Resistance-chiral anisotropy of chiral mesostructured half-metallic Fe3O4 films
Resistance-chiral anisotropy of chiral mesostructured half-metallic Fe3O4 films
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手性介观结构半金属 Fe3O4 薄膜的电阻手性各向异性
DOI：
10.1002/anie.202108142
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Che Shunai
中科院分区：
文献类型：
--
作者：
Bai Te;Ai Jing;Ma Jie;Duan Yingying;Han Lu;Jiang Jingang;Che Shunai
理论上预测半金属材料具有金属性和绝缘性，但尚未得到实验证实，该预测仍存在疑问。我们报告了使用氨基酸作为对称破坏剂通过水热法在基底上生长的手性介观结构 Fe3O4 薄膜（CMFF）中的电阻手性各向异性（R-ChA），即手性依赖性电导率。 CMFF 中存在两个水平的手性：晶格的初级变形形成扭曲的纳米薄片，纳米薄片的二次螺旋堆叠形成扇形纳米板。在低于 30 K 的温度下，CMFF 分别对一只手和另一只手表现出金属导电性和绝缘性。据推测，手性相关的有效磁场可以稳定对映手性框架中的相反自旋，从而导致电子在手性结构的一个手性中自由传输，而在另一手性中则无法移动。
Half‐metallic materials are theoretically predicted to be metallic and insulating, which have not been confirmed experimentally, and the predictions are still in doubt. We report the resistance‐chiral anisotropy (R‐ChA), i.e., chirality‐dependent electrical conductivity, in chiral mesostructured Fe3O4films (CMFFs) grown on the substrates via a hydrothermal method using amino acids as symmetry‐breaking agents. Two levels of chirality exist in the CMFFs: primary distortion of the crystal lattice forms twisted nanoflakes, and secondary helical stacking of nanoflakes forms fan‐shaped nanoplates. At temperatures below 30 K, the CMFFs exhibited metallic conductivity and insulation for one handedness and the other, respectively. The chirality‐dependent effective magnetic fields were speculated to stabilize the opposite spin in the antipodal chiral frame, which led to the free transport of electrons in one handedness of the chiral structure and immobility for the other handedness.