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high room-temperature magnetization in Co-doped TiO_(2) nanoparticles promoted by vacuum annealing for different durations

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Journal of Semiconductors 2021年第7期42卷 71-77页

作者： Wenqiang Huang Rui Lin Weijie Chen Yuzhu Wang Hong Zhang College of Mechanical and Electrical Engineering Fujian Agriculture and Forestry UniversityFuzhou 350002China

To clarify the contribution of oxygen vacancies to room-temperature ferromagnetism(RTFM)in cobalt doped TiO_(2)(Co-TiO_(2)),and in order to obtain the high level of magnetization suitable for spintronic devices,in this work,Co-TiO_(2) nano-particles are prepared via the sol-gel route,followed by vacuum annealing for different durations,and the influence of vacu-um annealing duration on the structure and room-temperature magnetism of the compounds is *** results reveal that with an increase in annealing duration,the concentration of oxygen vacancies rises steadily,while the saturation magnetiza-tion(Ms)shows an initial gradual increase,followed by a sharp decline,and even *** maximum Ms is as high as 1.19 emu/g,which is promising with respect to the development of spintronic *** analysis reveals that oxygen va-cancies,modulated by annealing duration,play a critical role in tuning room-temperature *** appropriate concentra-tion of oxygen vacancies is beneficial in terms of promoting RTFM in Co-TiO_(2).However,excessive oxygen vacancies will result in a negative impact on RTFM,due to antiferromagnetic superexchange interactions originating from nearest-neighbor Co^(2+)ions.

关键词： Co-doped TiO_(2)nanoparticles room-temperature ferromagnetism different annealing duration oxygen vacancy high magnetization

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Synthesis and Characterization of Iron Nanowires

Synthesis and Characterization of Iron Nanowires

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中国颗粒学会超微颗粒专委会2011年年会暨第七届海峡两岸超微颗粒学术研讨会

作者： Wei-Syuan Lin Zih-Jie Jian Li-Chung Lai Wen-An Chiou Yeu-Kuang Hwu Cheng-Han Chen Wei-Jen Liou Department of Materials Engineering Tatung University NISP Lab Maryland NanoCenterUniv.of MarylandCollege ParkMD 20742-2831USA Institute of Physics Academia SinicaNankangTaipei 115Taiwan“R.O.C”

The iron nanowires(iron NWs) with high magnetization were fabricated via reduction of iron salts with sodium borohydride in a parallel magnetic *** iron nanowires were covered by passivated layers of iron oxide which prevent the oxidation of iron *** morphological,microchemical and structural investigation of the newly synthesized iron nanowires were characterized by using XRD,FE-SEM, HRTEM,EDS,VSM and *** TEM and SEM images showed the diameter and length of the synthesized iron nanowires are around 50-100 nm and 5-10μm, *** spacing obtained from HRTEM images is about 0.202 nm,which is corresponding to the lattice spacing of Fe in(110) ***,we have studied disordered and arrayed iron nanowires’(NWs) magnetic *** field was applied in parallel direction(||) and perpendicular direction(⊥) to the iron NWs array.

关键词： iron nanowires high magnetization squareness ratio

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