Synthesis of ZnFe2O4 nanomagnets by Fe-ion implantation into ZnO and post-annealing

doi:10.1088/1674-1056/20/12/127501

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 (T_B = 25 K), indicated by zero field cooling and field cooling (ZFC/FC) measurements.

Keywords: Fe implanted ZnO ZnFe₂O₄ superparamagnetic

Received: 10 July 2011
Revised: 28 July 2011
Accepted manuscript online:

PACS:	75.50.Pp	(Magnetic semiconductors)
	61.72.uj	(III-V and II-VI semiconductors)
	61.46.Df	(Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots))
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)

Fund: Project supported by the National Basic Research Program of China (Grant No. 2010CB832904), the National Natural Science Foundation of China (Grant Nos. 10875007 and 11005005), and the Research Fund of Shaanxi University of Technology, China (Grant No. SLQ0815).

Cite this article:

Pan Feng(潘峰), Guo Ying(郭颖), Cheng Feng-Feng(成枫锋), Fa Tao(法涛), and Yao Shu-De(姚淑德) Synthesis of ZnFe₂O₄ nanomagnets by Fe-ion implantation into ZnO and post-annealing 2011 Chin. Phys. B 20 127501

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Synthesis of ZnFe2O4 nanomagnets by Fe-ion implantation into ZnO and post-annealing

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Synthesis of ZnFe₂O₄ nanomagnets by Fe-ion implantation into ZnO and post-annealing