Comparative Study of Room-Temperature Ferromagnetism in Undoped and Mn-Doped CdSe Quantum Dots

被引：2
|
作者：
Nguyen Thi Quynh Hoa [1 ]
Nguyen Hong Quang [2 ]
Nguyen Thi Minh [1 ]
机构：
[1] Vinh Univ, Dept Elect & Telecommun, Vinh, Vietnam
[2] Vinh Univ, Ctr Practice & Expt, Vinh, Vietnam
来源：
IEEE TRANSACTIONS ON MAGNETICS | 2014年 / 50卷 / 06期
关键词：
Magnetic materials; magnetic particles; magnetic semiconductors; CAPPED CDSE; NANOCRYSTALS;
D O I：
10.1109/TMAG.2014.2305173
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We report a comparative study of room-temperature ferromagnetism (RTFM) in undoped and Mn-doped CdSe quantum dots (QDs) synthesized by a pyrolysis method. Both undoped and Mn-doped CdSe QDs exhibited the RTFM with a coercive field of similar to 160 Oe. The magnetic moment of the QDs showed a strong dependence on the QD size, indicating that the RTFM of the QDs was due to an intrinsic effect. The saturation magnetization value of QDs increased with a decreasing of the QD size. Compared with the undoped QDs, the Mn-doped CdSe QDs exhibited the enhancement of saturation magnetization value with a slight doping concentration. By further increasing the Mn doping concentration to 4 at.%, the increase of the saturation magnetization value of the doped-QDs was not observed, which could be attributed to the enhancement of antiferromagnetic coupling between Mn2+ ions.
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页数：4
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