Ultra-fast annealing manipulated spinodal nano-decomposition in Mn-implanted Ge

Ultra-fast annealing manipulated spinodal nano-decomposition in Mn-implanted Ge
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超快退火控制锰注入Ge中的旋节线纳米分解

DOI:
10.1088/1361-6528/aaefb1
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发表时间:
2018-11
期刊:
影响因子:
3.5
通讯作者:
Zhou Shengqiang
Zhou Shengqiang
中科院分区:
材料科学3区
文献类型:
--
作者:
Liu Chaoming;Hubner Rene;Xie Yufang;Wang Mao;Xu Chi;Jiang Zenan;Yuan Ye;Li Xingji;Yang Jianqun;Li Lingwei;Weschke Eugen;Prucnal Slawomir;Helm Manfred;Zhou Shengqiang

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在本工作中,毫秒范围内的闪光灯退火用于再结晶锰注入锗。通过系统的结构和磁性能的调查,我们发现,闪光灯退火产生的相混合物组成的调幅分解的富锰铁磁团簇内的顺磁性的矩阵与随机分布的锰原子。退火能量密度从46 J cm-2增加到50 J cm-2,导致Mn原子偏析成团簇,这一点通过透射电子显微镜分析得到证实,并通过磁化测量得到定量证实。根据X射线吸收光谱,Ge中的稀Mn离子处于d5电子构型。这种Mn掺杂的Ge显示顺磁性,证明了不饱和的磁场依赖的X射线磁性圆二色性信号。我们的研究揭示了调幅分解是如何发生的,并影响铁磁富锰Ge-Mn纳米团簇的形成。
In the present work, millisecond-range flash lamp annealing is used to recrystallize Mn-implanted Ge. Through systematic investigations of structural and magnetic properties, we find that the flash lamp annealing produces a phase mixture consisting of spinodally decomposed Mn-rich ferromagnetic clusters within a paramagnetic-like matrix with randomly distributed Mn atoms. Increasing the annealing energy density from 46, via 50, to 56 J cm−2 causes the segregation of Mn atoms into clusters, as proven by transmission electron microscopy analysis and quantitatively confirmed by magnetization measurements. According to x-ray absorption spectroscopy, the dilute Mn ions within Ge are in d5 electronic configuration. This Mn-doped Ge shows paramagnetism, as evidenced by the unsaturated magnetic-field-dependent x-ray magnetic circular dichroism signal. Our study reveals how spinodal decomposition occurs and influences the formation of ferromagnetic Mn-rich Ge–Mn nanoclusters.
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