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Open Access Nano Express

Fabrication of ZnCoO nanowires and characterization of their magnetic properties

Bum-Su Kim1, Seunghun Lee2, Won-Kyung Kim1, Ji-Hun Park1, Yong Chan Cho3, Jungdae Kim4, Chae Ryong Cho5 and Se-Young Jeong1*

Author Affiliations

1 Department of Cogno-Mechatronics Engineering, Pusan National University, 1268-50, Samnangin-ro, Samnangjin-eup, Miryang 627-706, Republic of Korea

2 The Institute of Basic Science, Korea University, Seoul 136-713, Republic of Korea

3 Crystal Bank Institute, Pusan National University, 1268-50, Samnangin-ro, Samnangjin-eup, Miryang 627-706, Republic of Korea

4 Department of Physics, University of Ulsan, 93 Daehak-ro, Nam-gu, Ulsan 680-749, Republic of Korea

5 Department of Nano Fusion Technology, Pusan National University, Samnangin-ro 1268-50, Republic of Korea

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Nanoscale Research Letters 2014, 9:221  doi:10.1186/1556-276X-9-221

Published: 7 May 2014

Abstract

Hydrogen-treated ZnCoO shows magnetic behavior, which is related to the formation of Co-H-Co complexes. However, it is not well known how the complexes are connected to each other and with what directional behavior they are ordered. In this point of view, ZnCoO nanowire is an ideal system for the study of the magnetic anisotropy. ZnCoO nanowire was fabricated by trioctylamine solution method under different ambient gases. We found that the oxidation of trioctylamine plays an essential role on the synthesis of high-quality ZnCoO nanowires. The hydrogen injection to ZnCoO nanowires induced ferromagnetism with larger magnetization than ZnCoO powders, while becoming paramagnetic after vacuum heat treatment. Strong ferromagnetism of nanowires can be explained by the percolation of Co-H-Co complexes along the c-axis.

Keywords:
ZnCoO; Nanowire; Solution aqueous method; Ferromagnetism