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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机译：在这项研究中，通过简单的水热方法合成了直径为5–8μm的独特的三维Zn 0.98 Mn 0.02 O分级空心微球（HHM）。尤其是，室温磁化强度测量表明，退火后的Zn 0.98 Mn 0.02 的铁磁性（FM）/顺磁性（PM）新型共存，并且只有PM行为。在Ar气体气氛中，分别出现了在673和1,073 K处的> H HHM，而合成后的HHM仅显示纯FM。根据光致发光和拉曼光谱，可以确定随着退火温度的升高，Zn 0.98 Mn 0.02 O HHMs中氧空位的浓度越来越大。提出了与退火过程有关的氧空位相关的磁演化机理。这种新颖的磁性将丰富我们对稀磁半导体的理解。
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