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Dual Manipulation of Ferromagnetism in Co-Doped ZnO Thin Films by Surfactant and n-Type Carriers
Wei Che,Hui Su,Xu Zhao,Wei-ren Cheng,Qing-hua Liu*
Author NameAffiliationE-mail
Wei Che National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China  
Hui Su National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China  
Xu Zhao National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China  
Wei-ren Cheng National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China  
Qing-hua Liu* National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China qhliu@ustc.edu.cn 
Abstract:
We present a conceptually-new approach “dual manipulation effect” using the surfactant passivation and the electron carrier doping for mediating intrinsic ferromagnetism in Codoped ZnO dilute magnetic semiconductor (DMS) thin films. The first-principles calculations show that the surface passivation by hydrogen serves as a magnetism switch for the Co-O-Co magnetic coupling at the surface of the thin film, and thus can control the spin polarization of the doped Co atoms. Meanwhile, the electron carrier doping can further function as an effective layerlike ferromagnetism mediator for the underneath layer. The dual manipulation effect sheds light on the essential magnetism origin of n-type Co:ZnO DMS thin films, and may be used as an alternative strategy for enhancing the ferromagnetism in other n-type DMS oxides thin films.
Key words:  Surface passivation, Carriers doping, Ferromagnetism, Zinc oxide thin film
FundProject:
表面活性剂和n型载流子对钴掺杂氧化锌薄膜铁磁性的双重调控
车 伟,苏 徽,赵 旭,程位任,刘庆华*
摘要:
本文提出了一种利用表面活性剂钝化和电子载流子掺杂来调制钴掺杂氧化锌稀磁半导体薄膜固有铁磁性的“双重操纵效应”新方法. 第一性原理计算表明,氢表面钝化作为薄膜表面Co-O-Co磁耦合的磁开关,可以控制掺杂钴原子的自旋极化. 同时,电子载流子掺杂可以进一步用作类层状铁磁性媒介来调节薄膜内部原子层的铁磁性. 该双重操纵效应揭示了n型钴掺杂氧化锌稀磁半导体薄膜的本质铁磁性来源,并且还有可能用作其他n型稀磁半导体氧化物薄膜增强铁磁性的替代策略.
关键词:  表面钝化,载流子掺杂,铁磁性,氧化锌薄膜
DOI:10.1063/1674-0068/cjcp1810220
分类号: