Room-temperature ferromagnetism in hydrogenated ZnO nanoparticles
Room-temperature ferromagnetism in hydrogenated ZnO nanoparticles
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DOI：
10.1063/1.4862306
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发表时间：
2014-01
影响因子：
3.2
通讯作者：
X. Xue;Liangliang Liu;Zhuo Wang;Yichu Wu
中科院分区：
文献类型：
--
作者：
X. Xue;Liangliang Liu;Zhuo Wang;Yichu Wu
研究了氢掺杂对ZnO纳米颗粒磁性的影响。通过在Ar环境中在5%H2下在700 ° C下退火来引入氢。氢化ZnO纳米颗粒中诱导出室温铁磁性，并且所观察到的铁磁性可以分别通过氢退火和氧退火过程在"开"和"关"状态之间切换。通过X射线光电子能谱和正电子湮没谱分析发现，Zn空位和OH键合复合物（VZn + OH）对所观察到的铁磁性是至关重要的。基于第一性原理计算，VZn + OH由于形成能较低而有利于出现。同时，这种构型可以导致0.57 μ B的磁矩。拉曼和光致发光测量排除了氧空位作为铁磁性起源的可能性。
The effect of hydrogen doping on the magnetic properties of ZnO nanoparticles was investigated. Hydrogen was incorporated by annealing under 5% H2 in Ar ambient at 700 °C. Room-temperature ferromagnetism was induced in hydrogenated ZnO nanoparticles, and the observed ferromagnetism could be switched between “on” and “off” states through hydrogen annealing and oxygen annealing process, respectively. It was found that Zn vacancy and OH bonding complex (VZn + OH) was crucial to the observed ferromagnetism by using the X-ray photoelectron spectroscopy and positron annihilation spectroscopy analysis. Based on first-principles calculations, VZn + OH was favorable to be presented due to the low formation energy. Meanwhile, this configuration could lead to a magnetic moment of 0.57 μB. The Raman and photoluminescence measurements excluded the possibility of oxygen vacancy as the origin of the ferromagnetism.