Synthesis of ZnFe2O4 nanomagnets by Fe-ion implantation into ZnO and post-annealing |
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| Authors: | Pan Feng Guo Ying Cheng Feng-Feng Fa Tao and Yao Shu-De |
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| Institution: | State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China;Department of Physics, Shaanxi University of Technology, Hanzhong 723001, China;Department of Physics, Shaanxi University of Technology, Hanzhong 723001, China;State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China;State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China;State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China |
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| Abstract: | Fe ions of dose 8 × 1016 cm-2 are implanted into a ZnO single crystal at 180 keV. Annealing at 1073 K leads to the formation of zinc ferrite (ZnFe2O4), which is verified by synchrotron radiation X-ray diffraction (SR-XRD) and X-ray photoelectron spectroscopy (XPS). The crystallographically oriented ZnFe2O4 is formed inside the ZnO with the orientation relationship of ZnFe2O4 (111)//ZnO (0001). Superconducting quantum interference device (SQUID) measurements show that the as-implanted and post-annealing samples are both ferromagnetic at 5 K. The synthesized ZnFe2O4 is superparamagnetic, with a blocking temperature (TB = 25 K), indicated by zero field cooling and field cooling (ZFC/FC) measurements. |
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| Keywords: | Fe implanted|ZnO|ZnFe2O4|superparamagnetic |
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