Defect-induced weak ferromagnetism in transition metal-doped ZnO nanoparticles
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- 作者：Debabrata Mandal ; Lalit Kumar Sharma ; Samrat Mukherjee
- 刊名：Applied Physics A: Materials Science & Processing
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：122
- 期：12
- 全文大小：2,439 KB
- 刊物类别：Physics and Astronomy
- 刊物主题：Physics
Condensed Matter
Optical and Electronic Materials
Nanotechnology
Characterization and Evaluation Materials
Surfaces and Interfaces and Thin Films
Operating Procedures and Materials Treatment - 出版者：Springer Berlin / Heidelberg
- ISSN：1432-0630
- 卷排序：122
文摘
In this work, citric acid-capped and ethylene glycol-stabilized pristine and transition metal (TM=Co, Fe, Mn and Ni)-doped ZnO nanoparticles with the generic formula Zn1−xTMxO, x = 0.01 and 0.02, have been synthesized by sol–gel method. XRD confirmed the phase purity of all the samples. Average crystallite size calculated from Scherrer formula was within the range of 43 ± 25 nm for different doped samples. The Raman spectra of (Co, Mn and Ni)-doped ZnO show strong E2 (high) and E1 (LO) modes. The synthesized samples also show strong luminescent emission from inherent Zn and O point defects (interstitial and vacancies) along with a sharp excitonic peak centred at 362 nm. Magnetic studies at 300 K reveal that all samples show weak room-temperature ferromagnetism at low magnetic fields with unsaturated M–H plot up to a measuring field of 5 T.