Coexistence of superparamagnetism and ferromagnetism in Co-doped ZnO nanocrystalline films
Coexistence of superparamagnetism and ferromagnetism in Co-doped ZnO nanocrystalline films
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共掺杂ZnO纳米晶薄膜中超顺磁性和铁磁性的共存
DOI：
10.1016/j.scriptamat.2013.08.007
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发表时间：
2013-11-01
影响因子：
6
通讯作者：
Ye, Bangjiao
中科院分区：
文献类型：
--
作者：
Li, Qiang;Wang, Yuyin;Ye, Bangjiao
采用脉冲激光沉积法在蓝宝石衬底上制备了纯ZnO和Zn0.95Co0.05O薄膜。证实了Co掺杂ZnO纳米晶薄膜的磁性是其本征性质。氧空位在Co-Co铁磁耦合中起着重要的中介作用。场冷却和零场冷却磁化的热不可逆性揭示了我们的薄膜中存在的超顺磁性行为，而没有证据表明金属Co簇。讨论了观测到的超顺磁性的起源。(C)2013 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Pure ZnO and Zn0.95Co0.05O films were deposited on sapphire substrates by pulsed-laser deposition. We confirm that the magnetic behavior is intrinsic property of Co-doped ZnO nanocrystalline films. Oxygen vacancies play an important mediation role in Co-Co ferromagnetic coupling. The thermal irreversibility of field-cooling and zero field-cooling magnetizations reveals the presence of superparamagnetic behavior in our films, while no evidence of metallic Co clusters was detected. The origin of the observed superparamagnetism is discussed. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.