Evidence of Ferrimagnetism in Fe-Doped CdSe Quantum Dots
Evidence of Ferrimagnetism in Fe-Doped CdSe Quantum Dots
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DOI：
10.1021/acs.chemmater.8b02505
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发表时间：
2018-12-11
影响因子：
8.6
通讯作者：
Strouse, Geoffrey F.
中科院分区：
文献类型：
--
作者：
Bindra, Jasleen K.;Kurian, George;Strouse, Geoffrey F.
在5.1nm的Fe（4.6%）CdSe量子点中观察到两个相互作用的自旋亚晶格，产生了一种超顺磁性材料，其阻断温度接近90 K。场和温度依赖的Fe-57穆斯堡尔谱表明，所观察到的磁性产生从两个不同的，Fe（III）为基础的自旋晶格的反平行排列。密度泛函理论计算的实验数据的比较表明，形成一个有序的次要和主要的自旋晶格内的量子点（QD）可以归因于反位对形成的Fe（III）中心周围的镉空位。
Two interacting spin sublattices are observed for 5.1 nm Fe (4.6%) CdSe quantum dots giving rise to a superparamagnetic material with a blocking temperature of similar to 90 K. The field- and temperature-dependent Fe-57 Mossbauer spectra reveal that the observed magnetic properties arise from the antiparallel alignment of two dissimilar, Fe(III)-based spin-lattices. Comparison of the experimental data with density functional theory calculations suggests the formation of an ordered minor and major spin-lattice within the quantum dot (QD) can be ascribed to the antisite pair formation of the Fe(III) centers around a cadmium vacancy.