Enhanced room temperature ferromagnetism in Cr-doped ZnO nanoparticles prepared by auto-combustion method  

作　　者：Khizar-ul Haq M.Irfan Muhammad Masood Murtaza Saleem Tahir Iqbal Ishaq Ahmad M.A.Khan M.Zaffar Muhammad Irfan 

机构地区：[1]Department of Physics, Mirpur University of Science and Technology (MUST) [2]Department of Physics, SBASST, Lahore University of Management Sciences [3]Experimental Physics Labs, National Centre for Physics, Quaid-e-Azam University [4]Department of Physics, University of Azad Jammu and Kashmir Muzaffarabad

出　　处：《Journal of Semiconductors》2018年第4期20-27,共8页半导体学报（英文版）

基　　金：Project supported by the Office of Research,Innovation,and Commercialization(ORIC),MUST Mirpur(AJK)

摘　　要：Zn1-xCrxO （x = 0.00, 0.01, 0.03, 0.05, 0.07, and 0.09） nanoparticles were synthesized, by an auto-com- bustion method. Structural, optical, and magnetic characteristics of Cr-doped ZnO samples calcined at 600 ℃ have been analyzed by using X-ray diffraction （XRD）, field emission scanning electron microscope （FESEM）, UV-Vis spectroscopy and vibrating sample magnetometer （VSM）. The XRD data confirmed the hexagonal wurtzite structure of pure and Cr-doped ZnO nanoparticles. The calculated values of grain size using Scherrer＇s formula are in the range of 30.7-9.2 nm. The morphology of nanopowders has been observed by FESEM, and EDS results con- firmed a systematic increase of Cr content in the samples and clearly indicate with no impurity element. The band gaps, computed by UV-Vis spectroscopy, are in the range of 2.83-2.35 eV for different doping concentrations. By analyzing VSM data, significantly enhanced room temperature ferromagnetism is identified in Cr-doped ZnO samples. The value of magnetization is a 12 times increased of the value reported by Daun et al. （2010）. Room temperature ferromagnetism of the nanoparticles is of vital prominence for spintronics applications.Zn1-xCrxO （x = 0.00, 0.01, 0.03, 0.05, 0.07, and 0.09） nanoparticles were synthesized, by an auto-com- bustion method. Structural, optical, and magnetic characteristics of Cr-doped ZnO samples calcined at 600 ℃ have been analyzed by using X-ray diffraction （XRD）, field emission scanning electron microscope （FESEM）, UV-Vis spectroscopy and vibrating sample magnetometer （VSM）. The XRD data confirmed the hexagonal wurtzite structure of pure and Cr-doped ZnO nanoparticles. The calculated values of grain size using Scherrer＇s formula are in the range of 30.7-9.2 nm. The morphology of nanopowders has been observed by FESEM, and EDS results con- firmed a systematic increase of Cr content in the samples and clearly indicate with no impurity element. The band gaps, computed by UV-Vis spectroscopy, are in the range of 2.83-2.35 eV for different doping concentrations. By analyzing VSM data, significantly enhanced room temperature ferromagnetism is identified in Cr-doped ZnO samples. The value of magnetization is a 12 times increased of the value reported by Daun et al. （2010）. Room temperature ferromagnetism of the nanoparticles is of vital prominence for spintronics applications.

关 键 词：Cr-doped ZnO AUTO-COMBUSTION DMS FERROMAGNETISM 

分 类 号：O614.241[理学—无机化学] TB383.1[理学—化学]