Article
Materials Science, Multidisciplinary
Xiaodong Zhou, Erlei Wang, Xiaodong Lao, Yongmei Wang, Honglei Yuan
Summary: This study investigated room temperature ferromagnetic Cu-doped LiNbO3 thin films and found that the activation of ferromagnetism may be attributed to indirect interactions between oxygen vacancies and dopant ions. The results contribute to elucidating the origin of ferromagnetism in perovskite ferroelectric oxides.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Chemistry, Physical
A. Di Trolio, A. Amore Bonapasta, C. Barone, A. Leo, G. Carapella, S. Pagano, A. Polimeni, A. M. Testa
Summary: The study reveals that Co doping and H irradiation have significant effects on the resistivity and transport properties of ZnO, with Co increasing the resistivity at high temperatures and H counteracting this effect to some extent. Two different thermally activated processes were identified to govern charge transport in the three materials at high and low temperatures, respectively, and it was found that both Co and H reduce the effects of grain boundaries on the transport processes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Kota Udagawa, Mariko Murayama, Xinwei Zhao
Summary: In this study, Co-doped ZnO thin films were fabricated using pulsed laser deposition under different oxygen partial pressures. The research found that the valence state of Co ions was 2+ and the number of oxygen vacancies increased with lowering oxygen partial pressure. The substitution of Co2+ ions for Zn sites in the ZnO lattice was confirmed by UV-visible absorption spectroscopy. The Co-doped ZnO thin films exhibited ferromagnetism at room temperature, and the saturation magnetization showed a strong correlation with the number of oxygen vacancies.
Article
Materials Science, Multidisciplinary
Laya Dejam, Slawomir Kulesza, Jamshid Sabbaghzadeh, Atefeh Ghaderi, Shahram Solaymani, Stefan Talu, Miroslaw Bramowicz, Mitra Amouamouha, Amir Hossein Salehi Shayegan, Amir Hossein Sari
Summary: In this study, thin films of undoped ZnO, ZnO doped with Al, ZnO doped with Cu, and co-doped ZnO with Al and Cu were deposited on quartz substrates using RF sputtering. The samples were investigated for their advanced fractal features, crystalline structure, and optical properties. The results showed that the films had different morphologies and transmission spectra, with the co-doped sample exhibiting the highest transparency in the visible region and a desirable band gap.
RESULTS IN PHYSICS
(2023)
Article
Chemistry, Physical
WooJun Seol, Gopinathan Anoop, Hyeonghun Park, Cheol Woong Shin, Jun Young Lee, Tae Yeon Kim, Wan Sik Kim, Hyunjin Joh, Shibnath Samanta, Ji Young Jo
Summary: In this study, V-doped ZnO thin films with high polarization values were successfully prepared by controlling crystallite size, morphology, and valence state of vanadium, opening up the possibility of utilizing ferroelectric VeZnO in particulate matter filtering devices. The study demonstrated the importance of crystalline properties and valence state of V in determining the ferroelectric and dielectric properties of VeZnO films, with potential applications in air filter coatings for efficient particulate matter filtration.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Optics
Manohar Singh, Anit K. Ambedkar, Shrestha Tyagi, Virendra Kumar, Prashant Yadav, Ashwani Kumar, Yogendra K. Gautam, Beer Pal Singh
Summary: In this study, pure ZnO and Cu-doped ZnO thin films were deposited on a glass substrate using reactive co-sputtering. The structural, morphological, and optical properties of the thin films were characterized. The results showed that Cu doping modified the crystal structure, surface morphology, and optical properties of ZnO thin films. These findings are important for the research and applications of Cu-doped ZnO thin films.
Article
Materials Science, Multidisciplinary
Abdel Khaleq Mousa Alsmadi, Belal Salameh, Maryam Barhoush
Summary: In this study, high-quality copper-doped ZnO films were prepared using the standard spray pyrolysis method. The correlation between magnetic ordering and native defect states in the ZnO lattice was systematically investigated. The results showed that the detected ferromagnetic ordering is intrinsic and induced by the copper dopants. An improvement in ferromagnetic ordering was observed with increasing copper dopant concentration, which was correlated with an increase in oxygen vacancy and zinc interstitial concentrations and a slight decrease in the concentration of zinc vacancies and oxygen interstitial levels. The magnetic ordering mechanism was associated with the long-range ferromagnetic coupling between copper ions mediated by intrinsic defects.
Article
Materials Science, Multidisciplinary
T. Nakamura, H. Kudo, Y. Tsuda, Y. Matsushima, T. Yoshida
Summary: The electrodeposition of metal organic framework (MOF) thin films bridged by terephthalic acid (TPA) allowed the successful conversion to a Co-doped ZnO thin film. The addition of TPA was crucial in blending Zn2+ and Co2+ ions, with a maximum achievable doping concentration of about 8%.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Ismail Benaicha, Ilyass Jellal, Jaouad Mhalla, Atika Fahmi, Mohammed Addou, Ahmed Qachaou, Mounir Fahoume
Summary: This study investigates the effects of Co, Ni doping, and codoping on the structural, optical, and morphological properties of Zinc oxide (ZnO) through both experimental and theoretical approaches. The results show that the presence of doping elements affects the structural parameters, bandgap, and magnetic behavior of ZnO.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Cai-Qin Luo, Si-Cong Zhu, Chi Xu, Shengqiang Zhou, Chi-Hang Lam, Francis Chi-Chung Ling
Summary: Using first-principle calculations, the study investigates the magnetic properties of monovacancies and Sb-related defects in ZnO material. Experimental results confirm the ferromagnetic behavior predicted by the calculations, demonstrating the importance of defects containing V-Zn, V-O, Sb-Zn, Sb-O, Sb-Zn-V-Zn, and Sb-Zn-2V(Zn) in influencing magnetic properties.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Bhubesh Chander Joshi, Aadarsh Kumar Chaudhri
Summary: In this study, Cu-doped ZnO thin films were prepared using the sol-gel method. The doping concentration was found to affect the crystallite size, band gap, and conductivity of the films. The doped films showed p-type conductivity initially but degraded with time. Ambient-exposed films converted to n-type, while vacuum-placed films maintained p-type behavior. It is suggested that if these films are well prepared, protected, and properly passivated, they can be used for optoelectronics devices.
Article
Engineering, Electrical & Electronic
S. D. Lokhande, M. B. Awale, V. D. Mote
Summary: Undoped and Cu-doped ZnO thin films were prepared by spray pyrolysis technique and characterized. The study found that Cu doping led to a decrease in crystallite size, transmittance, and energy band gap values. FESEM analysis revealed a nanoflake morphology, with a decrease in structural sharpness as the Cu concentration increased. Gas sensing analysis showed that the 2% Cu-doped ZnO thin film had the highest ammonia sensing response and the shortest recovery time.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Physical
M. P. F. de Godoy, X. Gratens, V. A. Chitta, A. Mesquita, M. M. de Lima Jr, A. Cantarero, G. Rahman, J. M. Morbec, H. B. de Carvalho
Summary: This study reports on achieving room temperature ferromagnetism in ZnO samples through Co-doping. By introducing controlled defects via heat treatments in a reductive atmosphere and conducting structural analysis and magnetometry, the magnetic behavior is fully explained in terms of the bound magnetic polaron model. The origin of the observed defect-induced ferromagnetism is attributed to the ferromagnetic coupling between Co ions mediated by magnetic polarons due to zinc interstitial defects.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Physics, Multidisciplinary
S. Balamurali, S. Saravanakumar, R. Chandramohan, P. N. Magudeswaran
Summary: In this research, Mn-doped ZnO thin films with different concentrations were grown on a glass substrate using the SILAR technique. The effects of dopant materials on the structural, morphological, optical, and magnetic properties of the films were studied. The results showed that dopants changed the surface morphology and optical properties of the films, with higher Mn concentrations exhibiting ferromagnetism. This transparent DMS material has potential applications in opto-electronics and spintronics.
BRAZILIAN JOURNAL OF PHYSICS
(2021)
Article
Multidisciplinary Sciences
Rui Chen, Fuchuan Luo, Yuzi Liu, Yu Song, Yu Dong, Shan Wu, Jinhua Cao, Fuyi Yang, Alpha N'Diaye, Padraic Shafer, Yin Liu, Shuai Lou, Junwei Huang, Xiang Chen, Zixuan Fang, Qingjun Wang, Dafei Jin, Ran Cheng, Hongtao Yuan, Robert J. Birgeneau, Jie Yao
Summary: The authors have overcome the limitation of vdWs materials being magnetic only at low temperature, by observing room temperature magnetic ordering in Cobalt doped graphene-like Zinc-Oxide. Through various experimental techniques, they have demonstrated clear evidence of spontaneous magnetization in this new material system at room temperature and above, opening up a new path to 2D ferromagnetism with exceptional tunability and robustness.
NATURE COMMUNICATIONS
(2021)