Fe implanted ferromagnetic ZnO
Fe implanted ferromagnetic ZnO
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DOI：
10.1063/1.2169912
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发表时间：
2005-12
期刊：
影响因子：
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通讯作者：
K. Potzger;S. Zhou;H. Reuther;A. Mucklich;F. Eichhorn;N. Schell;W. Skorupa;M. Helm;J. Fassbender-J.
中科院分区：
文献类型：
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作者：
K. Potzger;S. Zhou;H. Reuther;A. Mucklich;F. Eichhorn;N. Schell;W. Skorupa;M. Helm;J. Fassbender-J.
通过在ZnO单晶中注入铁离子，诱导出了室温下的铁磁性。用超导量子干涉装置（SQUID）磁强计对最初植入的4个样品进行了分析。结果表明，在5k和300k磁化反转时，只有HFHT和LFLT样品表现出明显的磁滞回线。通过同步x射线衍射、透射电镜和转换电子穆斯堡尔能谱分析（CEMS）发现，hfht样品的铁磁特性来源于平均直径为8 nm的微小α - fe纳米颗粒。在180 keV下，铁注入ZnO单晶可以产生由α -铁纳米粒子或DMS系统中铁离子的间接耦合引起的铁磁性能，这取决于离子影响和注入温度的细节。在任何情况下，为了排除二次相，都需要复杂的结构表征。
Room-temperature ferromagnetism has been induced within ZnO single crystals by implant-doping with Fe ions.The four samples implanted initially have been analyzed using SQUID (superconducting quantum interference device) magne-tometry. It was found that only two of them, i.e. the HFHT and the LFLT samples exhibit a pronounced hysteresis loop upon magnetization reversal at 5 K and 300 K. As was found using synchrotron X-ray diffraction, transmission electron microscopy and conversion electron Mossbauer spectroscopy (CEMS) the origin of the ferromagnetic properties of the HFHT-sample are tiny alpha-Fe-nanoparticles with a mean diameter of 8 nm. At 180 keV Fe implanted ZnO single crystals can develop ferromagnetic properties that are either caused by alpha-Fe nanoparticles or an indirect coupling of the Fe ions in a DMS system, depending on the details of ion fluence and implantation temperature. In any case sophisticated structural characterization is required in order to rule out secondary phases.