Ferromagnetism in ZnCoO due to Hydrogen-Mediated Co鈥揌鈥揅o Complexes: How to Avoid the Formation of Co Metal Clusters?
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- 作者：Su Jae Kim ; Su Young Cha ; Ji Young Kim ; Jong Moon Shin ; Yong Chan Cho ; Seunghun Lee ; Won-Kyung Kim ; Se-Young Jeong ; Y. S. Yang ; Chae Ryong Cho ; H. W. Choi ; Myung-Hwa Jung ; Byeong-Eog Jun ; Ki-Yon Kwon ; Yoshihiro Kuroiwa ; Chikako Moriyoshi
- 刊名：The Journal of Physical Chemistry C
- 出版年：2012
- 出版时间：June 7, 2012
- 年：2012
- 卷：116
- 期：22
- 页码：12196-12202
- 全文大小：460K
- 年卷期：v.116,no.22(June 7, 2012)
- ISSN：1932-7455
文摘
There have been many studies of ferromagnetism in ZnCoO, and the results have been controversial. Secondary phases, such as Co oxides and Co metal clusters, in ZnCoO are easily produced during treatment, but the formation conditions are not well understood. We fabricated samples under hydrogen-injection conditions at different heat-treatment temperatures and examined the conditions by using synchrotron X-ray analysis under which Co3O4 appeared or was transformed into Co metal. We investigated the transforming process of the ferromagnetic origin from intrinsic to extrinsic nature via intermediate region competition by Co鈥揌鈥揅o and Co metal cluster and suggest conditions that induce ferromagnetic spin ordering in ZnCoO due to Co鈥揌鈥揅o complexes through hydrogen mediation.