Magnetic anisotropy in the ferromagnetic Cu-doped ZnO nanoneedles

被引：108

作者：

Herng, T. S.

Lau, S. P.

Yu, S. F.

Yang, H. Y.

Wang, L.

Tanemura, M.

Chen, J. S.

机构：

[1] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore

[2] Nanyang Technol Univ, Sch Math & Phys Sci, Singapore 637616, Singapore

[3] Nagoya Inst Technol, Grad Sch Engn, Dept Environm Technol, Showa Ku, Nagoya, Aichi 4668555, Japan

[4] Data Storage Inst, Singapore 117608, Singapore

[5] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 119260, Singapore

来源：

APPLIED PHYSICS LETTERS | 2007年 / 90卷 / 03期

关键词：

D O I：

10.1063/1.2433028

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Copper-doped ZnO (ZnO:Cu) nanoneedles exhibiting room-temperature ferromagnetism were fabricated by an ion beam technique using Cu plate and ZnO film. A saturated magnetization moment of 0.698 emu/cm(3) was found in the nanoneedles when a field of 10 kOe was applied perpendicular to the substrate, which was 15% larger than the field applied parallel to the substrate. The magnetic ordering of the nanoneedles was enhanced significantly to 0.968 emu/cm(3) after annealing of 400 degrees C for 20 min. However, the magnetic anisotropy at high field is vanished but an "easy plane" ferromagnetism becomes apparent at low field region. The possible mechanisms of the magnetic ordering and anisotropy in the ZnO:Cu nanoneedles are discussed. (c) 2007 American Institute of Physics.

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