD were implanted with Co, Eu and Co+Eu by ion irradiation at low energies. In order to improve the depth distribution of dopants, the ion implantation was carried out through a number of appropriately chosen range foils. The results show an increase in the level of dopant homogeneity throughout the entire thickness of the film, and a ferromagnetic behavior above room temperature for Zn0.96Co0.04O, Zn0.96Eu0.04O and Zn0.92Co0.04Eu0.04O. © 2012, Trans Tech Publications
Ion beams, Magnetic properties, Magnetic semiconductors, Thin films, Ferromagnetic materials, Zinc oxides
Ionescu, M., Photongkam, P., Siegele, R., Deslandes, A., Li, S., & Cohen, D. D. (2012). Fabrication and characterisation of diluted magnetic semiconductors thin films using ion beams. Paper presented to the International Conference on processing & manufacturing of advanced materials (THERMEC’2011), 1st-5th August 2011. Quebec City, Canada. In T. Chandra, M. Ionescu and D. Mantovani. (Eds), THERMEC 2011: Materials Science Forum, 706-709, 2869. doi:10.4028/www.scientific.net/MSF.706-709.2869