Six-fold in-plane magnetic anisotropy in Co-implanted ZnO (0001)

Details Six-fold in-plane magnetic anisotropy in Co-implanted ZnO (0001) Six-fold in-plane magnetic anisotropy in Co-implanted ZnO (0001)

2010-04-24

arxiv.org/abs/1004.4291v1

Applied Physics Letters 95, 102502 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 4 figures

Scientific paper

10.1063/1.3223583

Magnetic anisotropies of Co-implanted ZnO (0001) films grown on single-crystalline Al2O3 (11-20) substrates have been studied by ferromagnetic resonance (FMR) technique for different cobalt implantation doses. The FMR data show that the easy and hard axes have a periodicity of 60 degrees in the film plane, in agreement with the hexagonal structure of the ZnO films. This six-fold in-plane magnetic anisotropy, which is observed for the first time in ZnO-based diluted magnetic semiconductors, is attributed to the substitution of cobalt on Zn sites in the ZnO structure, and a clear indication for long range ferromagnetic ordering between substitutional cobalt ions in the single-crystalline ZnO films.

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