Origin of room temperature ferromagnetism in SnO2 films

被引:16
作者
Li, Jing [1 ,2 ,3 ]
Bai, Guohua [1 ]
Jiang, Yinzhu [1 ]
Du, Youwei [3 ]
Wu, Chen [1 ]
Yan, Mi [1 ]
机构
[1] Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China
[2] China Jiliang Univ, Coll Mat Sci & Engn, Hangzhou 310018, Peoples R China
[3] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
Room temperature ferromagnetism; Oxygen vacancies; Thin film growth; Pulsed laser deposition; SnO2; PHOTOLUMINESCENCE PROPERTIES; THIN-FILMS; STRUCTURAL-CHARACTERIZATION; MAGNETIC-PROPERTIES; NANOPARTICLES; NANOWIRES; DEFECTS;
D O I
10.1016/j.jmmm.2016.12.002
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
SnO2 films exhibiting room temperature ferromagnetism (RTFM) have been prepared on Si (001) by pulsed laser deposition. The saturation magnetization (M-s) of the films experiences a decreasing trend followed by increasing with the growth temperature increased from RT to 400 degrees CThe growth temperature affects both the concentration and the location of the oxygen vacancies as the origin of the RTFM. With lower growth temperatures (< 300 degrees C), more oxygen vacancies exist in the inner film for the samples with less crystallinity, resulting in enhanced magnetism. Higher deposition temperature leads to less oxygen vacancies in the inner film but more oxygen defects at the film surface, which is also beneficial to achieve greater magnetism. Various oxygen pressures during growth and post-annealing have also been used to confirm the role of oxygen vacancies. The study demonstrates that the surface oxygen defects and the positively charged monovalent O vacancies (VO+) in the inner film are the origin of the magnetism in SnO2 films.
引用
收藏
页码:545 / 549
页数:5
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