Room temperature ferromagnetism in un-doped amorphous HfO2 nano-helix arrays

doi:10.1088/1674-1056/24/5/057503

中国物理B ›› 2015, Vol. 24 ›› Issue (5): 57503-057503.doi: 10.1088/1674-1056/24/5/057503

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Room temperature ferromagnetism in un-doped amorphous HfO₂ nano-helix arrays

谢谦, 王炜鹏, 谢拯, 战鹏, 李正操, 张政军

The Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

收稿日期:2014-09-04 修回日期:2014-12-18 出版日期:2015-05-05 发布日期:2015-05-05
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51372135 and 61176003) and the Tsinghua University Initiative Scientific Research Program, China.

Room temperature ferromagnetism in un-doped amorphous HfO₂ nano-helix arrays

Xie Qian (谢谦), Wang Wei-Peng (王炜鹏), Xie Zheng (谢拯), Zhan Peng (战鹏), Li Zheng-Cao (李正操), Zhang Zheng-Jun (张政军)

The Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Received:2014-09-04 Revised:2014-12-18 Online:2015-05-05 Published:2015-05-05
Contact: Zhang Zheng-Jun E-mail:zjzhang@tsinghua.edu.cn
About author:75.75.-c; 75.75.Cd; 68.55.Ln; 68.35.bj
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51372135 and 61176003) and the Tsinghua University Initiative Scientific Research Program, China.

摘要/Abstract

摘要： Amorphous HfO₂ nano-helix arrays with different screw pitches were fabricated by the glancing angle deposition technique. Room temperature ferromagnetism was achieved in this undoped amorphous HfO₂ nanostructure, which is attributed to singly charged oxygen vacancies. The different magnetic behavior and photoluminescence in flat film and nano-helix arrays originate from the distinction of defect components. This study could facilitate the understanding of ferromagnetism origin in undoped HfO₂, it also suggests a possible way to alter the intrinsic defects in amorphous HfO₂.

关键词: hafnium oxide, amorphous nanostructure, oxygen vacancy, room temperature ferromagnetism

Abstract: Amorphous HfO₂ nano-helix arrays with different screw pitches were fabricated by the glancing angle deposition technique. Room temperature ferromagnetism was achieved in this undoped amorphous HfO₂ nanostructure, which is attributed to singly charged oxygen vacancies. The different magnetic behavior and photoluminescence in flat film and nano-helix arrays originate from the distinction of defect components. This study could facilitate the understanding of ferromagnetism origin in undoped HfO₂, it also suggests a possible way to alter the intrinsic defects in amorphous HfO₂.

Key words: hafnium oxide, amorphous nanostructure, oxygen vacancy, room temperature ferromagnetism

中图分类号: (Magnetic properties of nanostructures)

75.75.-c

75.75.Cd (Fabrication of magnetic nanostructures) 68.55.Ln (Defects and impurities: doping, implantation, distribution, concentration, etc.) 68.35.bj (Amorphous semiconductors, glasses)

谢谦, 王炜鹏, 谢拯, 战鹏, 李正操, 张政军. Room temperature ferromagnetism in un-doped amorphous HfO₂ nano-helix arrays[J]. 中国物理B, 2015, 24(5): 57503-057503.

Xie Qian (谢谦), Wang Wei-Peng (王炜鹏), Xie Zheng (谢拯), Zhan Peng (战鹏), Li Zheng-Cao (李正操), Zhang Zheng-Jun (张政军). Room temperature ferromagnetism in un-doped amorphous HfO₂ nano-helix arrays[J]. Chin. Phys. B, 2015, 24(5): 57503-057503.

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Room temperature ferromagnetism in un-doped amorphous HfO₂ nano-helix arrays

Room temperature ferromagnetism in un-doped amorphous HfO₂ nano-helix arrays

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