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Novel magnetic behavior of Mn-doped ZnO hierarchical hollow spheres

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Abstract

In this study, unique three-dimensional Zn0.98Mn0.02O hierarchical hollow microspheres (HHMs) with diameters of 5–8 μm have been synthesized by a simple hydrothermal approach. In particular, room-temperature magnetization measurements indicate that novel co-existence of ferromagnetism (FM)/paramagnetism (PM) and only PM behaviors for the as-annealed Zn0.98Mn0.02O HHMs at 673 and 1,073 K, respectively, in Ar gas atmosphere appear, whereas the as-synthesized ones show merely pure FM. Based on the Photoluminescence and Raman spectra, it is confirmed that the concentrations of oxygen vacancies in Zn0.98Mn0.02O HHMs were becoming larger and larger with increasing annealing temperature. Corresponding magnetic evolution mechanism is proposed to relate to oxygen vacancies based on annealing processes. This novel magnetic property will enrich our understanding of diluted magnetic semiconductors.

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Acknowledgments

This study was partially supported by the Program for Science and Technology Innovation Talents in the Universities of Henan Province (No.2008 HASTIT002), the Innovation Scientists and Technicians Troop Construction Projects of Henan Province (No.094100510015), and by the Natural Science Foundation of China under Grant Nos. 20971036 and 51102077.

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Authors and Affiliations

  1. Key Lab for Special Functional Materials of Ministry of Education, Henan University, Kaifeng, 475004, People’s Republic of China

    YaoMing Hao, ShiYun Lou, ShaoMin Zhou, YongQiang Wang, XiLiang Chen, GongYu Zhu, RuiJian Yuan & Ning Li

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  1. YaoMing Hao
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  2. ShiYun Lou
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Correspondence to ShaoMin Zhou.

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Hao, Y., Lou, S., Zhou, S. et al. Novel magnetic behavior of Mn-doped ZnO hierarchical hollow spheres. J Nanopart Res 14, 659 (2012). https://doi.org/10.1007/s11051-011-0659-6

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