Ferromagnetism in cobalt-implanted ZnO
作者： D. P. Norton , M. E. Overberg , S. J. Pearton , K. Pruessner , J. D. Budai
DOI: 10.1063/1.1637719
关键词:
摘要: The magnetic and structural properties of cobalt-implanted ZnO single crystals are reported. High-quality, (110)-oriented single-crystal Sn-doped substrates were implanted at ∼350 °C with Co to yield transition metal concentrations 3–5 at. % in the near-surface (∼2000 A) region. After implantation, samples subject a 5 min rapid thermal annealing 700 °C. Magnetization measurements indicate ferromagnetic behavior, hysteresis observed M vs H behavior T=5 K. Coercive fields ⩽100 Oe this measurement temperature. Temperature-dependent magnetization showed evidence for ordering temperatures >300 K, although was not room Four-circle x-ray diffraction results presence hexagonal phase matrix. From 2θ full width half maximum (FWHM) (110) peak, nanocrystal size is estimated be ∼3.5 nm, which below superparamagnetic limit ...
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