Room temperature magnetism of Fe doped CdS nanocrystals

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• 作者：G. Murali^a ; D. Amaranatha Reddy^a ; B. PoornaPrakash^a ; R.P. Vijayalakshmi^a ; ^{vijayaraguru@gmail.com} ; B.K. Reddy^a ; R. Venugopal^b
• 关键词：CdS ; Nanocrystals ; XRD ; EPR ; Ferromagnetism
• 刊名：Physica B
• 出版年：2012
• 期刊代码：53_09214526
• 类别：ph
• 出版时间：15 June, 2012
• 卷：407
• 期：12
• 页码：2084-2088
• 文件大小：889 K

摘要

Undoped and Fe doped CdS nanocrystals with Fe content of 2-5 at%of average crystallite size 1.2-2 nm have been obtained using chemical co-precipitation method with 2-mercaptoethonal as capping agent at 80 掳C. X-ray diffraction (XRD) results showed that the undoped CdS nanocrystals were in mixed phase of cubic and hexagonal, where as the doped CdS nanocrystals were in hexagonal phase. Room-temperature ferromagnetism has been observed in Fe-doped CdS nanocrystals. Magnetic studies indicated diamagnetism in undoped, ferromagnetism in lightly doped (2 and 3 at%) and paramagnetism in samples of higher Fe content (4 and 5 at%). The substitutional incorporation of Fe³⁺ ion in Cd²⁺ sites was reflected in structural and electron paramagnetic resonance (EPR) measurements. Isolated as well as interacting Fe³⁺ ions are observed in EPR.