Sodium Doping Could Enhance the Room Temperature Ferromagnetism of (ZnO):Mn Diluted Magnetic Semiconductors

• Published in: Integrated ferroelectrics Vol. 137; no. 1; pp. 173 - 178
• Main Authors: Gao, Qian, Fan, Ming, Qi, Yang, Wang, Lianfeng, Sun, Benzhe
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis Group 01.01.2012; Taylor & Francis Ltd
• Subjects: (ZnO):Mn; Chemical synthesis; Coercive force; diluted magnetic semiconductor; Doping; Ferroelectrics; Ferromagnetism; Magnetism; Magnetization; Manganese; Nanocrystals; room temperature ferromagnetism; Semiconductor doping; Sodium; Temperature; Wurtzite
• ISSN: 1058-4587; 1607-8489
• DOI: 10.1080/10584587.2012.687335

Zn 0.995-y Mn 0.005 Na y O (y = 0.00 to 0.010) nano-crystal powders are synthesized by a sol-gel method. All samples have ferromagnetism at room temperature and are composed of wurtzite ZnO with hexagonal structure without any secondary phases. The ferromagnetism is enhanced while 0.005 ≤ y ≤ 0.007 (Na:Mn = 1:1 to 1.4:1). The sample of Zn 0.988 Mn 0.005 Na 0.007 O has the largest coercivity of 62.018GS; saturation magnetization of 1.751 × 10 −2 μ B /Mn; remain magnetization of 0.6055 × 10 −3 μ B /Mn and magnetic energy product of 1.53823μ B GS/Mn. The ferromagnetic behavior can be attributed to the ferromagnetic exchange induced by bondage p-type carriers.